Three-dimensional hierarchical and superhydrophobic graphene gas sensor with good immunity to humidity

Jin Wu, Kai Tao, Jianmin Miao, Leslie K. Norford

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

Abstract

Superhydrophobic reduced graphene oxide (RGO) with unique 3D hierarchical structures is synthesized by exploiting one-step spark plasma sintering (SPS) within 60 s for high-performance NO2 detection. The effective removal of oxygenated groups and generation of 3D hierarchical structures in SPS render the RGO superhydrophobic. The superhydrophobicity makes the fabricated RGO sensor exceptionally immune to high relative humidity (RH). Specifically, the RGO sensor exhibits a response degradation less than 5.5% to 1 ppm NO2 when the RH increases from 0% to 70%. Importantly, an integrated microheater array is employed to remarkably activate the RGO-based NO2 sensor, boosting the sensitivity. Consequently, the NO2 sensor displays a high sensitivity (25.5 ppm-1) and an extremely low limit of detection (9.1 ppb). The boosted NO2 sensing performance is attributed to superhydrophobicity, 3D hierarchical structures with high specific surface area (850 m2/g), abundant defect sites and thermal activation with microheaters.

Original languageEnglish
Title of host publication2018 IEEE Micro Electro Mechanical Systems, MEMS 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages901-904
Number of pages4
ISBN (Electronic)9781538647820
DOIs
StatePublished - 24 Apr 2018
Externally publishedYes
Event31st IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2018 - Belfast, United Kingdom
Duration: 21 Jan 201825 Jan 2018

Publication series

NameProceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)
Volume2018-January
ISSN (Print)1084-6999

Conference

Conference31st IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2018
Country/TerritoryUnited Kingdom
CityBelfast
Period21/01/1825/01/18

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