Low pressure hydrogen sensing based on carbon nanotube field emission: Mechanism of atomic adsorption induced work function effects

The mechanism of the innovative adsorption based field emission hydrogen sensing technique is investigated from experimental and first-principles investigations. Hydrogen pressure from 10−3 to 10−7 Pa range could be detected. High carbon nanotube (CNT) crystallinity plays key role for the reduction...

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Bibliographic Details
Published in:Carbon (New York) 2017-11, Vol.124, p.669-674
Main Authors: Zhao, Yangyang, Cai, Jianqiu, Luo, Haijun, Kang, Song, Qian, Weijin, Dong, Changkun
Format: Article
Language:English
Subjects:
Adsorption
Carbon
Carbon nanotubes
Crystal defects
Detection
Emission analysis
Emissions
Emitters
Field emission
Hydrogen
Low pressure
Nanotubes
Ohmic dissipation
Work functions
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Summary:The mechanism of the innovative adsorption based field emission hydrogen sensing technique is investigated from experimental and first-principles investigations. Hydrogen pressure from 10−3 to 10−7 Pa range could be detected. High carbon nanotube (CNT) crystallinity plays key role for the reduction of the effective work function from the dissociated hydrogen adsorption, leading to the field emission current increase. For CNT emitters with high dangling-bond (DB) type of defects/structures, the dissociated H adsorption occurs preferentially on the DB site with negligible work function variation. Joule heating & temperature rising is a core factor to assist the dissociated hydrogen adsorption with enhanced sensing effect. For work function sensitive CNT devices, operations under hydrogen & high temperature conditions may produce performance stability issue. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2017.09.032