以KBH4和维生素C(VC)为还原荆,以CuSO4·5H2O为原料,以EDTA为络合荆,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1 h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75 nm时在空气中放置1 h不被氧化,平均晶粒度为75 nm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.“,”Taken KBH4 and vitamin C (VC) as reducers, CuSO4· 5H2O as a raw material, EDTA as a complex agent and polyvinyl-pyrolidone (PVP) as a protector, the copper nano-powders were prepared by the liquid reduction method. Placed the powders with different grain sizes in air for an hour, the powders were then examined by XRD, DTA-TG and TEM. The results reveal that the anti-oxidizing ability of the copper nano-powders depends on their grain sizes. When the grain size of the copper nano-powder is bigger, the anti-oxidizing ability is better. If the granularity of the powder is bigger than 75 nm, the powder will not be easily oxidized in air.The 75 nm copper nano-powder samples begin to be oxidized at 120 ℃. The melting point of the copper nano-powder is very low, so the grain will melt and grow up quickly under the TEM elec-tron beam.