Room-temperature gas sensors based on titanium dioxide quantum dots for highly sensitive and selective H2S detection

Gas sensor; Hydrogen sulfide; Quantum dots; Room temperature; Titanium dioxide; Controllable size; Gas-sensors; Microwave-assisted; Performance; Ppb levels; Reaction temperature; Room temperature gas sensor; Solvothermal method; Ultra-small; Chemistry (all); Condensed Matter Physics; Physics and Astronomy (all); Surfaces and Interfaces; Surfaces, Coatings and Films; General Physics and Astronomy; General Chemistry

Abstract :

[en] Room-temperature gas sensors with high performance are crucial in practical application. This work prepared a series of controllable-size titanium dioxide quantum dots (TiO2 QDs) via a rapid microwave-assisted solvothermal method for detecting ppb-level H2S at room temperature. The effect of reaction temperature on the nanostructure and gas sensing properties was investigated systematically. The characterization results showed the samples presented ultra-small size (around 5–6 nm) nanostructure and modified surface state (including Ti3+ and oxygen defects). The S120-TiO2 QDs gas sensor showed the best sensing properties towards ppb-level H2S at room temperature, including high response (25.12 @ 500 ppb H2S), rapid response/recovery, low detecting limit level, good selectivity, and operating stability. The gas sensing mechanism was explained through the synergetic effect of ultra-small size nanostructure, large specific surface area, and surface defects, which are in favor of improving the surface activity and charge transfer efficiency. Moreover, the practical application of TiO2 QDs gas sensor in detecting the volatiles of fish (Pangasius) was also verified. This work developed a room temperature TiO2 quantum dots-based gas sensor, which is promised for practical application because of the rapid synthesis and high performance.

Research center :

CRIM - Ingénierie des matériaux

Disciplines :

Materials science & engineering

Author, co-author :

Wu, Kaidi; College of Mechanical Engineering, Yangzhou University, Yangzhou, China ; Service de Science des Matériaux, Faculté Polytechnique, Université de Mons, Mons, Belgium

Zhang, Wentao; College of Mechanical Engineering, Yangzhou University, Yangzhou, China

Zheng, Zichen; College of Mechanical Engineering, Yangzhou University, Yangzhou, China

Debliquy, Marc ; Université de Mons - UMONS

Zhang, Chao; College of Mechanical Engineering, Yangzhou University, Yangzhou, China

Language :

English

Title :

Room-temperature gas sensors based on titanium dioxide quantum dots for highly sensitive and selective H2S detection

Publication date :

30 May 2022

Journal title :

Applied Surface Science

ISSN :

0169-4332

eISSN :

1873-5584

Publisher :

Elsevier B.V.

Volume :

585

Pages :

152744

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://api.elsevier.com/content/article/PII:S0169433222003257?httpAccept=text/xml

Research unit :

F502 - Science des Matériaux

Research institute :

Research Institute for Materials Science and Engineering

Funders :

Outstanding Youth Foundation of Jiangsu Province of China
National Natural Science Foundation of China

Funding text :

This work is supported by the National Natural Science Foundation of China under Grant No. 51872254, the Outstanding Youth Foundation of Jiangsu Province of China under Grant No. BK20211548, the National Key Research and Development Program of China under Grant No. 2017YFE0115900, the Jiangsu Postgraduate Research and Innovation Program under Grant No. KYCX21_3229 and the Excellent Doctoral Dissertation Fund of Yangzhou University (2021).

Available on ORBi UMONS :

since 19 July 2022

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