Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Laboratory for Advanced Energy Technology, Key Laboratory of Macromolecular Science of Shaanxi Province, School of Materials Science and Engineering, Shaanxi Normal University , Xi'an, 710119, China.
Langmuir. 2017 Sep 5;33(35):8671-8678. doi: 10.1021/acs.langmuir.7b00455. Epub 2017 Aug 3.
Network structures assembled from α-FeO nanosheets with exposed {104} facets were successfully prepared by heating Fe(NO) solution containing polyvinylpyrrolidone (PVP) in air. The α-FeO nanosheet-based network structures demonstrate significantly higher response to ethanol and triethylamine than α-FeO commercial powders. The excellent sensing performances can be ascribed to the exposed (104) facet terminated with Fe atoms. A concept of the unsaturated Fe atoms serving as the sensing reaction active sites is thus proposed, and the sensing reaction mechanism is described at the atomic and molecular level for the first time in detail. The concept of the surface metal atoms with dangling bonds serving as active sites can deepen understanding of the sensing and other catalytic reaction mechanisms and provides new insight into the design and fabrication of highly efficient sensing materials, catalysts, and photoelectronic devices.
通过在空气中加热含有聚乙烯吡咯烷酮（PVP）的 Fe(NO3)3 溶液，成功制备了具有暴露的 {104} 面的α-FeO 纳米片组装的网络结构。基于α-FeO 纳米片的网络结构对乙醇和三乙胺的响应明显高于α-FeO 商业粉末。优异的传感性能可归因于终止于 Fe 原子的暴露的（104）面。因此，提出了不饱和 Fe 原子作为传感反应活性中心的概念，并首次在原子和分子水平上详细描述了传感反应机制。表面具有悬键的金属原子作为活性中心的概念可以加深对传感和其他催化反应机制的理解，并为高效传感材料、催化剂和光电设备的设计和制造提供新的见解。
