【摘要】 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Ａｇ＿２Ｏ的两相微粒，以及单一的Ａｇ＿２Ｏ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，Ａｇ＿２Ｏ两相微粒有一部份还原形成了单一的金属Ａｇ超微粒子。更多还原

【Abstract】 AbstractThe crystal phase, surface composition, particle shape and thermodynamic cha-racter 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.Thetesults show that the particles with size larger than 4.6nm are composed of Ag- nuc-leus and Ag₂O-surface-layer,the particles with size less than 4.6nm consisted ofAg₂O only,the shape of particles with size less than 10nm are spherical and thatwith size larger than 10nm are non-definte when the particle were as-prepared.Itis shown by DSC that there are differeiit thermal effect between UFP and solid Ag.Also,it is shown by TEM that a few particles which had two phase of Ag andAg₂O and deposited on the carbon film have been reduced to lnetal Ag UFP after40 days.更多还原