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Issue 27, 2014
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Graphene-based gas sensor: metal decoration effect and application to a flexible device

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Abstract

Roles of metal nanoparticles (NPs) on graphene-based devices were investigated in terms of gas-sensing characteristics of NO2 and NH3, and flexible gas sensing was also realized for future applications. The synergistic combination of metal NPs and graphene modulates the electronic properties of graphene, leading to enhancement of selectivity and sensitivity in gas-sensing characteristics. Introduction of palladium (Pd) NPs on the graphene accumulates hole carriers of graphene, resulting in the gas sensor being sensitized by NH3 gas molecular adsorption. In contrast, aluminum (Al) NPs deplete hole carriers, which dramatically improves NO2 sensitivity. Furthermore, the sensitivity of flexible graphene-based gas sensors was also enhanced via the same approach, even after 104 bending cycles and was maintained after 3 months.

Graphical abstract: Graphene-based gas sensor: metal decoration effect and application to a flexible device

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Supplementary files

Article information


Submitted
14 Mar 2014
Accepted
01 May 2014
First published
07 May 2014

J. Mater. Chem. C, 2014,2, 5280-5285
Article type
Paper
Author version available

Graphene-based gas sensor: metal decoration effect and application to a flexible device

B. Cho, J. Yoon, M. G. Hahm, D. Kim, A. R. Kim, Y. H. Kahng, S. Park, Y. Lee, S. Park, J. Kwon, C. S. Kim, M. Song, Y. Jeong, K. Nam and H. C. Ko, J. Mater. Chem. C, 2014, 2, 5280
DOI: 10.1039/C4TC00510D

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