Hydrogenated Cu2O octahededrons with exposed {111} facets: Enhancing sensing performance and sensing mechanism of 1-coordinated Cu atom as a reactive center
Hydrogenated Cu2O octahededrons with exposed {111} facets: Enhancing sensing performance and sensing mechanism of 1-coordinated Cu atom as a reactive center
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具有暴露{111}面的氢化Cu2O八面体：增强1配位Cu原子作为反应中心的传感性能和传感机制
DOI：
10.1016/j.snb.2020.127827
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发表时间：
2020-05-01
影响因子：
8.4
通讯作者：
Yang, Heqing
中科院分区：
文献类型：
--
作者：
Chen, Mengdi;Wang, Yingfei;Yang, Heqing
通过氢化增加Cu2O八面体(111)面上1配位的Cu(Cu-1c)原子数目，Cu2O八面体结构对乙醇、丙酮、三乙胺和甲醛的敏感性显著提高。具有一个悬挂键的Cu-1C原子被认为是反应活性中心。活性中心具有三种功能：吸附氧、产生自由电子和催化吸附氧与被测气体之间的氧化还原反应。研究结果有助于加深对气敏机理的理解，为设计高性能气敏材料提供指导。此外，加氢表面工程策略也可用于提高其他材料的传感性能。
Sensitivity of the Cu2O octahedral structures towards ethanol, acetone, triethylamine and formaldehyde has been significantly enhanced by increasing the numbers of 1-coordinated Cu (Cu-1c) atoms on the (111) facet of Cu2O octahedrons through hydrogenation. The Cu-1c atom with one dangling bond is considered to be a reaction active center. The active center has three kinds of functions: adsorbing oxygen, creating free electrons and catalyzing the redox reaction between the adsorbed oxygen and the detected gas. The findings can deepen comprehending gas sensing mechanisms and give guidance to design high performance sensing material. In addition, the hydrogenation surface-engineering strategy can be employed to enhance sensing performances of other materials.