Three-Dimensional Graphene-Based Foams with "greater Electron Transferring Areas" Deriving High Gas Sensitivity

Journal article (2021)

Authors

Zhuo Chen South China Normal University, Beihang University
Jinrong Wang Beihang University
Nengjie Cao South China Normal University
Yao Wang South China Normal University
Hao Liu South China Normal University
Nicolaas Frans de Rooij South China Normal University
Ahmad Umar Najran University, Najran
Yancong Feng South China Normal University
P.J. French Bio-Electronics - EEMCS
Guofu Zhou South China Normal University
Research Group
Bio-Electronics (EEMCS) (TU Delft)
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Published Date

2021

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Bio-Electronics

Abstract

Graphene foams are promising three-dimensional (3D) architectures with the combination of the intrinsic nature of graphene and unique cellular structures for various realms. Herein, a facile technique is developed by combining supramolecular assembly with lyophilization to functionalize graphene with donor−π-acceptor (D−π-A) molecules and then massively transform the two-dimensional (2D) plane nanosheets into 3D foams. The as-prepared gas sensors work at room temperature (RT) and reveal comprehensive gas sensing performance with an ultrahigh response (R
a/R
g = 3.2, 10 ppm), excellent selectivity, and reliable repeatability toward NO
2. Notably, a gas sensing enhancement mechanism with density functional theory (DFT) calculations is proposed to unravel the synergetic effect of the “Greater Electron Transferring Area” and the specific 3D foam structure for the enhancement of charge transfer and NO
2 adsorption. The combination of supramolecular assembly and the lyophilization technique provides a strategy to prepare 3D architectural graphene-based materials for high-performance gas sensors and chemical trace detectors.

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