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Title: Enhancement of humidity sensitivity of graphene through functionalization with polyethylenimine
Authors: Ben Aziza, Zeineb
Zhang, Kang
Baillargeat, Dominique
Zhang, Qing
Issue Date: 2015
Source: Ben Aziza, Z., Zhang, K., Baillargeat, D., & Zhang, Q. (2015). Enhancement of humidity sensitivity of graphene through functionalization with polyethylenimine. Applied Physics Letters, 107(13), 134102-.
Series/Report no.: Applied Physics Letters
Abstract: In this work, we show that the sensing performance of graphene based humidity sensors can be largely improved through polymer functionalization. Chemical vapor deposited graphene is functionalized with amine rich polymer, leading to electron transfer from amine groups in the polymer to graphene. The functionalized graphene humidity sensor has demonstrated good sensitivity, recovery, and repeatability. Charge transfer between the functionalized graphene and water molecules and the sensing mechanism are studied systemically using field effect transistor geometry and scanning Kelvin probe microscopy.
DOI: 10.1063/1.4932124
Schools: School of Electrical and Electronic Engineering 
Rights: © 2015 AIP Publishing LLC. This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of AIP Publishing LLC. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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