Electrochemical sensor to environmental pollutant of acetone based on Pd-loaded on mesoporous In2O3 architecture
Electrochemical sensor to environmental pollutant of acetone based on Pd-loaded on mesoporous In2O3 architecture
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DOI：
10.1016/j.snb.2019.03.139
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Xiaojing Liu;Kunrong Zhao;Xiaoli Sun;Xinping Duan;Chong Zhang;Xijin Xu
中科院分区：
文献类型：
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作者：
Xiaojing Liu;Kunrong Zhao;Xiaoli Sun;Xinping Duan;Chong Zhang;Xijin Xu
本文采用绿色易沉淀法制备了Pd负载量分别为1.0、1.5和2.0 mol%的Pd敏化介孔In2O3纳米复合材料，并与原始In2O3进行了气敏性能比较。对比传感性能试验结果表明，负载了1.5 mol% pd的in2o3气体传感器由于其特殊的多孔结构具有丰富的活性位点和较大的比表面积，对丙酮蒸汽的传感具有良好的灵敏度和选择性，在50 ppm时具有良好的响应（~ 82）和快速的响应（6 s）。由于钯金属充当电子受体，钯金属从铟金属中抽离电子导致载流子数量减少，钯金属与铟金属的接触形成肖特基结。因此，基线电阻在空气中为1.5 mol% Pd@In2O3sensor时大大增强，从而表现出超高的响应性。这项工作将为研究人员进一步开发n型传感器提供一些线索。
In this work, a series of Pd sensitized mesoporous In2O3nanocomposites with 1.0, 1.5 and 2.0 mol% Pd-loading amount were obtained by a green and facile precipitation method, and evaluated their gas sensing properties as compared to pristine In2O3. According to the results of comparative sensing performance tests, the gas sensor based on 1.5 mol% Pd-loaded In2O3displays prominent sensitivity and selectivity in sensing acetone vapor with superior response (˜82 with 50 ppm) and fast response (6 s), on account of the special porous structure possessing rich active sites and large surface area. The contact between Pd and In2O3form a Schottky junction since Pd metal act as electron acceptor, a withdrawal of electrons from In2O3by Pd metal lead to the decreased number of electron charge carriers. Therefore, the baseline resistance in air for 1.5 mol% Pd@In2O3sensor greatly enhanced, as a result it shows ultra-high response. This work will give some clue to the researchers for the further development of n-type based sensors.