Improving sensing performance of the ZnO foam structure with exposed {001} facets by hydrogenation and sensing mechanism at molecule level
Improving sensing performance of the ZnO foam structure with exposed {001} facets by hydrogenation and sensing mechanism at molecule level
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DOI：
10.1016/j.apsusc.2019.02.093
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发表时间：
2019-06
影响因子：
6.7
通讯作者：
Mengzhu Wang;Mengdi Chen;Yong Ma;Juan-Yu Yang;Yukun Yuan;Junfang Liu;B. Liu;Qinggang Du;
中科院分区：
文献类型：
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作者：
Mengzhu Wang;Mengdi Chen;Yong Ma;Juan-Yu Yang;Yukun Yuan;Junfang Liu;B. Liu;Qinggang Du;
通过加热Zn（NO3）2-聚乙烯吡咯烷酮混合溶液，成功地制备了由{001}晶面暴露的纳米片组装而成的ZnO泡沫结构。通过加氢增加ZnO（001）表面3-配位Zn（Zn 3c）原子的数量，可以显着增加ZnO泡沫结构对乙醇、丙酮和正丁胺的响应。不饱和Zn ~（3+）原子被认为是反应活性中心，它们有助于产生自由电子、吸附氧分子和催化目标气体与化学吸附氧的反应。该传感机理对理解气敏和多相催化反应以及设计高性能的传感材料和催化剂具有指导意义。氢化优化表面结构工程可能是提高传感和催化性能的一般策略。
The ZnO foam structure assembled from nanoflakes with exposed {001} facets has been successfully prepared by heating aqueous Zn(NO3)2-polyvinyl pyrrolidone mixed solution. Response of the ZnO foam structure towards ethanol, acetone and n-Butylamine was observably increased by increasing the amounts of 3-coordinated Zn (Zn3c) atoms on the ZnO (001) surface through hydrogenation. The unsaturated Zn3catoms are regarded as the reaction active sites and they contribute to generating free electrons, adsorbing oxygen molecules and catalyzing the reaction of the target gas with chemisorbed oxygen. The sensing mechanism will be instructive for the understanding of the gas sensing and heterogeneous catalytic reactions and the design of high performance sensing materials and catalysts. The hydrogenation optimizing surface-structural engineering may be a general strategy to enhancing sensing and catalytic properties.