Modulating the sensing properties of graphene through an eco-friendly metal-decoration process

Modulating the sensing properties of graphene through an eco-friendly metal-decoration process

Herein we investigate the effect of graphene decoration with metal nanoparticles, namely Ag and Pd, starting from pristine graphene (GR). Decoration is directly made on graphene obtained by Liquid Phase Exfoliation of natural graphite in eco-friendly solvents. The nanoparticles are synthesized in si...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Vol. 222; pp. 1032 - 1042
Main Authors: Alfano, B., Polichetti, T., Mauriello, M., Miglietta, M.L., Ricciardella, F., Massera, E., Di Francia, G.
Format: Journal Article
Language:English
Published: Elsevier B.V 01-01-2016
Subjects:
Decoration
Detection
Gas sensor
Graphene
Hydrogen
Metal decoration
Nanoparticles
Nitrogen dioxide
Palladium
Silver
Nanoparticles
Silver
Metal decoration
Gas sensor
Palladium
Graphene
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Summary:Herein we investigate the effect of graphene decoration with metal nanoparticles, namely Ag and Pd, starting from pristine graphene (GR). Decoration is directly made on graphene obtained by Liquid Phase Exfoliation of natural graphite in eco-friendly solvents. The nanoparticles are synthesized in situ via chemical reduction from metal salts promoted by microwave treatment, resulting in metal nanoparticles directly stuck onto the pristine graphene surface. Sensing layers based on graphene and metal decorated graphenes were exposed to hydrogen, nitrogen dioxide and ammonia. Pristine graphene showed a marked specificity towards NO2 gas. Palladium nanoparticles enhanced graphene response towards hydrogen, while devices based on graphene/silver nanoparticles were highly specific towards ammonia detection. This eco-friendly and straightforward preparation method of graphene and graphene hybrids demonstrates an effective modulation of the sensing properties of graphene with respect to sensitivity and selectivity.
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ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2015.09.008