材料科学
介孔材料
纳米技术
电极
蒸发
基质(水族馆)
聚苯乙烯
涂层
多孔性
选择性
化学工程
聚合物
催化作用
复合材料
生物化学
化学
工程类
物理
海洋学
物理化学
热力学
地质学
作者
Yuan Ren,Yu Deng,Bijia Wang,Yanyan Li,Hongxiu Yu,Yidong Zou,Limin Wu,Yonghui Deng
出处
期刊:Small
[Wiley]
日期:2024-05-15
标识
DOI:10.1002/smll.202311659
摘要
Abstract The performance consistency of the gas sensor is strongly dependent on the interface binding between the sensitive materials and the electrodes. Traditional powder coating methods can inevitably lead to differences in terms of substrate‐film interface interaction and device performance, affecting the stability and lifetime. Thus, efficient growth of sensitive materials on device substrates is crucial and essential to enhance the sensing performance, especially for stability. Herein, hierarchically ordered macro/mesoporous WO 3 films are in situ synthesized on the electrode via a facile soft/hard dual‐template strategy. Orderly arrayed uniform polystyrene (PS) microspheres with tailored size ( ca . 1.2 µm) are used as a hard template, and surfactant Pluronic F127 as a soft template can co‐assemble with tungsten precursor into ordered mesostructure in the interstitials of PS colloidal crystal induced by solvent evaporation. Benefiting from its rich porosity and high stability, the macro/mesoporous WO 3 ‐based sensor shows high sensitivity ( R air /R gas = 307), fast response/recovery speed (5/9 s), and excellent selectivity ( S H2S /S max > 7) toward 50 ppm H 2 S gas (a biomarker for halitosis). Significantly, the sensors exhibit an extended service life with a negligible change in sensing performance within 60 days. This lab‐on‐device synthesis provides a platform method for constructing stable nanodevices with good consistency and high stability, which are highly desired for developing high‐performance sensors.
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