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Gas Sensors Based on Metal Sulfide Zn1–xCdxS Nanowires with Excellent Performance

Zhu, Linghui, Wang, Ying, Zhang, Dezhong, Li, Chao, Sun, Dongming, Wen, Shanpeng, Chen, Yu, Ruan, Shengping
ACS Applied Materials & Interfaces 2015 v.7 no.37 pp. 20793-20800
absorption, ethanol, nanowires, oxygen, zinc sulfide
Metal sulfide Zn₁–ₓCdₓS 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 Zn₁–ₓCdₓS 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 Zn₁–ₓCdₓS (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 °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 Zn₁–ₓCdₓS. The reason for the much quicker response and recovery speed of the Zn₁–ₓCdₓS NWs than those of the binary ZnS NWs was also discussed. These results demonstrated that the growth of metal sulfide Zn₁–ₓCdₓS nanostructures can be utilized to develop gas sensors with high performance.