Highly selective detection of dimethyl methylphosphonate (DMMP) using CuO nanoparticles /ZnO flowers heterojunction

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• 作者：Ran YooAuthor Vitae ; Somi YooAuthor Vitae ; Dongmei LeeAuthor Vitae ; Jeongmin KimAuthor Vitae ; Sungmee Cho ; ^{csmise@yonsei.ac.kr}Author Vitae ; Wooyoung Lee ; ^{wooyoung@yonsei.ac.kr}Author Vitae
• 关键词：CuO NPs/ZnO flowers ; Hydrothermal synthesis ; Dimethyl methylphosphonate (DMMP) gas ; Gas sensor
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：1099-1105
• 全文大小：2227 K
• 卷排序：240

文摘

Here we report the fabrication of high surface area CuO nanoparticles (NPs) on micron-scale ZnO (CuO/ZnO) “flowers” with dimethyl methylphosphonate (DMMP) gas sensing capabilities. The formation of CuO NPs/ZnO heterojunction structures was confirmed by PXRD and TEM analyses. The gas sensing properties of the CuO NPs/ZnO structures showed a faster response time (26.2 s) compared to the exclusively ZnO-based sensor (330 s). The heterojunction sensors demonstrated the highest selectivity in 10 ppm DMMP, reaching the high value of 626.21 at 350 °C. This CuO NPs/ZnO heterojunction structure provides an extension of the depletion layer and an increase of the resistance (Ra) in air, leading to a reduction of the depletion layer and resistance (Rg) when exposed to reducing DMMP gas. The higher surface area (6.0 m2/g) of the CuO/ZnO heterojunction structure with a 0.5 h synthesis time of the ZnO flowers further promoted the adsorption kinetics for the reaction between C3H9O3P and O2− when exposed to DMMP, thus enhancing its sensing properties.