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학술지 Synthesis and Gas Sensing Properties of WS2 Nanocrystallites Assembled Hierarchical WS2 Fibers by Electrospinning
Cited 0 time in scopus
저자
윤두협, 김봉준, 윤선진
발행일
202003
출처
Nanotechnology, v.31 no.10, pp.1-12
ISSN
0957-4484
출판사
Institute of Physics (IOP)
DOI
https://dx.doi.org/10.1088/1361-6528/ab58a9
협약과제
19HB1100, 차세대 신기능 스마트디바이스 플랫폼을 위한 대면적 이차원소재 및 소자 원천기술 개발, 윤선진
초록
© 2019 IOP Publishing Ltd. A gas sensor based on a hierarchical WS2 structure embedded with vertically aligned WS2 nanocrystallites was demonstrated. The three-dimensional (3D) hierarchical structure provides many edge sites of nanocrystallites and an extremely large gas contact volume, resulting in a high gas response. The decreased contact resistance between the 3D hierarchical WS2 fibers and sensor electrode resulted in improved NO2 response. We fabricated a one-dimensional (1D) conductive WS2 fiber using a two-step annealing process under sulfur flow (sulfurization). It delivers a continuous and conductive carrier path and lowers the potential barrier at the interface of the WS2 nanocrystallites (top) and electrospun WS2 fiber (bottom), resulting in an improved gas response. We developed 3D hierarchical WS2 fibers embedded with vertically aligned WS2 nanocrystallites to increase the gas adsorption site in comparison with that of 1D WS2 fibers without WS2 flakes. Vertically aligned WS2 nanocrystallites were formed after a two-step annealing treatment. Sensors based on the 3D hierarchical WS2 fibers embedded with WS2 flakes, showed higher response to NO2 gas in comparison to that of pure WS2 fibers without WS2 flakes.
키워드
2D material, electrospinning, gas contact area, gas sensing
KSP 제안 키워드
2D material, Adsorption site, Annealing Treatment, Conductive carrier, Contact Volume, Contact area, Contact resistance(73.40.Cg), Gas adsorption, Gas response, Gas sensing properties, One-dimensional