Three-Dimensional Graphene-Based Foams with “Greater Electron Transferring Areas” Deriving High Gas Sensitivity

Zhuo Chen, Jinrong Wang, Nengjie Cao, Yao Wang*, Hao Li, Nicolaas Frans de Rooij, Ahmad Umar, Yancong Feng*, Paddy J. French, Guofu Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

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 (Ra/Rg = 3.2, 10 ppm), excellent selectivity, and reliable repeatability toward NO2. 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 NO2 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.

Original languageEnglish (US)
Pages (from-to)13234-13245
Number of pages12
JournalACS Applied Nano Materials
Volume4
Issue number12
DOIs
StatePublished - Dec 24 2021

Keywords

  • charge transfer
  • gas sensors
  • graphene foams
  • lyophilization
  • supramolecular assembly

ASJC Scopus subject areas

  • General Materials Science

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