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Issue 36, 2018
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Aryl fluoride functionalized graphene oxides for excellent room temperature ammonia sensitivity/selectivity

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Abstract

Herein, we report the covalent functionalization of graphene oxide (GO) through ‘‘click’’ reaction and its applications towards ammonia sensing. This inimitable method of covalent functionalization involves linking GO with azide moiety and click coupling of different derivatives of aryl propargyl ether, which enhances the sensitivity towards ammonia. The functionalized GO were characterized using NMR, XRD, SEM, FT-IR, Raman, UV-Vis, TGA and DSC. Compared to pristine GO, the GO functionalized with Ar samples (GO-Ar) exhibit excellent room temperature ammonia sensing properties with good response/recovery characteristics. It has been observed that 2,3-difluoro and 2,3,4-trifluoro substituted aryl propargyl ether functionalized GO (GO-Ar2 and GO-Ar3) shows superior ammonia sensing with response/recovery of 63%/∼90% and 60%/100%, respectively at 20 ppm. The GO-Ar3 exhibits high sensitivity towards ammonia at 20–100 ppm. Computational studies supports the high sensitivity of GO-Ar towards ammonia due to its high adsorption energy.

Graphical abstract: Aryl fluoride functionalized graphene oxides for excellent room temperature ammonia sensitivity/selectivity

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Supplementary files

Article information


Submitted
01 Mar 2018
Accepted
29 May 2018
First published
05 Jun 2018

This article is Open Access

RSC Adv., 2018,8, 20440-20449
Article type
Paper

Aryl fluoride functionalized graphene oxides for excellent room temperature ammonia sensitivity/selectivity

F. Khurshid, M. Jeyavelan, K. Takahashi, M. S. Leo Hudson and S. Nagarajan, RSC Adv., 2018, 8, 20440
DOI: 10.1039/C8RA01818A

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