Green Synthesis of 3D Chemically Functionalized Graphene Hydrogel for High-Performance NH3 and NO2 Detection at Room Temperature

Jin Wu, Yaoming Wei, Haojun Ding, Zixuan Wu, Xing Yang, Zhenyi Li, Wenxi Huang, Xi Xie, Kai Tao, Xiaotian Wang

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

To address the low gas sensitivity of pristine graphene (Gr), chemical modification of Gr has been proved as a promising route. However, the existing chemical functionalization method imposes the utilization of toxic chemicals, increasing the safety risk. Herein, vitamin C (VC)-modified reduced graphene hydrogel (V-RGOH) is synthesized via a green and facile self-assembly process with the assistance of biocompatible VC molecules for high-performance NH3 and NO2 detection. The three-dimensional (3D) structured V-RGOH is highly sensitive to low-concentration NH3 and NO2 at room temperature. In comparison with those of the unmodified RGOH, the V-RGOH gas sensors display an order of magnitude higher sensitivity and much lower limit of detection, resulting from the enhanced interaction between VC and analytes. NH3 and NO2 with extremely low concentrations of 500 and 100 ppb are detected experimentally. Notably, imbedded microheaters are exploited to explore the temperature-dependent gas sensing properties, revealing the negative and positive impacts of temperature on the sensitivity and recovery speed, respectively. Notably, the V-RGOH sensor exhibits remarkable selectivity and linearity and a wide detection range. This work reveals the remarkable effects of chemical modification with biodegradable molecules and 3D structure design on improving the gas sensing performance of the Gr material.

Original languageEnglish
Pages (from-to)20623-20632
Number of pages10
JournalACS Applied Materials and Interfaces
Volume12
Issue number18
DOIs
StatePublished - 6 May 2020

Keywords

  • 3D structure
  • ammonia sensing
  • chemical modified graphene hydrogel
  • green synthesis
  • NO sensing

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