中文摘要：

通过改良的水热方法,成功合成了形貌规则的半导体硫化银（Ag2S）纳米结构,并对样品的形貌、化学成分和微观结构进行了详细的表征.结果发现,样品为表面光滑的球状结构.X-射线衍射仪/光电子谱仪（XRD/XPS）证明,产物具有单斜结构且纯度很高.通过紫外可见吸收光谱发现,与传统粉体材料相比,纳米球吸收峰有明显的蓝移（约20nm）.运用表面光电压（surface photovoltage,SPV）技术系统地研究了Ag2S纳米球及传统粉体材料对乙醇气体的室温敏感特性,在同样条件下,纳米球的检测限可达〈10mL/m3,而后者仅为50mL/m3.这为Ag2S气敏纳米器件的潜在应用进行了一些探索.

英文摘要：

Silver sulfide （Ag2S） nanospheres （NSs） were fabricated by a modified hydrothermal strategy. The obtained products were characterized by powder X-ray diffraction, photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and UV-vis absorption techniques. The highly pure Ag2S NSs possessed a monoclinic structure, smooth surface, and their optical absorption spectra exhibited a blue shift of 20 nm compared with that of bulk Ag2S. The gas sensing properties of Ag2S NSs and conventional powders （CPs） at room temperature （RT） were investigated using the surface photovoltage （SPV） technique. The Ag2S NSs exhibited novel photoelectric gas sensitivity to ethanol gas and a RT gas sensor containing the as-fabricated NSs operated below 10 mL/m3, while that containing CPs had a limit of about 50 mL/m3 under the same conditions. These results reveal a new potential application for Ag2S nanodevices at room temperature.