Preparation of needle shaped nano-copper by microwave-assisted water system and study on its application of enhanced epoxy resin coating electrical conductivity

Needle shaped nano-copper 90 nm in length and 3 nm in diameter was synthesized in microwave-assisted water system in which copper acetate, ascorbic acid and surfactant made by us are used as precursor, reductant, and modifiers, respectively. The as-prepared nano-copper was characterized by XRD, TEM and TG-DSC. The epoxy resin coating exhibited a better excellent electrical conductivity added to as-prepared needle shaped nano-copper, ρV = 3.4 × 10−6 Ω m than that of the coating added to sphere nano-copper, ρV = 8.9 × 10−6 Ω m.