丙酮
选择性
煅烧
材料科学
兴奋剂
催化作用
检出限
退火(玻璃)
乙醇
工作温度
分析化学(期刊)
化学工程
纳米技术
化学
色谱法
有机化学
光电子学
物理
工程类
复合材料
热力学
作者
Guanyu Yao,Wenjing Zou,Jun Yu,Huichao Zhu,Hao Wu,Zhengxing Huang,Wei Chen,Xiaogan Li,Hongxu Liu,Kai‐Rong Qin
标识
DOI:10.1016/j.snb.2023.135003
摘要
Ethanol and acetone sensors have a wide variety of applications across different industries. However, it is necessary to improve the performance of such sensors and to understand the underlying mechanisms. In this study, Pd/PdO-WO3 nanoblocks are synthesized via hydrothermal growth and calcination. The Pd and PdO contents of the materials are tuned by varying the Pd doping concentration and annealing temperature. The gas sensing performance of the nanoparticles is investigated, which shows that Pd doping increases the sensitivity and reduces the optimum operating temperature. At 200 °C, Pd/PdO-WO3 nanoblocks with different PdO ratios exhibit good sensitivity to acetone and ethanol. However, because PdO is an active catalyst for ethanol oxidation, the oxygen sensitivity increases as the PdO ratio increases. The prepared sensors exhibit good stability and excellent selectivity against a variety of interferents, and the detection limit of the target gas is 100 ppb. The chemical and electronic sensitization of Pd/PdO lowers the activation barrier and improves the gas sensing response. This study demonstrates that the selectivity of a gas sensor can be regulated by controlling the electronic states of the active species.
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