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ThinkMind // ALLSENSORS 2018, The Third International Conference on Advances in Sensors, Actuators, Metering and Sensing // View article allsensors_2018_9_20_70111


Reduced Graphene Oxide-ZnO Nanotubes Based Binary Hybrid Structure as Room Temperature Ethanol Sensor

Authors:
Partha Bhattacharyya
Debanjan Acharyya
Indranil Maity

Keywords: rGO-ZnO nanotubes; hybrid structure; room temperature ethanol sensor; fast response time/recovery time

Abstract:
In this paper, we report a highly sensitive and fast responsive room temperature ethanol sensor based on rGO-ZnO nanotubes (NTs) hybrid structure. ZnO NTs were grown on Indium doped Tin Oxide (ITO) substrate using a two-step process, consisting of electro-deposition (for ZnO nanorods deposition) and electrochemical etching (for etching of ZnO nanorods to form nanotubes). After that, rGO layer was deposited on top of the ZnO NTs employing a programmed dip coating technique. Subsequently, detailed structural and morphological characterizations were carried out using FESEM (Field Emission Scanning Electron Microscopy), Raman spectroscopy and XPS (X-Ray photo electron Spectroscopy) techniques to confirm the formation of hybrid structure. After that, alcohol (i.e. ethanol, methanol, 2-propanol) sensing properties of the device were investigated in the concentration range of 1-700 ppm at different temperatures (27–175°C). ~70% response magnitude, (towards ethanol) was observed at room temperature. Moreover, fast response time and recovery time were also noticed (response time: ~56 s and recovery time: ~202 s at 100 ppm concentration of ethanol). Such sensing performance is attributed to the synergistic hybridization of ZnO NTs and rGO, which offer an extremely large number of gas adsorption/desorption sites and high carrier mobility.

Pages: 103 to 105

Copyright: Copyright (c) IARIA, 2018

Publication date: March 25, 2018

Published in: conference

ISSN: 2519-836X

ISBN: 978-1-61208-621-7

Location: Rome, Italy

Dates: from March 25, 2018 to March 29, 2018

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