Graphene

When purchasing graphene, you must distinguish between Single-layer Graphene, Few-layer Graphene (FLG), and Graphene Nanoplatelets (GNP). Key metrics include the Lateral Size (D50), which affects conductivity, and the Specific Surface Area (SSA), typically measured via BET analysis. For high-end electronics, prioritize CVD-grown graphene on copper foils with a high Carbon-to-Oxygen (C/O) ratio to ensure minimal structural defects.

Request a Raman Spectroscopy report; the ratio of the D, G, and 2D peaks is the 'fingerprint' that confirms the number of layers and defect density. Additionally, ask for Transmission Electron Microscopy (TEM) or Atomic Force Microscopy (AFM) images to verify thickness. Ensure the supplier complies with ISO/TS 80004-13 standards for nanotechnology terminology and characterization.

The application determines the form: Graphene Powder is ideal for reinforcing polymers or battery electrodes (LFP/NCM batteries); Graphene Dispersions (Slurry) are preferred for conductive coatings and inks to avoid particle agglomeration; and Graphene Films are used for thermal management in smartphones or transparent conductive electrodes. Always match the functionalization (e.g., -OH, -COOH groups) to your specific solvent or matrix for better compatibility.

Graphene is classified as a chemical substance, so a comprehensive Safety Data Sheet (SDS/MSDS) is mandatory. In the EU, ensure the supplier is REACH compliant. For US markets, check TSCA (Toxic Substances Control Act) status. Because fine powders pose inhalation risks, verify that the supplier uses vacuum-sealed, anti-static packaging to prevent environmental contamination and ensure handler safety.

The market is flooded with high-surface-area graphite labeled as graphene. To protect your investment, utilize third-party inspection services like SGS or Intertek to perform independent Raman testing before final payment. On Made-in-China.com, prioritize Audited Suppliers who have undergone on-site factory verifications to ensure they possess the actual production capacity rather than being mere traders.

Graphene powder is extremely light and can be highly flammable or explosive if dispersed in air. It is often classified under Dangerous Goods (DG) Class 4.1 or 9 depending on the form. Ensure your freight forwarder is experienced in handling hazardous chemical logistics and that all containers are UN-certified. For liquid dispersions, ensure temperature-controlled shipping if the stabilizer is sensitive to freezing.

Graphene pricing is highly volume-sensitive. For R&D, expect high unit prices for gram-scale orders. For industrial scale, negotiate based on annual volume commitments rather than one-off spot buys. Ask for tiered pricing (e.g., 1kg, 10kg, 100kg) and request a pre-shipment sample from the same batch that will be used for the bulk order to ensure consistency.

Use Trade Assurance or Escrow services provided by platforms like Made-in-China.com to ensure funds are only released upon proof of shipping and compliance with quality documents. Avoid direct wire transfers to unverified accounts. Clearly define Incoterms (e.g., DAP or CIF) in the contract to establish exactly where the risk transfers, especially given the sensitive nature of nanomaterial handling.