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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.
The morphologies, chemical compositions and microstructures of semiconducting silver sulfide (Ag2S) nanostructures were successfully synthesized by a modified hydrothermal method. The results showed that the samples were spherical with smooth surface Structure.X-ray diffraction (XRD) / X-ray photoelectron spectroscopy (XRD / XPS) proved that the product has a monoclinic structure and high purity.Ultraviolet absorption spectra showed that the absorption peak of nanospheres was obviously (About 20nm). The surface photovoltage (SPV) technique was used to systematically study the room-temperature sensitivity of Ag2S nanospheres and traditional powder materials to ethanol gas. Under the same conditions, the detection limits of nanospheres can reach < 10mL / m3, while the latter only 50mL / m3.This exploration of the potential application of Ag2S gas sensing nanodevices.