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Front Chem. 2019 Apr 18;7:266. doi: 10.3389/fchem.2019.00266. eCollection 2019.

Mesoporous WO3 Nanofibers With Crystalline Framework for High-Performance Acetone Sensing.

Author information

1
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China.
2
Materials Genome Institute, Shanghai University, Shanghai, China.
3
Institute of Functional Materials, Donghua University, Shanghai, China.
4
School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, China.

Abstract

Semiconducting metal oxides with abundant active sites are regarded as promising candidates for environmental monitoring and breath analysis because of their excellent gas sensing performance and stability. Herein, mesoporous WO3 nanofibers with a crystalline framework and uniform pore size is successfully synthesized in an aqueous phase using an electrospinning method, with ammonium metatungstate as the tungsten sources, and SiO2 nanoparticles and polyvinylpyrrolidone as the sacrificial templates. The obtained mesoporous WO3 nanofibers exhibit a controllable pore size of 26.3-42.2 nm, specific surface area of 24.1-34.4 m2g-1, and a pore volume of 0.15-0.24 cm3g-1. This unique hierarchical structure, with uniform mesopores and interconnected channels, could facilitate the diffusion and transportation of gas molecules in the framework. Gas sensors, based on mesoporous WO3 nanofibers, exhibit an excellent performance in acetone sensing with a low limit of detection (<1 ppm), short response-recovery time (24 s/27 s), a linear relationship in a broad range, and good selectivity.

KEYWORDS:

WO3; acetone; electrospun; mesoporous materials; nanofibers; sensor

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