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Issue 42, 2017
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Enhancement of charge transfer between graphene and donor–π-acceptor molecule for ultrahigh sensing performance

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Abstract

In this work, we report the formation of a supramolecular assembly of graphene with a donor–π-acceptor (D–π-A) molecule to detect low concentration NO2. 5-Aminonaphthalene-1-sulfonic acid (ANS) was used herein to π–π stack with reduced graphene oxide (rGO), the resulting π-conjugated bridge being linked by a donor unit (–NH2) and an acceptor unit (–SO3H). The prepared ANS-rGO shows the highest response (Ra/Rg = 13.2 to 10 ppm NO2) so far among the reported organic molecule modified graphene materials, and excellent selectivity and reliable reversibility at room temperature. Furthermore, as revealed through the charge density difference calculation, it is the effective enhancement of charge transfer between ANS and graphene that should be responsible for the sharp improvement of NO2 gas response of the material. Thus, for the first time, we demonstrate that supramolecular assembly of a D–π-A molecule and graphene provides a facile and effective approach to fabrication of high performance graphene-based gas sensors.

Graphical abstract: Enhancement of charge transfer between graphene and donor–π-acceptor molecule for ultrahigh sensing performance

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Publication details

The article was received on 13 Jun 2017, accepted on 03 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR04209D
Citation: Nanoscale, 2017,9, 16273-16280
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    Enhancement of charge transfer between graphene and donor–π-acceptor molecule for ultrahigh sensing performance

    W. Pei, T. Zhang, Y. Wang, Z. Chen, A. Umar, H. Li and W. Guo, Nanoscale, 2017, 9, 16273
    DOI: 10.1039/C7NR04209D

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