Graphene[2]
Overview
Graphene is a two-dimensional allotrope of carbon consisting of a single layer of atoms arranged in a hexagonal lattice. First isolated in 2004, it represents one of the strongest materials known while being extraordinarily lightweight and flexible. Its discovery earned the 2010 Nobel Prize in Physics. The material's unique combination of properties - including exceptional electrical and thermal conductivity, optical transparency, and mechanical strength - has made it a subject of intense research across multiple industries. Commercial production methods continue to evolve to meet growing industrial demand.
Physical and Chemical Properties
Graphene exhibits remarkable physical properties, including a tensile strength of 130 GPa (about 200 times stronger than steel) and exceptional thermal conductivity (~5000 W/m·K). Its electrical conductivity surpasses that of copper, with charge carriers behaving as massless relativistic particles. Chemically, graphene is relatively inert but can be functionalized for specific applications. The material demonstrates high surface area (2630 m²/g) and impermeability to gases. These properties vary based on the number of layers, defect density, and production method.
Main Applications
In electronics, graphene enables flexible, transparent conductive films for displays and touchscreens. Its high carrier mobility makes it promising for high-frequency transistors. Energy applications include advanced batteries, supercapacitors, and fuel cells where it enhances conductivity and surface area. Composite materials benefit from graphene's strength-to-weight ratio in aerospace and automotive sectors. Other uses include water filtration membranes, biomedical sensors, and anti-corrosion coatings. Emerging applications span from thermal management solutions to quantum computing components.
Safety and Storage
While bulk graphite is generally safe, graphene's nanoform requires special handling precautions. Inhalation of airborne particles may pose respiratory risks, necessitating proper ventilation and personal protective equipment during handling. Storage should maintain material purity, typically in sealed containers under inert gas to prevent oxidation. Bulk graphene powder is often stored in dry, temperature-controlled environments. Solution-based forms may require specific solvent conditions to prevent aggregation or degradation.
B2B Procurement Guide
Industrial buyers should specify critical parameters including layer number (single-layer vs. few-layer), lateral dimensions, purity level, and defect density. Production method (mechanical exfoliation, CVD, or chemical reduction) significantly affects properties and pricing. Quality verification typically involves Raman spectroscopy, atomic force microscopy, and XPS analysis. For large-scale procurement, consider suppliers with certified production processes and batch-to-batch consistency. Pricing varies dramatically based on quality, with research-grade material commanding premium prices compared to industrial-grade products.
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