Graphene-enhanced metal oxide gas sensors at room temperature: a review

Owing to the excellent sensitivity to gases, metal-oxide semiconductors (MOS) are widely used as materials for gas sensing. Usually, MOS gas sensors have some common shortages, such as relatively poor selectivity and high operating temperature. Graphene has drawn much attention as a gas sensing mate...

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Bibliographic Details
Published in:Beilstein journal of nanotechnology Vol. 9; no. 1; pp. 2832 - 2844
Main Authors: Sun, Dongjin, Luo, Yifan, Debliquy, Marc, Zhang, Chao
Format: Journal Article
Language:English
Published: Germany Beilstein-Institut zur Föerderung der Chemischen Wissenschaften 09.11.2018
Beilstein-Institut
Subjects:
Adsorption
Ammonia
Defects
Detection
gas sensor
Gas sensors
Gases
Graphene
High temperature
Humidity
Influence
metal oxide
Metal oxide semiconductors
Metal oxides
Nanoscience
Nanotechnology
Nitrogen dioxide
nitrogen dioxide (NO2)
Operating temperature
Power consumption
Recovery time
Review
Room temperature
Selectivity
Semiconductors
Sensitivity
Sensors
Shortages
VOCs
Volatile organic compounds
Zinc oxides
gas sensor
room temperature
metal oxide
nitrogen dioxide (NO2)
graphene
ISSN:2190-4286, 2190-4286
Online Access:Get full text
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Summary:Owing to the excellent sensitivity to gases, metal-oxide semiconductors (MOS) are widely used as materials for gas sensing. Usually, MOS gas sensors have some common shortages, such as relatively poor selectivity and high operating temperature. Graphene has drawn much attention as a gas sensing material in recent years because it can even work at room temperature, which reduces power consumption. However, the low sensitivity and long recovery time of the graphene-based sensors limit its further development. The combination of metal-oxide semiconductors and graphene may significantly improve the sensing performance, especially the selectivity and response/recovery rate at room temperature. In this review, we have summarized the latest progress of graphene/metal-oxide gas sensors for the detection of NO 2 , NH 3 , CO and some volatile organic compounds (VOCs) at room temperature. Meanwhile, the sensing performance and sensing mechanism of the sensors are discussed. The improved experimental schemes are raised and the critical research directions of graphene/metal-oxide sensors in the future are proposed.
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ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.9.264