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A new approach to flexible humidity sensors using graphene quantum dots

Abstract

Highly sensitive flexible humidity sensors based on graphene quantum dots (GQDs) were developed. GQDs were prepared using a facile hydrothermal method and characterized considering morphological, structural, and compositional experiments. Then, humidity sensing properties in correlation with flexibility characteristic were investigated. Good selectivity and response (~390 for a RH change of 99%), broad detection range (1-100% RH), rather short response and recovery time (12 and 43 s, respectively) as well as flexibility were obtained, demonstrating that GQDs sensors have potential for application in wearable electronics and RH monitoring. Detection of hydrogen (H2) gas by GQDs confirms exchanging proton through adsorbed H+ species in H2O sensing mechanism. Considering the structure of the sensing material and RT performance, capillary condensation resulting in formation of a conductive path by water molecules is suggested as the dominant sensing mechanism at high RH.

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Publication details

The article was received on 20 Apr 2017, accepted on 10 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC01740E
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    A new approach to flexible humidity sensors using graphene quantum dots

    Z. S. Hosseini, A. Irajizad, M. A. Ghiass, S. Fardindoost and S. Hatamie, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01740E

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