纳米Cu颗粒的制备及其微观结构

采用磁控溅射与液氮冷凝方法，在表面沉积有方华膜的电镜载网上制备支撑纳米Ｃｕ颗粒；对样品的微观结构进行了ＴＥＭ／ＥＤ观察。结果表明，用该方法制备的Ｃｕ颗粒呈球状，其尺寸基本服从正态分布。当Ｃｕ颗粒的直径为２ｎｍ时，其电子衍射花样为弥散环；当其直径大于８ｎｍ时，则一般表现出晶体结构。具有晶体结构的Ｃｕ颗粒晶格常数随其直径大小的不同，呈现出不同程度的收缩效应，与块状Ｃｕ材料相比，最大收缩量为５％。

PREPARATION AND MICROSTRUCTURE OF NANOMETER Cu PARTICLES

Supported Cu particles on Formvar foil are produced by using magnetron sputteringcombined with liquid nitrogen condensation technique. Specimens are investigated by TEM/ED. Resultsshowed that the size of as-prepared Cu particles obeys normal distribution. and Cu particles of 2nmin diameters are amorphous, and those being larger than sum in diameters are in crystalline. For Cuparticle being in crystalline, the lattice constant of each crystal plane tends to shrink with the variationof particles size, the largest shrinking value is 5% compared with bulk copper.