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以KBH4和维生素C(VC)为还原剂,以CuSO4·5H2O为原料,以EDTA为络合剂,PVP为分散剂,用液相还原法制备不同晶粒度的纳米铜粉。不同晶粒度的纳米铜粉同时在空气中放置1h后,进行XRD、DTA-TG以及TEM检测。结果表明:不同粒度的纳米铜粉在空气中抗氧化能力不同,晶粒度越大抗氧化能力越强。晶粒度大于75nm时在空气中放置1h不被氧化,平均晶粒度为75nm的纳米铜粉在120℃时开始氧化。纳米铜粉的熔点很低,进行TEM检测时,在电子束照射下颗粒熔融长大。
KBH4 and vitamin C (VC) as reductant, CuSO4 · 5H2O as raw material, EDTA as complexing agent and PVP as dispersant, using liquid-phase reduction method to prepare nano-copper powder with different grain sizes. The different grain size of nano-copper powder placed in air at the same time after 1h, XRD, DTA-TG and TEM detection. The results show that: different particle size of copper nanoparticles in the air antioxidant capacity is different, the greater the grain size, the stronger the anti-oxidation ability. When the grain size is greater than 75nm, it is oxidized in the air for 1h, and the average grain size of 75nm nano-copper powder begins to oxidize at 120 ℃. Nanocrystalline copper powder has a very low melting point. When subjected to TEM measurement, the particles melt and grow under electron beam irradiation.