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Self-Assembled Monolayer of Metal Oxide Nanosheet and Structure and Gas-Sensing Property Relationship
ACS Sensors ( IF 8.2 ) Pub Date : 2019-04-19 00:00:00 , DOI: 10.1021/acssensors.9b00162 Jiansong Miao 1 , Chuan Chen 2 , Lie Meng 1 , Y.S. Lin 1
ACS Sensors ( IF 8.2 ) Pub Date : 2019-04-19 00:00:00 , DOI: 10.1021/acssensors.9b00162 Jiansong Miao 1 , Chuan Chen 2 , Lie Meng 1 , Y.S. Lin 1
Affiliation
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Semiconducting 2D metal oxides have attracted great research interests for gas-sensing applications because of their considerable specific surface area and highly homogeneous surface. Developing a method for fabricating thin films of 2D metal oxides is crucial for minimizing the negative effects on sensing performance caused by slow diffusion. In this work, a simple, versatile, and highly reproducible self-assembly method is developed for fabricating monolayer film sensors made from metal oxide nanosheets with much superior sensing performance compared with their thick film counterparts. To prepare the monolayer film sensors, a monolayer film of metal oxide nanosheets, self-assembled at the air–water interface, is transferred onto a sensor substrate. The CuO monolayer sensors prepared with this self-assembly method show much improved gas sensitivity (sensor signal: 350% vs 100% at 5 ppm of H2S) and faster response and recovery rate (τres: 20 s vs 110 s; τrec: 120 s vs 320 s) than the thick film sensors prepared from the same sensing material. The enhanced sensing performance demonstrated by the monolayer film of CuO nanosheets is explained quantitively with a modified coupled reaction-diffusion model. Similar enhancement on gas-sensing performance is also observed for the ZnO-nanosheet-based monolayer sensors prepared by the same self-assembly method.
中文翻译：
金属氧化物纳米片的自组装单层及其结构与气敏性能的关系
半导体二维金属氧化物因其相当大的比表面积和高度均一的表面而在气体传感应用领域引起了极大的研究兴趣。开发一种制造2D金属氧化物薄膜的方法对于最大程度地减小由缓慢扩散引起的对传感性能的负面影响至关重要。在这项工作中，开发了一种简单，通用且可重现的自组装方法，用于制造由金属氧化物纳米片制成的单层膜传感器，与厚膜对应物相比，其传感性能要好得多。为了制备单层膜传感器，将在空气-水界面处自组装的金属氧化物纳米片单层膜转移到传感器基板上。2 S）和更快的响应和恢复率（τ RES：20秒VS 110秒;τ REC：120 s和320个S）比从相同的感测材料制备的厚膜传感器。用改进的耦合反应扩散模型定量解释了CuO纳米片单层膜所表现出的增强的传感性能。对于通过相同的自组装方法制备的基于ZnO-纳米片的单层传感器，也观察到了类似的气体传感性能增强。
更新日期：2019-04-19
中文翻译：
金属氧化物纳米片的自组装单层及其结构与气敏性能的关系
半导体二维金属氧化物因其相当大的比表面积和高度均一的表面而在气体传感应用领域引起了极大的研究兴趣。开发一种制造2D金属氧化物薄膜的方法对于最大程度地减小由缓慢扩散引起的对传感性能的负面影响至关重要。在这项工作中，开发了一种简单，通用且可重现的自组装方法，用于制造由金属氧化物纳米片制成的单层膜传感器，与厚膜对应物相比，其传感性能要好得多。为了制备单层膜传感器，将在空气-水界面处自组装的金属氧化物纳米片单层膜转移到传感器基板上。2 S）和更快的响应和恢复率（τ RES：20秒VS 110秒;τ REC：120 s和320个S）比从相同的感测材料制备的厚膜传感器。用改进的耦合反应扩散模型定量解释了CuO纳米片单层膜所表现出的增强的传感性能。对于通过相同的自组装方法制备的基于ZnO-纳米片的单层传感器，也观察到了类似的气体传感性能增强。
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