From Planar Patterns to Self-Supporting Structures: The 3D Printing Formation Logic of High-Content Graphene Composite Inks

Introduction

In two-dimensional printed electronics, the main task of graphene ink is to be deposited onto a substrate surface to form lines, films, electrodes, or conductive patterns. Whether the pattern can be successfully formed mainly depends on whether the ink can spread stably, dry uniformly, and form continuous conductive pathways after post-treatment.

Three-dimensional printing of graphene inks faces a different set of problems. The ink cannot merely spread over a substrate; it must form fibers, grids, scaffolds, porous structures, or complex components in space. After leaving the nozzle, if the ink cannot rapidly retain its shape, it may collapse, flow, or block pores. If it is too difficult to flow, problems such as discontinuous extrusion, nozzle clogging, or fiber breakage may occur.

The core task of a 3D-printable graphene ink can be summarized as follows: it is not simply to spread graphene into a conductive film, but to organize graphene sheets into a three-dimensional conductive structure that is extrudable, shape-retaining, self-supporting, and compatible with post-treatment.

This article focuses on high-content graphene composite inks whose shape setting is driven by solvent evaporation. Different 3D graphene printing routes may use graphene oxide slurries, hydrogels, composite gels, or other systems. Therefore, the specific viscosity, composition, annealing temperature, and washing method discussed here should not be directly extrapolated to all 3D graphene inks.

1. Fundamental differences between two-dimensional deposition and three-dimensional forming

The difference between two-dimensional graphene inks and three-dimensional graphene inks is not merely a difference in viscosity, but a difference in material task.

Comparison item	Two-dimensional graphene ink	Three-dimensional graphene ink
Main objective	Form conductive patterns on a substrate	Form self-supporting structures in space
Support mode	Supported by the substrate	Supported by the material itself
Deposition behavior	Spreading, merging, drying into a film	Extrusion, shape setting, layer-by-layer stacking
Structural form	Lines, films, electrodes, planar patterns	Fibers, grids, scaffolds, tubular or bulk structures
Curing or shape-setting requirement	Can dry gradually after deposition	Must acquire shape-retention ability relatively quickly after deposition
Key properties	Line width, film thickness, conductivity, bending stability	Extrudability, self-supporting ability, conductivity, softness, processability
Main risks	Line breakage, coffee-ring effect, nonuniform film thickness, high resistance	Collapse, nozzle clogging, interlayer separation, structural deformation, embrittlement after post-treatment

For two-dimensional structures, once a controllable pattern is formed on the substrate surface, the material can usually proceed to drying, annealing, and testing. Three-dimensional structures are different. From the first layer onward, they must perform a mechanical function. The lower layers must support the upper layers, the fibers must maintain pores and shape, and the entire structure must withstand handling, washing, annealing, and testing.

2. Why is a 3D graphene ink not simply a thickened version of a 2D ink?

Simply thickening a two-dimensional graphene ink does not automatically produce a 3D-printable ink. Increasing viscosity can indeed reduce flow, but it also introduces new experimental problems: higher extrusion pressure, greater nozzle-clogging risk, discontinuous material output, fluctuations in fiber diameter, and weaker interlayer bonding. What 3D printing requires is not simply a “thicker” ink, but an ink that maintains an appropriate state inside the nozzle, outside the nozzle, and during multilayer stacking.

Change after thickening	Possible result	Effect on 3D printing
Increased flow resistance	Higher pressure is required for extrusion	Unstable output and increased equipment load
Increased solid content or polymer content	Increased nozzle-clogging risk	Greater difficulty when printing through small-diameter nozzles
Mismatch among shear thinning, structural recovery, and solvent evaporation rate	Unstable output, filament breakage, spreading, or collapse	Lines are more likely to break or become uneven in thickness
Increased local aggregation	Fluctuations in line diameter and more structural defects	Weak points are more likely to appear in multilayer structures
Insufficient interlayer wetting	Weaker bonding between layers	The structure is prone to delamination and unstable interlayer conduction
Easier drying at the nozzle tip	Printing interruption or filament breakage	This is especially important for rapidly evaporating solvent systems

A true 3D graphene ink must satisfy several capabilities at the same time:

1. Flow inside the nozzle: it must be continuously and stably extruded under pressure.

2. Shape retention after leaving the nozzle: the fiber should not show obvious spreading, flowing, or collapse.

3. Load-bearing during multilayer stacking: the lower layers must support the upper layers, and the porous structure should not be compressed and destroyed.

4. Integrity during post-treatment: after washing, drying, and low-temperature annealing, the structure should not show obvious fracture, embrittlement, or delamination.

5. Functional stability during use: after bending, compression, or changes in the contact environment, the conductive pathways should still be maintained.

This is the essential difference between 3D graphene inks and 2D inkjet graphene inks: two-dimensional inks emphasize depositability and film formation, whereas three-dimensional inks emphasize extrudability, shape retention, and self-supporting capability.

3. What are typical 3D-printable graphene inks composed of?

Taking the high-content graphene/polymer composite 3D-printing ink reported by Jakus and co-workers and described in technical materials as an example, the ink is a medium-viscosity graphene suspension with a viscosity of approximately 25–35 Pa·s. It can be extruded under ambient conditions through nozzles of approximately 50–2000 μm. After printing, the material consists of approximately 60 vol% graphene and 40 vol% elastomeric polymer binder phase. In the literature system, the polymer is a biocompatible polymer belonging to the poly(lactic-co-glycolic acid) class.

This type of ink is not a simple graphene dispersion. It is jointly composed of graphene sheets, an elastomeric polymer binder phase, and a rapidly evaporating solvent system.

Component	Main function	Issues that need attention in experiments
Graphene sheets	Provide conductive pathways and serve as the main functional phase; affect sheet orientation, interfacial contact, and electrical performance	If the content is too low, the conductive network is insufficient; if the content is too high, extrusion becomes difficult and the risks of aggregation and embrittlement increase
Elastomeric polymer binder phase	Connect graphene sheets and improve structural integrity, softness, and processability	It can improve shape formation and handling, but limits heat resistance; excessive content may reduce conductivity
Rapidly evaporating solvent system	Before printing, enables graphene and polymer to form an extrudable ink; after printing, promotes rapid shape setting through evaporation	Evaporation that is too fast increases drying at the nozzle tip; residual solvent needs to be removed by washing; solvent compatibility with containers, fixtures, and substrates must be considered

The role of graphene in a 3D ink is not merely that of a “conductive filler.” High graphene content helps form a continuous conductive network and also affects sheet alignment during extrusion and the surface characteristics of the structure. However, as graphene content increases, ink processability also becomes more difficult. Without an appropriate polymer binder phase, high-graphene-content structures may become brittle, fragile, or difficult to handle.

The function of the polymer binder phase is to connect graphene sheets into a continuous macroscopic structure, giving the printed structure softness, integrity, and post-processing capability. It should be noted that making the material easier to handle does not mean that it has strong elastic recovery. Relevant literature describes this type of 3D-printed graphene structure as having obvious plasticity, meaning that plastic deformation may occur under force.

The solvent system performs two tasks: before printing, it allows graphene and polymer to form an extrudable ink; after printing, rapid evaporation promotes structural shape setting. The term “curing” here mainly refers to physical shape setting caused by solvent evaporation and polymer precipitation. It should not be understood as thermal curing, photocuring, or resin crosslinking.

4. Extrusion, shape setting, and stacking: key processes in 3D structure formation

3D graphene inks are usually extruded through a syringe or nozzle. This process is not simply a matter of pushing the material out; it requires the ink to show different states at different stages.

Stage	Required ink state	Main failure modes	Key control factors
Extrusion inside the nozzle	Continuous flow under pressure	Discontinuous output, filament breakage, nozzle clogging	Viscosity, solid content, aggregates, nozzle diameter, extrusion pressure
Shape setting after deposition	Rapid retention of the line shape after leaving the nozzle	Fiber spreading, collapse, pore shrinkage, blurred boundaries	Solvent evaporation rate, polymer precipitation rate, ambient temperature, line spacing
Multilayer stacking	Lower layers support upper layers while maintaining interlayer contact	Delamination, sliding, unstable interlayer conduction	Layer spacing, printing speed, fiber contact area, shape-setting rate
Post-treatment stage	Structure remains intact after washing and low-temperature annealing	Embrittlement, cracking, dimensional change, resistance fluctuation	Washing intensity, drying method, annealing temperature, polymer heat resistance

Inside the nozzle, the ink must flow continuously under pressure. If the viscosity is too high, there are too many aggregates, the nozzle diameter is too small, or the solvent evaporates too quickly at the nozzle tip, clogging and filament breakage are likely to occur.

After leaving the nozzle, the ink cannot continue to behave like an ordinary liquid. It must rapidly retain the fiber shape so that the line diameter, pores, and interlayer positions remain as close as possible to the design values. During multilayer stacking, interlayer bonding must also be appropriate: if bonding is too weak, delamination may occur; if flow is too strong, pores may be compressed and the structure may deform.

Rapid shape setting is especially important for three-dimensional structures. It is not simply “drying the ink,” but transforming the material quickly from a flowable state into a state capable of supporting subsequent layers. Technical articles have noted that rapid drying after deposition usually causes an approximately 10% reduction in fiber diameter. For example, ink extruded from a 100 μm nozzle may ultimately form a fiber with a diameter of approximately 90 μm.

This shrinkage affects structural design:

1. The nozzle diameter is not equal to the final fiber diameter.

2. Line spacing affects the actual pore size.

3. Layer spacing affects contact between upper and lower layers.

4. Scaffold pore size may deviate from the design value.

5. Electrode cross-sectional area and resistance also change with dimensional variation.

Rapid shape setting also increases operational difficulty. Because the solvent evaporates quickly, the ink should not be exposed to an open environment for a long time. Even if dried ink is redispersed with dichloromethane, it is more likely to cause nozzle clogging. Before washing, this type of ink should also avoid contact with materials that are incompatible with dichloromethane and may be dissolved, swollen, or attacked by it, such as polystyrene and low-density polyethylene.

5. Why should printed structures not be evaluated only by conductivity?

A 3D graphene structure is both a “conductive material” and a “structural material.” It should not be evaluated only by electrical conductivity, nor only by whether it has formed a shape. Conductivity, softness, processability, and mechanical stability should all be assessed.

5.1 Conductivity: continuous current pathways must form inside the 3D structure

The conductivity of a 3D graphene structure comes from high graphene content and contact between sheets. Relevant technical articles have reported that this 3D-printed graphene structure has an as-printed conductivity of more than 650 S/m, which can increase to more than 870 S/m after annealing in air at 50 °C for approximately 30 minutes.

When evaluating conductivity, different structural levels should be distinguished:

Test object	What to evaluate
Single fiber	Whether the extruded line itself is conductive
Multilayer grid	Whether continuous electrical connection forms between layers
Large-size structure	Whether resistance is uniform across different regions
Washed structure	Whether conductivity is maintained after solvent removal
Deformed structure	Whether bending or compression disrupts conductive pathways

5.2 Softness: deformable, but not a high-strength load-bearing material

Relevant literature shows that this type of 3D-printed graphene structure can withstand more than 80% strain before fracture, while its yield strength and ultimate tensile strength are both below 1 MPa. Overall, it is relatively soft and has characteristics of processability and plasticity.

Suitable positioning	Reason
Soft conductive component	It can be bent and deformed, making it suitable for non-rigid structures
Post-processable scaffold	It can be cut, curled, folded, or fused
Bioelectronic interface material	Softness and conductivity can be combined for interface studies
Soft sensing structure	Deformation can alter conductive pathways and resistance

Unsuitable positioning	Reason
High-strength load-bearing material	Tensile strength is low
High-temperature structural material	The heat resistance of the polymer matrix is limited
Rigid precision component	The material is soft and may undergo plastic deformation

5.3 Mechanical stability: the structure must withstand subsequent handling

Three-dimensional structures usually undergo handling, transfer, washing, drying, annealing, and testing. Maintaining shape only on the printing stage is not sufficient. In practical evaluation, the following should be observed at the same time:

1. Whether individual fibers are continuous.

2. Whether multilayer structures collapse or delaminate.

3. Whether morphology is maintained after compression or bending.

4. Whether dimensions change significantly before and after washing.

5. Whether embrittlement or cracking appears before and after annealing.

6. Whether resistance remains stable before and after deformation.

6. What application scenarios are suitable for 3D graphene structures?

The value of 3D graphene structures comes from two features: they are conductive, and they can be designed into three-dimensional shapes. Different application directions focus on different aspects.

Application direction	Value brought by the 3D structure	Key points to verify
Flexible electronics	Can form non-planar conductive frameworks, porous electrodes, and deformable interconnect structures	Resistance change after bending, interlayer conduction stability, cyclic deformation reliability
Bioelectronic interfaces	Conductivity, deformability, and designed porosity can be combined	Residual solvent, sterilization compatibility, long-term stability, cytocompatibility
Tissue-engineering scaffolds	Can be printed into porous structures with potential for conductivity and cell support	Pore size, mechanical matching, long-term in vivo response, batch consistency
Soft sensors	Compression, bending, or stretching can change sheet contact and conductive pathways	Sensitivity, hysteresis, response time, cyclic stability, structural recovery ability

6.1 Flexible electronics

3D graphene structures can be used as conductive frameworks, deformable interconnect structures, and non-planar electrodes in flexible electronics. Compared with planar conductive patterns, 3D structures allow conductive pathways and interfacial area to be adjusted through pores, line diameter, number of layers, and geometry.

6.2 Bioelectronics

3D graphene structures combine conductivity, softness, and designable porosity, making them suitable for exploring bioelectronic interfaces, such as conductive scaffolds, electrical stimulation platforms, neural-related interfaces, and tissue-engineering auxiliary structures. Before cell experiments or animal experiments, residual solvent, adequate washing, sterilization method, long-term stability, and specific biocompatibility must be carefully confirmed. Conductivity is only one indicator and cannot replace validation of biosafety and experimental reproducibility.

6.3 Tissue-engineering scaffolds

After washing to remove residual solvent, 3D-printed graphene structures are mainly composed of graphene sheets and a biocompatible elastomeric polymer. In vitro experiments have shown that human bone-marrow-derived mesenchymal stem cells can survive and proliferate on the material and show neural-like and glial-like gene expression as well as morphological changes. Short-term mouse subcutaneous models have shown that after implantation for 7 and 30 days, tissue can integrate with the scaffold and vascularization can occur, with no obvious signs of significant immune response observed.

These results support the potential of 3D-printed graphene structures in tissue-engineering research, but they should not be directly equated with long-term implant safety or mature clinical materials. Further applications still require validation of residual solvent content, long-term in vivo response, sterilization compatibility, batch consistency, and scaffold mechanical matching.

6.4 Soft sensors

When 3D graphene structures are compressed, bent, or stretched, sheet contact and conductive pathways may change, making them suitable for exploring soft sensors. Soft sensors should not pursue high conductivity alone; sensitivity, hysteresis, cyclic stability, response time, and structural recovery ability should also be considered. For 3D graphene structures with obvious plasticity, it is especially necessary to evaluate whether the signal drifts after repeated deformation.

7. What should be considered during post-treatment, washing, and annealing?

The post-treatment of 3D graphene structures differs from the annealing methods used for two-dimensional graphene films. Two-dimensional conductive patterns often use relatively high-temperature annealing to remove stabilizers or improve sheet contact. In contrast, the 3D graphene structures discussed in this article contain a relatively high proportion of polymer matrix, and excessively high temperatures can damage softness and processability.

Post-treatment step	Main function	Issues requiring attention
Room-temperature drying	Further remove volatile solvent and stabilize structural morphology	Avoid uneven drying that causes dimensional and resistance fluctuations
Washing with 70% ethanol	Remove residual solvent and reduce interference in subsequent biological experiments	Insufficient washing affects experimental reliability; overly aggressive washing may damage fine structures
Low-temperature annealing at 50 °C	Can improve the conductivity of this system, possibly related to reduced residual solvent, changes in the polymer phase state, and improved sheet contact	Resistance, dimensions, morphology, and softness should be recorded before and after annealing
Heat treatment at 150 °C or above	For this type of polymer-matrix-containing 3D graphene structure, heat treatment at 150 °C or above is not suitable as a routine post-treatment condition	The polymer matrix may decompose and the material may become brittle

During post-treatment, the following should be recorded at the same time:

1. Whether resistance or conductivity improves.

2. Whether fiber diameter and overall dimensions change.

3. Whether cracks, collapse, or delamination appear in the microscopic morphology.

4. Whether softness decreases.

5. Whether interlayer conduction remains continuous.

6. When used in biological experiments, whether washing and sterilization change the material surface and conductivity.

8. What should be confirmed before conducting 3D graphene printing experiments?

Before the experiment, the structural target, printing parameters, post-treatment method, and performance testing method should be clearly defined.

Confirmation direction	Questions that need to be clarified in advance	Direct impact
Structural target	Whether the printed object is a line, grid, sheet, or scaffold; whether pores or channels are required; whether multilayer stacking is needed	Determines path design, line spacing, layer spacing, and structural dimensions
Printing parameters	Nozzle diameter, extrusion pressure, printing speed, layer spacing, ambient temperature, exposure time	Affects fiber line diameter, clogging risk, pore retention, and interlayer contact
Post-treatment conditions	Washing method, drying method, annealing temperature, solvent compatibility, sterilization method	Affects residual solvent, structural integrity, conductivity, and reliability in biological experiments
Performance testing	Single-fiber diameter, multilayer morphology, conductivity, bending or compression response, mass and dimensions before and after washing, resistance before and after annealing	Determines forming quality, conductive function, mechanical stability, and post-treatment effect

When designing experiments, it is advisable to start with small-size, low-layer-number structures. First confirm whether the ink can be extruded stably, whether the lines can retain their shape, and whether interlayer connections are continuous. Then gradually increase the number of layers, area, and structural complexity. For bioelectronic or tissue-engineering directions, washing, sterilization, residual solvent, and cell-experiment controls should be included in the early-stage design rather than added only after printing has been completed.

9. Product Selection Navigation for 3D-Printable Graphene Inks

Research or experimental objective	Recommended table to consult first	Why start with this table	Recommended tables to consult together	Selection guidance
Directly conduct forming experiments with 3D-printable graphene ink	Table 1	Table 1 includes 3D-printing graphene ink and preformed 3D graphene structures, allowing the experimenter to first determine whether to start from a ready-to-use ink or evaluate the properties of existing 3D structural samples	Table 6, Table 3	First confirm whether the objective is extrusion printing, structural characterization, conductivity testing, or evaluation of flexible porous structures; then decide whether solvents, polymer binder phases, or slurry formulation materials are needed
Compare the forming differences between 2D printing inks and 3D extrusion inks	Table 2	Table 2 focuses on spin coating, spray coating, inkjet printing, screen printing, and gravure printing systems, making it suitable for illustrating the difference between 2D deposition and 3D self-supporting formation	Table 1	Comparisons can be made around spreading, film formation, line width, annealing, conductivity, and the shape setting, stacking, and support capability after 3D extrusion
Develop graphene ink formulations or study slurry dispersion	Table 3	Table 3 covers aqueous, organic-solvent-based, alcohol-based, and graphene/carbon nanotube composite slurries, making it suitable for studying the effects of solvent system, solid content, dispersant, and sheet-to-sheet contact on ink performance	Table 5, Table 6	First determine whether the formulation focus is dispersion stability, conductive network formation, evaporation rate, or extrusion forming, and then select the corresponding slurry, sheet raw material, and auxiliary materials
Study aqueous graphene gels, graphene oxide forming, or reduction-based conductivity routes	Table 4	Table 4 includes graphene oxide gels, aqueous graphene oxide dispersions, and aqueous reduced graphene oxide dispersions, making it suitable for research on aqueous systems, gel formation, and conductive structures after reduction	Table 3, Table 5	Suitable for research directions focusing on aqueous dispersion, gelation, sheet assembly, subsequent reduction, and pretreatment before biology-related experiments
Build conductive networks starting from graphene sheet raw materials	Table 5	Table 5 focuses on highly conductive powders, graphene with a high single-layer ratio, large-diameter few-layer graphene, and high-specific-surface-area nanoplatelets, making it suitable for evaluating the effects of sheet size, thickness, and specific surface area on conductive networks	Table 3	Raw materials can be screened around sheet-to-sheet contact, conductive pathways, fillers for composite slurries, and conductive continuity in 3D structures
Study self-supporting ability, flexibility, porosity, and compression response of 3D structures	Table 1	Table 1 includes structural products such as graphene paper, graphene aerogel, graphene foam, and nickel foam graphene, directly corresponding to self-supporting, porous, deformable conductive structures	Table 5	Sheet raw materials and preformed structures can be combined to compare pore structure, bending, compression, resistance change, and structural stability
Evaluate how post-treatment affects the conductivity and integrity of 3D-printed structures	Table 6	Table 6 includes rapidly evaporating solvents and degradable polymer binder phases, making it suitable for understanding solvent evaporation, redispersion, binder selection, and post-treatment stability	Table 1, Table 3	Experimental design can focus on nozzle-tip drying, solvent evaporation, polymer binding, washing treatment, low-temperature drying, and shape retention
Develop conductive scaffolds for bioelectronics or tissue engineering	Table 1	The 3D graphene, porous aerogel, foam structures, and self-supporting sheets in Table 1 can be used for research on conductive scaffolds, flexible interfaces, and porous structures	Table 4, Table 6	Conductivity, residual solvent, washing treatment, polymer binder phase, pretreatment before biological experiments, and structural integrity should all be considered
Build conductive structures for flexible electronics or soft sensing	Table 1	The flexible porous graphene structures, self-supporting graphene paper, and 3D conductive support materials in Table 1 are suitable for studies on deformation response, bending, and compression-related conductivity	Table 2, Table 5	2D printed conductive patterns can be compared with 3D porous conductive structures to observe resistance changes and cyclic stability under different structural forms
Compare the effects of different solvent systems on graphene ink processability	Table 3	Table 3 covers aqueous, organic-solvent-based, and alcohol-based slurries, which can be used to compare dispersion state, drying rate, film-forming behavior, and conductive-layer formation	Table 6	Rapidly evaporating solvents and polymer binder phases can be consulted together to evaluate solvent evaporation, nozzle stability, and post-treatment compatibility
Gradually expand from ready-to-use inks to self-formulated ink systems	Table 1	Table 1 can first establish an intuitive understanding of 3D-printed structures and clarify evaluation indicators for forming, support, conductivity, and post-treatment	Table 3, Table 5, Table 6	First use ready-to-use 3D-printing graphene ink to establish evaluation methods, and then introduce slurries, sheet raw materials, solvents, and polymer binder phases for formulation development as needed
Quickly identify products highly relevant to the theme of this article	Table 1	Table 1 directly corresponds to 3D printing, self-supporting structures, and porous conductive structures, making it suitable as the entry point for reading the product tables	Table 6	If the experiment involves formulation, redispersion, binder phase, or post-treatment, consult Table 6 for supplementary auxiliary materials

Table 1 | 3D-Printing Graphene Ink and Structural Graphene Reference Materials

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Ready-to-use 3D-printing graphene ink	—	D487607	3D printing graphene ink	—	Used for extrusion-based 3D printing of graphene structures; suitable for studies on output continuity, interlayer stacking, self-supporting formation, and post-treatment conductivity
3D graphene structural material	—	G494572	3D graphene	—	Used for studies on 3D conductive structures, porous structures, and bulk graphene materials; can serve as a reference for evaluating the morphology and performance of printed structures
Self-supporting sheet-like graphene structure	—	S494562	Self supporting graphene paper	—	Has a self-supporting sheet form; can be used to compare handling, cutting, bending, and conductive continuity with 3D-printed structures
Highly elastic porous graphene structure	—	H497445	Highly elastic graphene aerogel (graphene foam)	—	Suitable for research on flexible porous conductive structures, compression response, and soft sensing
Ultralight porous graphene structure	—	U498182	Ultralight graphene aerogel	—	Used for research on lightweight porous graphene frameworks, pore structures, and low-density conductive materials
Carbon nanotube composite porous graphene structure	—	C498195	CNT doped graphene aerogel	—	Builds a composite conductive network through sheet-like graphene and one-dimensional carbon nanotubes; suitable for studies on porous conductive pathways and structural stability
Foam-metal-supported graphene structure	—	N494532	Nickel Foam Graphene	Thickness: 1–1.2 mm	Uses foam metal as a 3D support framework; suitable for studies on conductive scaffolds, electrode interfaces, and 3D graphene-supported structures

Table 2 | Reference Products for 2D Printing, Coating, and Photonic Annealing Graphene Inks

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Spin-/spray-coating graphene ink	—	G485796	Graphene ink for spin/spray coating photonically annealable	For spin coating, spray coating, and photonic annealing	Used for planar coating, spray film formation, and photonic annealing studies; can be compared with 3D extrusion-forming inks in terms of deposition mode
Inkjet-printing graphene ink	—	G485279	Graphene ink	Suitable for inkjet printing; compatible with optical annealing	Used for 2D inkjet-printed conductive patterns and low-temperature annealing studies; can be used to compare the forming differences between inkjet deposition and 3D extrusion printing
Screen-printing graphene ink	—	G485792	Graphene ink	For screen printing; contains ethyl cellulose and terpineol; screen-printable	Used for preparing planar screen-printed conductive layers; can serve as a reference sample for high-viscosity planar printing systems
Gravure-printing graphene ink	—	G485653	Graphene ink	For gravure printing; contains ethyl cellulose and terpineol; gravure-printable	Used for gravure patterned printing and continuous coating studies; can be compared with 3D self-supporting inks in terms of application boundaries
Aqueous inkjet graphene ink	—	G477895	Graphene ink in water	Inkjet printing	Aqueous inkjet-printing system; can be used for low-viscosity planar pattern preparation and studies on aqueous graphene dispersion stability
High-solid-content graphene ink	—	G485891	Graphene	Ink, 40% solid content, 100 g, viscosity 5.5 Pa·s	Has defined solid content and viscosity information; can be used for studies on ink rheology and the matching relationship between solid content and printing method

Table 3 | Graphene Slurries, Dispersions, and Products for Ink Formulation Development

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Graphene slurry in dimethylformamide	—	G494546	Graphene DMF slurry	≥98%, thickness: 0.55–3.74 nm; diameter: 0.5–3 μm; number of layers: <10	Used for polar organic dispersion systems and graphene sheet dispersion studies; can support ink formulation, film formation, and conductive network construction experiments
Graphene slurry in N-methylpyrrolidone	7782-42-5	G139801	Graphene NMP Paste	Graphene content: 1–1.5 wt%; dispersant content: 0.2–0.3 wt%	Used for formulation studies of organic-solvent-based graphene slurries; can be used to examine the relationship among dispersant content, solid content, and conductive-layer formation
Graphene slurry in ethanol	—	G494548	Graphene ethanol slurry	≥98%, thickness: 0.55–3.74 nm; diameter: 0.5–3 μm; number of layers: <10	Suitable for studies on volatile alcohol-based dispersion systems; can be used for rapid drying, low-temperature film formation, and graphene sheet dispersion experiments
Aqueous graphene slurry	7782-42-5	G139800	Graphene Aqueous Paste	Graphene content: 1–1.5 wt%; dispersant content: 0.2–0.3 wt%	Used for aqueous graphene formulations and conductive slurry studies; can support aqueous printing, coating, and exploration of biology-related materials
High-solid-content industrial-grade aqueous graphene nanoplatelet slurry	7782-42-5	G492369	Industrial Graphite Nanoplatelet Aqueous	Industrial-grade graphene nanoplatelet content: 5 wt%; dispersant content: 0.15 wt%	Has relatively high graphene sheet content; can be used for aqueous high-solid-content conductive slurries, sheet-to-sheet contact, and coating resistance studies
Graphene/carbon nanotube composite aqueous slurry	7782-42-5	G139808	Graphite Nanoplatelet Carbon Nanotubes Aqueous Paste	GNP and CNT content: 1–5 wt%; GNP:CNT = 1:1; dispersant content: 0.2–1.0 wt%	Combines sheet-like graphene with one-dimensional carbon nanotubes; can be used for studies on composite conductive networks, low-loading conductive pathways, and flexible conductive coatings

Table 4 | Graphene Oxide, Reduced Graphene Oxide, and Aqueous Gel Route Products

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Graphene oxide gel system	7782-42-5	G139812	Graphene Oxide Gel	Graphene oxide content: 1–3 wt%	Used for studies on aqueous gels, 3D forming, and conductive structures after reduction; can serve as a representative material for graphene oxide printing routes
High-concentration aqueous graphene oxide dispersion	—	G405797	Graphene Oxide	10 mg/mL, aqueous dispersion	Suitable for studies on aqueous graphene oxide dispersion, coating, gelation, and subsequent reduction to conductive structures
Buffer-stabilized graphene oxide dispersion	—	G475662	Graphene oxide	pH-stable, dispersed in 0.05 M HEPES buffer, pH 7.5	Suitable for studies on graphene dispersion in a near-neutral buffered environment; can be used for preliminary material evaluation in bioelectronic interfaces and cell-related studies
High-single-layer-ratio graphene oxide solution	7782-42-5	I489798	Industrial-grade graphene oxide solution	Single-layer ratio >95%, 0.8–1.2 nm	Has defined single-layer ratio and thickness information; can be used for graphene oxide sheet dispersion, thin-layer assembly, and reduced conductive network studies
Aqueous reduced graphene oxide dispersion	—	R485644	Reduced graphene oxide	10 mg/mL, dispersed in H₂O	Used for studies on aqueous reduced graphene oxide conductive dispersion systems; can be used to examine the relationship between water-dispersed conductive sheets and conductive pathways in 3D structures

Table 5 | Representative Products for Conductive Network Construction and Graphene Sheet Raw Materials

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Highly conductive graphene powder	1034343-98-0	G476622	Graphene	Powder, conductivity >10³ S/m	Has defined conductivity information; can be used for conductive fillers, sheet-to-sheet contact, and graphene conductive network construction studies
High-single-layer-ratio graphene raw material	7782-42-5	S491698	Graphene	Single-layer ratio >99.8%, thickness 0.8–1.2 nm, diameter 0.8–3 μm	High single-layer ratio and defined thickness information; can be used for studies on thin-sheet graphene dispersion, conductive pathways, and interfacial contact
Large-diameter few-layer graphene raw material	7782-42-5	H494522	High purity graphene	≥98%, thickness 1–3 nm, scale >50 μm, layers <3	Relatively large sheet diameter and few-layer structure; can be used to study sheet-to-sheet contact, conductive continuity, and structural stability of composite inks
High-specific-surface-area graphene nanoplatelets	7782-42-5	G434035	Graphene nanoplatelets	Surface area: 750 m²/g	High-specific-surface-area sheet material; can be used for porous structures, interfacial contact, conductive fillers, and composite slurry development

Table 6 | Auxiliary Materials Related to Formulation and Post-Treatment of 3D-Printable Graphene Inks

Category	CAS No.	Aladdin Catalog No.	Name	Specification or Purity	Product Features and Applications
Rapidly evaporating solvent and ink-redispersion-related reagent	75-09-2	D1522471	Dichloromethane	Electronic grade, UPS, ≥99.5%	Can be used for dissolving polymer binder phases in 3D graphene composite inks, ink redispersion, and solvent compatibility studies; can also be used to evaluate the effects of rapid evaporation, nozzle-tip drying, redispersion after drying, and compatibility with plastic consumables on extrusion printing
Degradable polymer binder phase	26780-50-7	P134566	Poly(D,L-lactide-co-glycolide) (PLGA)	Lactide:glycolide = 50:50, mol wt 30,000–60,000	Can serve as a candidate degradable polymer binder phase in graphene composite inks; useful for studying graphene sheet connection, 3D structural integrity, flexibility, post-treatment morphology retention, and scaffold formation for biomaterials. Its specific applicability should be verified based on molecular weight, lactide/glycolide ratio, end groups, solvent solubility, film-forming flexibility, and mechanical performance after printing

Note: The above products are representative Aladdin products. More product specifications can be searched on the Aladdin website by product name, CAS number, or catalog number.

References

[1] Jakus A. E., Secor E. B., Rutz A. L., Jordan S. W., Hersam M. C., Shah R. N. Three-Dimensional Printing of High-Content Graphene Scaffolds for Electronic and Biomedical Applications. ACS Nano, 2015, 9(4): 4636–4648. DOI: 10.1021/acsnano.5b01179.

[2] Jakus A. E., Shah R. N. 3D Printing Graphene Ink: Creating Electronic and Biomedical Structures and Devices. Material Matters, 2016, 11(2).

[3] Lewis J. A. Direct Ink Writing of 3D Functional Materials. Advanced Functional Materials, 2006, 16(17): 2193–2204. DOI: 10.1002/adfm.200600434.

[4] Jakus A. E., Rutz A. L., Shah R. N. Advancing the Field of 3D Biomaterial Printing. Biomedical Materials, 2016, 11(1): 014102. DOI: 10.1088/1748-6041/11/1/014102.

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Application of Graphene in Photocatalysis

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Panorama Guide to Graphene Materials: Bulk Graphene × GO/rGO Precursors × Functionalization & Doping × Dispersions/Inks and Composite Devices (with a Selection Roadmap)