Cu纳米粉的制备及其导电性能研究

Preparation and Electrical Conductivity of Cu Nanopowders

用电弧放电法在H2＋Ar混合气氛下同时制备了气相稳定和液相稳定的Cu纳米粉，并用Cu纳米粉配制了导电浆料。用XRD，TEM，DSC-TG，化学分析等手段研究了粉体的相结构、表面组成、形貌、粒度和氧化特性。结果表明：气相稳定和液相稳定的Cu纳米颗粒具有壳核结构，核为纳米Cu，壳分别为氧化层和松油醇（C10H18O）分子层；粉体的平均粒度分别为80nm和70nm；在空气中，包覆在Cu纳米粒子表面的松油醇分子在190℃左右基本脱附和分解；Cu纳米粉导电浆料在烧结温度180～200℃、保温时间60～70min、真空度1133Pa条件下可获得电阻率为（2．12-5．82）×10^-4Ω·cm的导电膜。

Cu nanopowder with gas and liquid phase stabilizing were prepared by arc discharging in H2＋ Ar atmosphere. The phase structure, surface layer, morphology particle size and oxidation resistance of the particles were studied using X-ray diffraction （XRD）, transmission electron microscopy （TEM）, infrared spectrum analysis, chemical analysis, gas analysis, differential thermal and thermogravimetry analysis. The results show that Cu nanoparticles stabilized by gas phase process and liquid phase precess have different core-shell structure, their cores are the same, composed of nanosized Cu, while their shells are different, structed by oxide layer or terpineol molecules （C10H18O） layer. The average particle sizes are 80 nm and 70 nm, respectively. The terpineol molecules of nanoparticle surface was disabsorbed and decomposed at about 190 ℃ in air. A thick film formed at the Cu nanopowders conductive paste sintered at 180-200 ℃ for 60-70 min under 1.33 Pa, and the resistivity of the film is （2.12-5.82）×10^-4Ω·cm.