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Current Nanoscience

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ISSN (Print): 1573-4137
ISSN (Online): 1875-6786

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Research Article

A Highly Sensitive Room-Temperature NO2 Gas Sensor based on Porous MnO2/rGO Hybrid Composites

Author(s): Hui Zhang, Kangtai Ou, Ruihua Guan, Yang Cao, Youyi Sun* and Xiao Li

Volume 19, Issue 3, 2023

Published on: 07 October, 2022

Page: [401 - 409] Pages: 9

DOI: 10.2174/1573413718666220616154244

Price: $65

Abstract

Background: The NOX (e.g. NO2) is harmful to human health and environmental quality. It is of great interest to monitor the hazardous NOX with a simple, reliable, and sensitive sensor. Currently, the commonly used detection methods have disadvantages of complex operation, unstable cycling performance and low sensitivity.

Objective: In this paper, rGO coated Ni foam supported MnO2 is synthesized to develop a more advanced detection method for the rapid analysis of NO2.

Methods: A three-dimensional nickel foam supported MnO2 and rGO (MnO2/rGO@NF) was prepared by a hydrothermal method for application in binder-free electrode of NO2 sensor.

Results: The MnO2/rGO@NF composite displayed significantly better NO2 sensing performance compared to single MnO2@NF or rGO@NF. The excellent sensing response (5.9%) as well as high cycling stability were observed in the presence of 50.0 ppm NO2 at room temperature. Furthermore, the mechanism of the great gas-sensing performance was also investigated by the density functional theory (DFT).

Conclusion: These results were very important to further design and prepare new sensitive materials applied in binder-free electrode of gas NO2 sensors.

Keywords: rGO/MnO2, 3D foam, gas sensor, room temperature, density functional theory, sensors.

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