宏观长Ag2S纳米线簇的制备及其温度电导特性和光电导特性

以固态离子学方法制备的宏观长银(Ag)纳米线簇为基础,采用气-固反应法制备出宏观长硫化银(Ag₂S)纳米线簇.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能量色散谱(EDS)和X射线光电子能谱(XPS)等手段对样品形貌和成分进行表征.将厘米长的Ag₂S纳米线簇两端涂敷金胶作为电极,并与外电路连接.在不同温度或采用不同波长的光束辐照下,测试了样品的输运性质.无光照时,在144—380 K的温度范围内,样品的电导随温度上升而非线性增大.室温下,Ag关键词： 硫化银纳米线 温度电导 光电导

Fabrication, temperature-conductance and photoconductance characteristics of the macroscopic-long Ag2S nanowire bundle

According to the macroscopic-long Ag nanowire bundle which is prepared by the solid-state ionics method, we fabricate a macroscopic-long Ag₂S nanowire bundle using a gas-solid reaction. Their morphologies and components are characterized by the SEM, TEM, EDS and XPS. Au paints as electrodes are coated on both ends of a cm-long Ag₂S nanowire bundle and then connected to an external circuit. The transport properties of the Ag₂S nanowire bundle are studied at different temperatures or under the light irradiation of different wavelengths. Without light irradiation, as temperature T increases from 144 K to 380 K, the dark conductance increases nonlinearly with T. At room temperature, the significant positive photoconductivity induced by the 532 nm or 1064 nm laser is observed. These results demonstrate that Ag₂S nanowire is a kind of ideal material for making the nanoscale temperature and photoelectric sensors.