Overview
Graphene foam is a three-dimensional networked material synthesized through chemical vapor deposition (CVD) or freeze-drying methods, where graphene sheets form an open-cell structure. Unlike bulk graphene, its foam variant combines the intrinsic properties of graphene—such as high electron mobility and mechanical strength—with macro-scale porosity, enabling unique functionalities like elastic recovery under compression and fluid permeability. First developed in the early 2010s, this material addresses limitations of 2D graphene in practical applications by providing structural integrity while maintaining a high surface-to-volume ratio (up to 2,600 m²/g). Its tunable architecture allows customization for specific industrial needs, from energy storage to biomedical devices.
Physical and Chemical Properties
Graphene foam exhibits exceptional electrical conductivity (≈1,000 S/m) and thermal conductivity (≈500 W/m·K), outperforming traditional metallic foams. Its compressive strength ranges from 10 kPa to 1 MPa depending on density, with >90% recoverable strain after deformation. The material is chemically inert to most acids/bases except strong oxidizers. The foam’s pore size distribution (typically 100–500 µm) and strut thickness (nanometer-scale) directly influence its performance. For instance, smaller pores enhance surface area for electrochemical reactions, while thicker struts improve mechanical stability. Unlike polymer foams, it remains stable up to 400°C in air and 1,000°C in inert environments.
Main Applications
In energy storage, graphene foam serves as a current collector in Li-ion batteries and supercapacitors, increasing charge/discharge rates by 3–5x compared to conventional materials. Its porous structure accommodates volume changes during cycling, extending device lifespan. Thermal management systems utilize it as heat spreaders in electronics, achieving 20–30% better cooling efficiency than copper foams. Other uses include flexible pressure sensors (sensitivity >10 kPa⁻¹), EMI shielding composites (attenuation >60 dB at 1 mm thickness), and oil/water separation filters (flux >10,000 L/m²·h). Emerging biomedical applications exploit its biocompatibility for neural scaffolds and drug delivery matrices.
Safety and Storage
While graphene foam is non-toxic in its bulk form, airborne particles generated during cutting or sanding may pose inhalation risks. Workplace handling should follow NIOSH guidelines for nanomaterial dust (P100 respirators recommended). Static charge accumulation can occur; grounding is advised during transportation. Long-term storage requires moisture-proof packaging (vacuum-sealed bags with desiccants) to prevent oxidation of defective sites on graphene edges. For high-value conductive grades, argon-filled containers maintain performance. Shelf life exceeds 5 years under proper conditions.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with CVD production capabilities for consistent quality over solution-based methods. Key specifications include: resistivity (<0.1 Ω·cm for conductive grades), pore uniformity (±15% deviation), and ash content (<1% for pure samples). Bulk orders (1+ kg) typically reduce costs by 30–50%. Sample testing should evaluate compressive fatigue (≥10,000 cycles at 50% strain) and electrochemical stability (cyclic voltammetry in target electrolytes). Lead times range from 4 weeks (standard products) to 12 weeks (custom architectures). MOQs start at 10g for R&D quantities.
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