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A 2D/2D/2D Ti3C2Tx@TiO2@MoS2 heterostructure as an ultrafast and high-sensitivity NO2 gas sensor at room-temperature.

Authors :
Liu, Zhuo
Lv, He
Xie, Ying
Wang, Jue
Fan, Jiahui
Sun, Baihe
Jiang, Lin
Zhang, Yang
Wang, Ruihong
Shi, Keying
Source :
Journal of Materials Chemistry A; 6/14/2022, Vol. 10 Issue 22, p11980-11989, 10p
Publication Year :
2022

Abstract

Very diverse two-dimensional (2D) materials have bloomed in NO<subscript>2</subscript> gas sensing applications, which provides new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure of the Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript>@TiO<subscript>2</subscript>@MoS<subscript>2</subscript> composite was well designed via a facile one-step hydrothermal route, in which TiO<subscript>2</subscript> nanosheets are in situ grown on ultrathin and highly conductive Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> MXene. Simultaneously, the few-layer and vertically oriented MoS<subscript>2</subscript> nanoflakes rich in active edge-sites were uniformly distributed in the composite. Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript> MXene and MoS<subscript>2</subscript> act respectively as the electron reservoir and main sensitive material. The strong interfacial contact in different components facilitated the transfer of charge carriers and their spatial separation. Integrating the unique structural and electronic properties, the as-prepared Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript>@TiO<subscript>2</subscript>@MoS<subscript>2</subscript> sensor exhibited a remarkable gas sensing performance at room temperature (R<subscript>a</subscript>/R<subscript>g</subscript> = 55.16, 50 ppm NO<subscript>2</subscript>), which is 7.3, 3.8 and 2.1 times higher than that of pristine MoS<subscript>2</subscript>, TiO<subscript>2</subscript>@MoS<subscript>2</subscript> and Ti<subscript>3</subscript>C<subscript>2</subscript>T<subscript>x</subscript>@MoS<subscript>2</subscript> composites, respectively. It also achieved ultrafast response time (1.8 s), more than 90% recoverability, low detection limit (23 ppb), dedicated selectivity and as long as eight-week stability. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20507488
Volume :
10
Issue :
22
Database :
Complementary Index
Journal :
Journal of Materials Chemistry A
Publication Type :
Academic Journal
Accession number :
157297017
Full Text :
https://doi.org/10.1039/d1ta09369j