单层
纳米片
材料科学
氧化物
金属
纳米技术
基质(水族馆)
化学工程
自组装
薄膜
气体扩散
冶金
海洋学
地质学
工程类
燃料电池
作者
Jiansong Miao,Chuan Chen,Lie Meng,Shuguang Deng
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2019-04-19
卷期号:4 (5): 1279-1290
被引量:43
标识
DOI:10.1021/acssensors.9b00162
摘要
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.
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