Enhancement in carbon monoxide sensing performance by reduced graphene oxide/trimanganese tetraoxide system

•Uniform morphology of rGO-Mn3O4 system on AAO template.•rGO-Mn3O4 sensor produced enhanced sensing towards CO especially at 25 °C in humid background.•Response time and recovery time of the fabricated sensor is much improved for sensing gases at room temperature.•The fabricated sensor is showing go...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 325; p. 128749
Main Authors John, Neetha, Abraham, K.E.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.12.2020
Elsevier Science Ltd
Subjects
Carbon monoxide
Gas sensors
Graphene
Humidity
Manganese oxides
Morphology
Nanocomposites
Operating temperature
Recovery time
Response time
Room temperature
Sensors
Mn3O4
Anodic aluminum oxide
Gas sensor
Reduced graphene oxide
CO
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Summary:•Uniform morphology of rGO-Mn3O4 system on AAO template.•rGO-Mn3O4 sensor produced enhanced sensing towards CO especially at 25 °C in humid background.•Response time and recovery time of the fabricated sensor is much improved for sensing gases at room temperature.•The fabricated sensor is showing good reproducibility.•Fabrication of low cost and environmental friendly sensor to sense CO at 100 °C and 200 °C. The article reports enhanced sensing response of reduced graphene oxide (rGO)-trimanganese tetraoxide (Mn3O4) nanocomposite gas sensor towards carbon monoxide (CO) at 298 K in a humid background. The outstanding performance of this sensor is mainly due to its high gas absorbing nature owing to uniform morphology and increased conductivity of rGO-Mn3O4 network. The sensor exhibits high sensitivity, good stability, quick response and rapid recovery. Furthermore, rGO-Mn3O4 sensor is showing better response time and reduced recovery time. The sensor response time for 50 ppm of CO is 3 s at 298 K, whereas for 20 ppm, it is 8 s. Gas sensing response at room temperature is around 70 % for 50 ppm of CO. The sensor also showed enhanced sensing at 473 K for low concentration (4 ppm of CO) with response time of 2 s and recovery time 5 s, respectively. Humidity independent sensor signal along with reduced response time, especially at a low operating temperature makes this sensor a very promising material for CO detection in conditions of variable humidity.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2020.128749