Hydrogen sensing characteristics from carbon nanotube field emissions

An innovative hydrogen sensing concept is demonstrated based on the field emission from multi-walled carbon nanotubes, where the low emission currents rise in proportion to hydrogen partial pressures above 10 −9 Torr. Experimental and first principles studies reveal that the sensing mechanism is att...

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Bibliographic Details
Published in:Nanoscale 2016-03, Vol.8 (1), p.5599-564
Main Authors: Dong, Changkun, Luo, Haijun, Cai, Jianqiu, Wang, Fuquan, Zhao, Yangyang, Li, Detian
Format: Article
Language:English
Subjects:
Chemisorption
Detection
Field emission
Hydrogen storage
Nanostructure
Partial pressure
Reduction
Work functions
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Summary:An innovative hydrogen sensing concept is demonstrated based on the field emission from multi-walled carbon nanotubes, where the low emission currents rise in proportion to hydrogen partial pressures above 10 −9 Torr. Experimental and first principles studies reveal that the sensing mechanism is attributed to the effective work function reduction from dissociative hydrogen chemisorption. The embedded Ni catalyst would assist both the hydrogen dissociation and work function reduction. This technique is promising to build miniature low cost hydrogen sensors for multiple applications. This work is valuable for studies of nanocarbon-gas reaction mechanisms and the work function properties in adsorption related applications, including field emission, hydrogen storage, energy cells, and gas sensing. An innovative hydrogen sensing concept is demonstrated based on the field emission from multi-walled carbon nanotubes, where the low emission currents rise in proportion to hydrogen partial pressures above 10 −9 Torr.
ISSN:2040-3364
2040-3372
DOI:10.1039/c5nr08661b