Graphene Dispersions

What Are Graphene Dispersions?

Graphene dispersions are liquid formulations containing graphene sheets or graphene-based materials distributed throughout a suitable solvent or liquid medium. They provide a practical starting point for research involving conductive coatings, printed electronics, polymer composites, sensors and energy storage devices.

Graphene consists of carbon atoms arranged in a two-dimensional hexagonal lattice. Its electrical, mechanical and thermal characteristics have attracted interest across numerous materials science applications. However, the performance of a graphene dispersion depends not only on the properties of the carbon material but also on particle dimensions, concentration, solvent compatibility, dispersion stability and subsequent processing.

Nanografi offers graphene water dispersions, graphene ethanol dispersions and graphene NMP dispersions, alongside aqueous graphene oxide (GO) and reduced graphene oxide (rGO) formulations. These materials have different surface chemistries and should be selected according to the intended application.

Available Graphene Dispersions from Nanografi

Nanografi's graphene dispersion portfolio includes several solvent systems and concentrations. The listed graphene products have a stated purity of 99.5%, with available concentrations ranging from 0.5 to 2.0 wt%.

Graphene Water Dispersions

Graphene water dispersions are aqueous formulations intended for research requiring graphene distributed in a water-based medium. Nanografi lists three concentrations:

• Graphene Water Dispersion, 0.5 wt% – SKU NG04EO0718
• Graphene Water Dispersion, 1.0 wt% – SKU NG04EO0716
• Graphene Water Dispersion, 2.0 wt% – SKU NG04EO0719

These products are described as black liquid dispersions with a listed graphene purity of 99.5%. They are relevant to aqueous coating development, conductive composites and laboratory formulation studies.

Water-based processing can be advantageous when compatibility with aqueous binders or other water-based formulation components is required. However, the presence of water does not establish compatibility with every polymer, substrate or deposition method.

Graphene Ethanol Dispersions

Graphene ethanol dispersions provide an alternative solvent system for coating and formulation research. Nanografi offers:

• Graphene Ethanol Dispersion, 0.5 wt% – SKU NG04EO0726
• Graphene Ethanol Dispersion, 1.0 wt% – SKU NG04EO0727
• Graphene Ethanol Dispersion, 2.0 wt% – SKU NG04EO0728

Ethanol-based formulations may be considered when a more volatile solvent or compatibility with selected coating processes is desirable.

Solvent evaporation can influence coating formation, particle redistribution and final film uniformity. Ethanol is flammable, so suitable handling, ventilation and ignition-source controls are required.

Graphene NMP Dispersions

Graphene NMP dispersions use N-Methyl-2-pyrrolidone as the liquid medium. Nanografi lists the following products:

• Graphene NMP Dispersion, 0.5 wt% – SKU NG04EO0720
• Graphene NMP Dispersion, 1.0 wt% – SKU NG04EO0721
• Graphene NMP Dispersion, 2.0 wt% – SKU NG04EO0725

NMP is used in various advanced-material and polymer-processing applications because of its solvent characteristics. Graphene dispersions in NMP may be investigated for composite preparation, coatings and electrode-related formulation development.

NMP requires appropriate occupational exposure controls and handling precautions. Its use should be evaluated against the relevant safety documentation, regulatory requirements and manufacturing constraints.

Graphene Oxide Water Dispersions

Graphene oxide (GO) contains oxygen-bearing functional groups that distinguish it chemically from less-oxidized graphene. These groups can increase interactions with water and other polar materials while disrupting the extended conjugated carbon network.

Nanografi offers:

• Graphene Oxide Water Dispersion, 0.8 wt% – SKU NG01GO0501
• Graphene Oxide Water Dispersion, 2.0 wt% – SKU NG04EO0717

Both products are described as dark brown liquid dispersions with a listed purity of 99.5%.

GO dispersions are investigated for membrane development, composite reinforcement, surface functionalization, coating research and preparation of reduced graphene oxide.

Graphene oxide should not be assumed to provide the same electrical conductivity as graphene because its oxygen-containing functional groups substantially influence electronic structure.

Reduced Graphene Oxide Water Dispersion

Reduced graphene oxide (rGO) is produced by partially removing oxygen-containing groups from graphene oxide. This process can restore portions of the conjugated carbon structure and improve electrical conductivity relative to the original GO material.

Nanografi lists Reduced Graphene Oxide Water Dispersion, 2.0 wt%, SKU NG04EO0729, with a stated purity of 99.5%.

Reduced graphene oxide is investigated for conductive coatings, electrochemical sensors, energy storage electrodes and composite materials.

The degree of reduction, residual oxygen content, structural defects and dispersion chemistry influence the final properties. rGO should not be considered structurally or electrically identical to pristine graphene.

Graphene vs. Graphene Oxide vs. Reduced Graphene Oxide

Understanding the differences between graphene, GO and rGO is essential when choosing a dispersion for an application.

Graphene

Graphene and graphene-rich materials are investigated when electrical conduction, thermal transport and mechanical reinforcement are important. Their comparatively hydrophobic carbon surfaces can make dispersion in certain liquids challenging without suitable formulation strategies.

Graphene Oxide (GO)

Graphene oxide contains oxygen-containing functional groups, which can support interactions with water, polar polymers and selected chemical species. Its electrical conductivity is generally substantially lower than that of less-oxidized graphene materials.

Reduced Graphene Oxide (rGO)

Reduced graphene oxide offers an intermediate materials platform: reduction can improve electrical properties compared with GO, while residual functional groups and defects continue to influence dispersion and surface chemistry.

Material selection: Graphene dispersions may be a starting point for conductive films and composites; GO may be more appropriate for oxygen-functionalized surfaces and membrane research; and rGO may be useful when a combination of conductivity and residual surface functionality is required.

The actual choice should be based on experimentally measured material characteristics and the intended processing environment.

How to Choose the Right Graphene Dispersion Solvent

The liquid medium influences graphene dispersion stability, processing compatibility, drying behavior and the properties of the resulting film or composite.

Water-Based Graphene Dispersions

Water-based systems are relevant to aqueous polymer formulations, selected coatings and laboratory processes designed around water-compatible ingredients.

Researchers should evaluate dispersion stability, surface tension, wetting behavior and compatibility with the intended binder system.

Ethanol-Based Graphene Dispersions

Ethanol-based systems may be considered for coating processes requiring different evaporation and wetting characteristics from water.

Drying conditions and substrate compatibility should be optimized to reduce defects, nonuniform particle distribution and adhesion problems.

NMP-Based Graphene Dispersions

NMP-based systems may be relevant to selected polymer-processing and electrode-formulation research. Their use requires attention to solvent removal, material compatibility and occupational safety.

Because NMP has a relatively high boiling point, drying and residual-solvent management can differ substantially from ethanol-based processing.

No single solvent is optimal for every graphene application. Solvent choice should be based on the complete formulation, deposition method and required final material properties.

Understanding Graphene Dispersion Concentration

Graphene dispersion concentration is an important parameter for formulation development. Nanografi lists graphene concentrations of 0.5, 1.0 and 2.0 wt% across its water, ethanol and NMP product groups.

Weight percentage describes the mass fraction of the specified dispersed material within the formulation.

For example, a nominal 1.0 wt% dispersion contains approximately 1 gram of the specified dispersed material per 100 grams of total dispersion, according to the product's concentration definition.

Concentration influences several properties:

• Solids loading: Determines the amount of graphene introduced into a formulation.
• Viscosity: May increase as particle concentration and interactions increase.
• Coating thickness: Influences the amount of material deposited during film formation.
• Dispersion stability: Can change with concentration, solvent and particle interactions.
• Composite formulation: Affects the final graphene loading within a polymer or other matrix.
• Electrical network formation: Influences particle connectivity after deposition or incorporation into a composite.

A higher graphene concentration does not automatically produce a more conductive, stable or mechanically stronger final material. Dispersion quality and processing conditions remain important.

Applications of Graphene Dispersions

Conductive Coatings and Thin Films

Graphene dispersions are investigated for producing electrically conductive or electrically functional coatings on compatible substrates.

After deposition and appropriate processing, graphene sheets may form interconnected networks that support charge transport through the film.

Potential applications include conductive surfaces, printed electrodes, electronic interfaces and selected functional coatings.

Film conductivity depends on sheet-to-sheet contact resistance, graphene structure, binder content, coating thickness and drying conditions.

Printed Electronics and Flexible Circuits

Graphene-based liquid formulations are investigated for printed electronic devices, including conductive patterns, sensors and flexible components.

Depending on formulation characteristics, graphene dispersions may be developed into materials suitable for screen printing, spray coating, inkjet printing or other deposition techniques.

However, a general graphene dispersion should not automatically be treated as an inkjet-ready ink. Printhead compatibility requires suitable viscosity, surface tension, particle-size distribution and dispersion stability.

For further information, read Nanografi's Printed Electronics: Materials and Applications.

Polymer Nanocomposites

Graphene dispersions can be incorporated into compatible polymer systems to investigate electrical, mechanical and thermal property modification.

Liquid formulations may help introduce graphene into selected polymer-processing routes, although uniform distribution within the final matrix is not guaranteed.

Important factors include graphene loading, surface chemistry, polymer compatibility, solvent removal and interfacial adhesion.

Mechanical reinforcement and conductivity improvements should be established through testing of the finished composite.

Barrier Coatings and Protective Layers

Graphene-based sheets are investigated in barrier coatings because their two-dimensional geometry can create tortuous pathways for the movement of gases or other permeating species.

Research applications include protective coatings, packaging-related materials and corrosion-barrier systems.

Barrier performance depends on sheet alignment, coating continuity, defects, dispersion and compatibility with the surrounding matrix.

Conductive graphene-containing coatings used on metals also require careful electrochemical evaluation, since poorly designed systems may create unfavorable galvanic interactions.

Electrochemical Sensors

Graphene, GO and rGO dispersions are investigated in the development of electrochemical sensing surfaces.

Their different electronic and surface properties can influence electrode behavior, interactions with analytes and the immobilization of functional components.

Sensor performance depends on electrode preparation, surface functionalization and the complete measurement system. Sensitivity and selectivity should be demonstrated experimentally.

Battery and Supercapacitor Research

Graphene-based materials are studied in batteries, supercapacitors and other electrochemical energy-storage devices.

Potential functions include conductive networks, supporting structures for active materials and components of experimental electrodes.

Graphene dispersions may be considered when developing custom electrode coatings or composite formulations, provided the solvent and other ingredients are compatible with the intended electrode manufacturing process.

Battery and supercapacitor performance should be evaluated through measurements such as electrical resistance, charge-discharge behavior, rate capability and cycling stability.

Thermal Management Materials

Graphene is investigated as a thermally functional filler in polymers, coatings and composite systems.

Dispersions may provide a route for incorporating graphene into compatible formulations, but the final thermal conductivity depends on filler loading, orientation, interfaces and the surrounding matrix.

The high intrinsic thermal conductivity associated with ideal graphene should not be interpreted as a guaranteed thermal conductivity for a commercial dispersion or its resulting composite.

Membranes and Separation Research

Graphene oxide dispersions are widely investigated in membrane and separation research because oxygen-containing functional groups can influence interactions with water and other chemical species.

GO-based layered structures may be studied for selective transport, filtration and functional membrane development.

Membrane performance depends on interlayer spacing, film integrity, surface chemistry, environmental conditions and the substances being separated.

How to Process Graphene Dispersions

Successful processing of graphene dispersions requires attention to particle distribution, solvent behavior and substrate compatibility.

General laboratory considerations include:

1. Review product documentation: Confirm solvent type, graphene concentration and relevant handling instructions.
2. Evaluate dispersion condition: Check for visible sedimentation, aggregation or other changes before use.
3. Prepare the substrate or matrix: Select materials compatible with the solvent and intended deposition method.
4. Choose a suitable deposition process: Evaluate coating, casting or printing methods according to viscosity, wetting and particle characteristics.
5. Control solvent removal: Establish drying conditions that are compatible with the substrate and complete formulation.
6. Characterize the final material: Measure the relevant electrical, mechanical, thermal or surface properties after processing.

Some dispersions may require product-specific mixing or redispersion procedures after storage. Excessive sonication or uncontrolled dilution may alter particle characteristics or dispersion stability.

Researchers should follow the supplier's technical guidance rather than assuming that every graphene dispersion requires the same preparation method.

Graphene Dispersion Stability and Aggregation

Graphene sheets can aggregate or restack because of interactions between their surfaces. This behavior can influence storage stability, coating uniformity and composite performance.

Dispersion stability depends on several factors:

• Solvent properties: Influence interactions between graphene and the surrounding liquid.
• Surface chemistry: Affects compatibility with polar or nonpolar media.
• Particle dimensions: Influence sedimentation, aggregation and flow behavior.
• Concentration: Affects particle interactions and rheology.
• Dispersants or stabilizers: May help maintain particle separation in suitable formulations.
• Storage conditions: Temperature, storage duration and handling can influence the dispersion state.

A graphene dispersion is not a molecular solution of dissolved graphene. It is a multiphase system in which solid graphene-based particles are distributed in a liquid medium.

Long-term stability should be evaluated under the intended storage and processing conditions rather than assumed from the initial appearance of the product.

Graphene Dispersions vs. Carbon Nanotube Dispersions

Graphene and carbon nanotube dispersions are both used in conductive material development, but the geometry of their carbon structures differs.

Graphene dispersions contain two-dimensional sheet-like structures that are investigated for thin films, barrier layers, coatings and composite reinforcement.

Carbon nanotube dispersions contain elongated, tubular structures capable of forming conductive networks through contacts between nanotubes.

Graphene may be useful when sheet coverage and barrier effects are important, while CNTs may be advantageous for certain percolating conductive networks and flexible composite systems.

The most suitable material depends on the intended electrical, mechanical and processing requirements.

Compare the options in Nanografi's Carbon Nanotube Dispersions category and read Graphene Dispersion vs. CNT Dispersion: Use Cases and How to Choose.

Graphene Dispersions vs. Graphene Powders

Graphene dispersions and dry graphene powders provide different starting points for material processing.

Graphene dispersions are supplied in a liquid medium and may reduce the need to develop a dispersion from dry powder before beginning certain experiments.

Graphene powders offer flexibility in selecting solvents, binders and solids loading, but often require additional dispersion development to achieve uniform particle distribution.

For dry graphene materials, explore Nanografi's Graphene Nanoplatelets category.

Selection should account for the intended processing method, solvent compatibility, final material composition and handling requirements.

How to Characterize Graphene Dispersions

Characterization is important for comparing graphene dispersion formulations and understanding the properties of the resulting materials.

• Raman Spectroscopy: Provides information about graphitic structure, defects and selected structural characteristics.
• Atomic Force Microscopy (AFM): Can be used to evaluate sheet thickness and lateral dimensions after appropriate sample preparation.
• Scanning Electron Microscopy (SEM): Helps examine deposited film morphology and particle distribution.
• Transmission Electron Microscopy (TEM): Can provide information about sheet morphology and structural characteristics.
• UV-Visible Spectroscopy: May support dispersion analysis and concentration-related measurements when properly calibrated.
• Zeta Potential Analysis: Can provide information about electrokinetic behavior in suitable liquid systems.
• Rheological Analysis: Evaluates viscosity and flow behavior under defined conditions.
• Four-Point Probe Measurement: Measures sheet resistance of suitable deposited conductive films.
• X-Ray Photoelectron Spectroscopy (XPS): Can help characterize surface chemistry and oxygen-containing functional groups.

The choice of characterization method depends on whether the research focuses on the liquid dispersion, graphene sheets, deposited coating or completed device.

Graphene Dispersion Research and Technical Resources

Graphene dispersions are investigated across printed electronics, energy storage, coatings, polymer composites and electrochemical sensing.

For further technical background, explore Nanografi's Solutions and Dispersions: Differences and Application Areas, which explains the distinction between solutions and dispersed materials.

For a comparison of graphene and carbon nanotube liquid formulations, read Graphene Dispersion vs. CNT Dispersion: Use Cases and How to Choose.

For printed electronic materials and device applications, explore Printed Electronics: Materials and Applications.

Researchers can also visit the Nanografi Publication Library for scientific publications and material-related research references.

Published results should be evaluated according to the specific graphene grade, solvent, concentration, processing conditions and characterization methods used in each study.

Buy Graphene Dispersions from Nanografi

Nanografi supplies graphene dispersions in water, ethanol and NMP, alongside graphene oxide and reduced graphene oxide water dispersions for laboratory research and advanced material development.

The portfolio includes graphene concentrations of 0.5, 1.0 and 2.0 wt%, graphene oxide water dispersions at 0.8 and 2.0 wt%, and reduced graphene oxide water dispersion at 2.0 wt%.

Browse the products listed on this page to compare material type, solvent system, concentration, available quantities and current pricing.

For additional liquid nanomaterials, explore Nanografi's Dispersions collection, including carbon nanotube, metallic and metal oxide dispersions.

Frequently Asked Questions About Graphene Dispersions

What is graphene dispersion?

Graphene dispersion is a liquid formulation in which graphene sheets or graphene-based particles are distributed throughout a suitable solvent or liquid medium. It is used in research involving coatings, composites, printed electronics and other functional materials.

What solvents are available for Nanografi graphene dispersions?

Nanografi offers graphene dispersions in water, ethanol and N-Methyl-2-pyrrolidone (NMP). The category also includes aqueous graphene oxide and reduced graphene oxide dispersions.

What concentrations of graphene dispersion are available?

Nanografi lists graphene water, ethanol and NMP dispersions at 0.5, 1.0 and 2.0 wt%. Graphene oxide water dispersions are listed at 0.8 and 2.0 wt%, while reduced graphene oxide water dispersion is listed at 2.0 wt%.

Is graphene dispersion electrically conductive?

Graphene-based dispersions may be used to produce conductive films or composites after suitable processing. Electrical conductivity depends on the graphene material, particle contacts, formulation and final film structure. The conductivity of the liquid dispersion should not be assumed from the intrinsic properties of graphene.

Is graphene soluble in water?

Graphene is not molecularly soluble in water under ordinary conditions. Suitable formulations can maintain graphene particles dispersed in an aqueous medium through appropriate surface chemistry and stabilization strategies.

What is the difference between graphene and graphene oxide dispersion?

Graphene oxide contains oxygen-containing functional groups that influence water compatibility, surface interactions and electrical behavior. Graphene dispersions contain less-oxidized graphene-based materials and may be more appropriate for certain conductive applications.

What is reduced graphene oxide dispersion used for?

Reduced graphene oxide dispersions are investigated for conductive coatings, electrochemical sensors, energy-storage electrodes and composite materials. Performance depends on the degree of reduction, residual oxygen groups and processing conditions.

Can graphene dispersions be used for printing?

Graphene dispersions can be investigated as starting materials for printable formulations. However, compatibility with screen printing, inkjet printing or other techniques requires suitable viscosity, surface tension, particle dimensions and dispersion stability.

How do I choose between water, ethanol and NMP graphene dispersions?

Choose according to substrate compatibility, polymer chemistry, coating or mixing process, solvent removal requirements and safety considerations. Each solvent has different processing characteristics, and no single option is suitable for every application.

Where can I buy graphene dispersions?

Nanografi offers graphene, graphene oxide and reduced graphene oxide dispersions through its online store. Researchers can compare available solvent systems, concentrations, technical specifications and purchasing options in the Graphene Dispersions category.