Gas Sensors Based on Metal Sulfide Zn1鈥?i>xCdxS Nanowires with Excellent Performance

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• 作者：Linghui Zhu ; Ying Wang ; Dezhong Zhang ; Chao Li ; Dongming Sun ; Shanpeng Wen ; Yu Chen ; Shengping Ruan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 23, 2015
• 年：2015
• 卷：7
• 期：37
• 页码：20793-20800
• 全文大小：568K
• ISSN：1944-8252

文摘

Metal sulfide Zn_1鈥?i>xCd_xS nanowires (NWs) covering the entire compositional range prepared by one step solvothermal method were used to fabricate gas sensors. This is the first time for ternary metal sulfide nanostructures to be used in the field of gas sensing. Surprisingly, the sensors based on Zn_1鈥?i>xCd_xS nanowires were found to exhibit enhanced response to ethanol compared to those of binary CdS and ZnS NWs. Especially for the sensor based on the Zn_1鈥?i>xCd_xS (x = 0.4) NWs, a large sensor response (s = 12.8) and a quick rise time (2 s) and recovery time (1 s) were observed at 206 掳C toward 20 ppm ethanol, showing preferred selectivity. A dynamic equilibrium mechanism of oxygen molecules absorption process and carrier intensity change in the NWs was used to explain the higher response of Zn_1鈥?i>xCd_xS. The reason for the much quicker response and recovery speed of the Zn_1鈥?i>xCd_xS NWs than those of the binary ZnS NWs was also discussed. These results demonstrated that the growth of metal sulfide Zn_1鈥?i>xCd_xS nanostructures can be utilized to develop gas sensors with high performance.