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溅射法制备Ag/Ag2O超微粒子的分析

李建 刘存业 梁一平 任洪湘 邓昭镜 刘昌信

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溅射法制备Ag/Ag2O超微粒子的分析

李建, 刘存业, 梁一平, 任洪湘, 邓昭镜, 刘昌信

ANALYSIS ON Ag/Ag2O ULTRAFINE PARTICLE PREPARED BY SPUTTERING

LI JIAN, LIU CUN-YE, LIANG YI-PING, REN HONG-XIANG, DENG ZHAO-JING, LIU CHANG-XIN
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  • 用X射线衍射、X射线光电子能谱、透射电子显微镜和差示扫描量热法对溅射法制备的Ag超微粒子的晶体学结构、表面组成、微粒形态和热力学性质进行了分析。结果表明,所制备的微粒为内部为Ag、表面为Ag2O的两相微粒,以及单一的Ag2O微粒,粒径在10nm以上的微粒没有确定的外形,粒径在10nm以下的微粒为球形。微粒有不同于块体金属Ag的异常热效应。到40天时,沉积在碳膜上的Ag,Ag2O两相微粒有一部份还原形成了单一的金属Ag超微粒子。
    The crystal phase, surface composition, particle shape and thermodynamic chaxacter of Ag ultrafine particle (UFP), which were prepared by sputtering in Ar gas, have been analysed by means of X-ray diffraction, X-ray photo-electron spectrum, transmission electron microscope (TEM) and differential scanning calorimeter. The results show that the particles with size larger than 4.6nm are composed of Ag-nuclens and Ag2O-surface-layer, the particles with size less than 4.6nm consisted of Ag2O only, the shape of particles with size less than 10nm are spherical and that with size larger than l0nm are non-definte when the particle were as-prepared. It is shown by DSC that there are different thermal effect between UFP and solid Ag. Also, it is shown by TEM that a few particles which had two phase of Ag and Ag2O and deposited on the carbon film have been reduced to metal Ag UFP after 40 days.
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出版历程
  • 收稿日期:  1993-12-02
  • 刊出日期:  1994-11-20

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