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

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 NO. 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 (-NH) and an acceptor unit (-SOH). The prepared ANS-rGO shows the highest response (R/R = 13.2 to 10 ppm NO) 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 NO 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.

High Sensitivity, Humidity-Independent, Flexible NO2 and NH3 Gas Sensors Based on SnS2 Hybrid Functional Graphene Ink

“…The great sensing behavior improvement of the nanohybrids of SnS 2 and S-rGO to NO 2 is ascribed to the sulfonated functional groups decoration, the unique absorption properties of SnS 2 , and the energy band coordination between SnS 2 and functional graphene. As an electron-withdrawing group with lone pairs of electrons, the −SO 3 H group leads graphene sheets to be hole-dope and tends to absorb NO 2 molecules on the S and O atoms. , This further enhances the p-type semiconductor properties of graphene and contributes to target gas adsorption. Besides, according to the calculation of Ou et al, the binding energy of SnS 2 for NO 2 is much greater than the other bound gas species, which account to the high sensitivity, and the specific physisorption sensing property leads to fast response to NO 2 .…”

Ultrasensitive Surface Plasmon Resonance Biosensor Using Blue Phosphorus–Graphene Architecture

“…Next, a few layers of graphene were deposited onto the BlueP interlayer to prevent the BlueP from oxidation. Moreover, the graphene overlayer will not only enhance the biosensing ability, but can also significantly capture aromatic biomolecules via non-covalent π-π stacking interaction force [23][24][25]. Therefore, there is no need for further surface modification for the BlueP-graphene interface.…”

Functionalized Graphene Surfaces for Selective Gas Sensing

“…(c) Gas-sensing responses of rGO (1.2), naphthalene-1-sulfonic acid sodium (NA)/rGO (1.9), and ANS-rGO (13.2) upon exposure to 10 ppm of NO 2 gas at room temperature. Adapted with permission from ref ( 27 ). Copyright 2017, Royal Society of Chemistry.…”