【摘要】 氩气中溅射沉积在非晶碳膜基底上的银超微粒最初为内部是Ａｇ、表层是Ａｇ＿２Ｏ的Ａｇ／Ａｇ＿２Ｏ超微粒。对存放于自然环境中的样品，通过透射电子显微镜（ＴＥＭ）观察发现，２１天时物相结构未变，微粒仅出现团聚生长。在４０天时，一部份微粒的Ａｇ＿２Ｏ表层被还原，形成了纯金属Ａｇ超微粒，一部份微粒仍为Ａｇ／Ａｇ＿２Ｏ超微粒。这两种微粒出现分离富集现象。更多还原

【Abstract】 The Ag/Ag₂O ultrafine particles were firstly deposited on the amorphous carbon film by sputter- ing.The Ag was inside and the Ag₂O was outside. Natural evolution of the particles had not beenchanged but grown with particle aggregation before the 21th day,On the 40th day,Ag₂O surface ofsome particules reduced to form the pure Ag porticles, but the other particles were still the Ag/Ag₂O.The two types of particles were colesced apart in different area.更多还原