Overview
Copper nanoparticles (flake) are ultra-fine copper particles with a distinctive flake-like morphology, typically ranging from 50–500 nm in thickness and several micrometers in lateral dimensions. Their high surface-to-volume ratio and excellent electrical conductivity make them valuable in advanced industrial applications. Unlike spherical nanoparticles, flake-shaped particles exhibit anisotropic properties, enabling unique performance in conductive pastes and coatings. They are synthesized via chemical reduction, mechanical milling, or electrochemical methods, often requiring surface stabilization to prevent oxidation.
Physical and Chemical Properties
Flake-shaped copper nanoparticles retain the intrinsic properties of bulk copper, including high thermal and electrical conductivity. However, their nano-scale dimensions and morphology enhance reactivity and surface plasmon resonance effects. Due to their large surface area, they oxidize readily in air, forming a copper oxide layer. This can be mitigated by surface passivation with organic coatings or storage under inert gas. Their flake shape provides better interparticle contact in conductive composites compared to spherical particles.
Main Applications
In electronics, these particles are used in conductive inks for printed circuit boards and flexible electronics, where their shape facilitates low-temperature sintering. They also serve as catalysts in chemical reactions, such as CO2 reduction or organic synthesis. Antimicrobial coatings leverage copper's natural biocidal properties, with flakes offering prolonged release. Additional uses include electromagnetic shielding, solar cell electrodes, and reinforcement in conductive polymers.
Safety and Storage
As a fine powder, copper nanoparticles pose dust explosion hazards and require handling in explosion-proof environments. Inhalation risks necessitate respiratory protection and proper ventilation. Storage demands airtight containers under inert gas (e.g., argon) to prevent oxidation. Bulk quantities should be kept in cool, dry areas, segregated from acids and oxidizers. Disposal must comply with local regulations for heavy metals.
B2B Procurement Guide
Key procurement criteria include purity (≥99%), particle size distribution (verified via SEM/DLS), and surface treatment (e.g., oleic acid coating). Suppliers should provide material safety data sheets (MSDS) and oxidation stability data. For conductive inks, evaluate sintering temperature compatibility. Bulk orders (10+ kg) may reduce costs by 10–20%. Sample testing is recommended to assess dispersion stability in target formulations.
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