1D/2D heterojunction; Ammonia; Gas sensors; MWCNTs/Bi2MoO6; Re-orientated crystal facets; 1d/2d heterojunction; Conductometrics; Crystal facets; Gas sensing mechanism; Gas-sensors; Limit of detection; MWCNT's; MWCNT/bi2MoO6; Re-orientated crystal facet; Working temperatures; Electronic, Optical and Magnetic Materials; Instrumentation; Condensed Matter Physics; Surfaces, Coatings and Films; Metals and Alloys; Electrical and Electronic Engineering; Materials Chemistry
Abstract :
[en] High working temperature and the insufficient limits of detection limit the broad applications of semiconductor chemiresistive gas sensors. Herein, pure Bi2MoO6 nanosheets and a series of one-dimensional/two-dimensional (1D/2D) multi-walled CNTs/Bi2MoO6 nanocomposites were developed via a facile hydrothermal route for room-temperature ammonia monitoring. The as-synthesized samples were characterized by various analytical techniques. 0.5 wt% MWCNTs/Bi2MoO6 nanocomposites showed the best sensing properties to 10–50 ppm NH3, including low limit of detection (157 ppb), high response (Ra/Rg = 44.2 @ 50 ppm), good selectivity, reproductivity, and anti-humidity sensing ability. The enhanced gas sensing mechanism was proposed based on the synergetic effect of high-energy crystal facets, modified surface characteristics and p-n heterojunction. Density functional theory (DFT) studies were also carried out to further clarify the gas sensing mechanisms. This work provides a practical approach to design and fabricate high-precision gas sensors working at room temperature.
Disciplines :
Materials science & engineering
Author, co-author :
Wu, Kaidi ; Université de Mons - UMONS > Faculté Polytechnique > Service de Science des Matériaux ; College of Mechanical Engineering, Yangzhou University, Yangzhou, China
Chai, Hongfeng; College of Mechanical Engineering, Yangzhou University, Yangzhou, China
Xu, Kaichun; College of Mechanical Engineering, Yangzhou University, Yangzhou, China
Debliquy, Marc ; Université de Mons - UMONS > Faculté Polytechnique > Service de Science des Matériaux
Zhang, Chao ; Université de Mons - UMONS > Faculté Polytechnique > Science des Matériaux ; College of Mechanical Engineering, Yangzhou University, Yangzhou, China
Language :
English
Title :
Effect of {010} crystal facets of Bi2MoO6 and 1D/2D heterostructures for conductometric room temperature NH3 gas sensors
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
Funding text :
This work is supported by the Outstanding Youth Foundation of Jiangsu Province of China under Grant No. BK20211548 , the Natural Science Foundation of China under Grant No. 51872254 , the Postgraduate Research & Practice Innovation Program of Jiangsu Province under Grant No. KYCX21_3229 and the Excellent Doctoral Dissertation Fund of Yangzhou University ( 2021_06 ).
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