介孔材料
材料科学
纳米技术
纳米颗粒
选择性
分散性
化学工程
化学
催化作用
有机化学
高分子化学
工程类
作者
Keyu Chen,Wenhe Xie,Yu Deng,Jingting Han,Yongheng Zhu,Jianguo Sun,Kaiping Yuan,Limin Wu,Yonghui Deng
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-08-09
卷期号:17 (16): 15763-15775
被引量:11
标识
DOI:10.1021/acsnano.3c03549
摘要
Highly porous sensitive materials with well-defined structures and morphologies are extremely desirable for developing high-performance chemiresistive gas sensors. Herein, inspired by the classical alkaloid precipitant reaction, a robust and reliable active mesoporous nitrogen polymer sphere-directed synthesis method was demonstrated for the controllable construction of heteroatom-doped mesoporous tungsten oxide spheres. In the typical synthesis, P-doped mesoporous WO3 monodisperse spheres with radially oriented channels (P-mWO3-R) were obtained with a diameter of ∼180 nm, high specific surface area, and crystalline skeleton. The in situ-introduced P atoms could effectively adjust the coordination environment of W atoms (Wδ+-Ov), giving rise to dramatically enhanced active surface-adsorbed oxygen species and unusual metastable ε-WO3 crystallites. The P-mWO3-R spheres were applied for the sensing of 3-hydroxy-2-butanone (3H2B), a biomarker of foodborne pathogenic bacteria Listeria monocytogenes (LM). The sensor exhibited high sensitivity (Ra/Rg = 29 to 3 ppm), fast response dynamics (26/7 s), outstanding selectivity, and good long-term stability. Furthermore, the device was integrated into a wireless sensing module to realize remote real-time and precise detection of LM in practical applications, making it possible to evaluate food quality using gas sensors conveniently.
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