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采用真空蒸发沉积法和辉光放电氧化法,制备了粒径在5～30nm之间的可控、空间分布均匀、高纯度的氧化银纳米薄膜,使薄膜成岛状生长和避免光照是制备过程中的两个关键问题.用XPS分析了Ag3d和O1s轨道的结合能,计算了银和氧的原子比,证明其成分为Ag2O,用XRD确定了氧化银纳米薄膜最强的衍射峰分别对应Ag2O的(111)、(110)、(200)、(211)晶面族.研究了这种薄膜在可见光波段的光吸收,计算得氧化银的禁带宽度为2.8eV.在蓝光持续照射几分钟激活后,观察到了其中纳米粒子在蓝光激发下发黄光和绿光,在绿光激发下发红光的现象,这种光致发光具有动态“闪烁”的特点.提出了氧化银光分解引入缺陷能级(如Ag3O,Ag+2O和Ag+3O)新的理论模型并对此现象进行定性的解释.
A controlled, spatially uniform and highly pure silver oxide nano-film with particle size of 5 ~ 30nm was prepared by vacuum evaporation deposition and glow discharge oxidation, which made the film grow into island shape and avoid the light irradiation XPS were used to analyze the binding energies of Ag3d and O1s orbital. The atomic ratio of silver to oxygen was calculated and its composition was confirmed to be Ag2O. The strongest diffraction peaks of silver oxide nanostructured films were confirmed by XRD. The (111), (110), (200) and (211) crystal families were studied.The absorption of the film in the visible light band was studied and the band gap of silver oxide was calculated to be 2.8 eV. After activation, the nanoparticles were observed to emit yellow and green light under the excitation of blue light and red light under the excitation of green light, and the photoluminescence had the characteristics of dynamic “flashing.” The introduction of photolysis of silver oxide Defective energy level (such as Ag3O, Ag + 2O and Ag + 3O) new theoretical model and qualitative interpretation of this phenomenon.