A comparative study on gas-sensing behavior of reduced graphene oxide (rGO) synthesized by chemical and environment-friendly green method

This paper presents a comparative study on gas-sensing behavior of reduced graphene oxide (rGO) synthesized by chemical and green synthesis route. GO is synthesized by Hummers method and then reduced employing two reducing agents hydrazine hydrate [represented by (rGO) 1 ] and l -citrulline [represe...

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Bibliographic Details
Published in:Applied nanoscience 2020-02, Vol.10 (2), p.517-528
Main Authors: Sharma, Neeru, Vyas, Rishi, Sharma, Vikas, Rahman, Habeebur, Sharma, S. K., Sachdev, K.
Format: Article
Language:English
Subjects:
Chemical synthesis
Chemistry and Materials Science
Comparative studies
Detection
Graphene
Hydrazines
Materials Science
Membrane Biology
Nanochemistry
Nanotechnology
Nanotechnology and Microengineering
Nitrogen dioxide
Operating temperature
Organic chemistry
Original Article
Oxidation
Reducing agents
Reduction
Thermal stability
Thin films
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Summary:This paper presents a comparative study on gas-sensing behavior of reduced graphene oxide (rGO) synthesized by chemical and green synthesis route. GO is synthesized by Hummers method and then reduced employing two reducing agents hydrazine hydrate [represented by (rGO) 1 ] and l -citrulline [represented by (rGO) 2 ]. Synthesized products were then obtained in the form of thin films, and tested for 10 ppm NO 2 and CO at operating temperatures of 50, 100, and 150 °C. The green-synthesized reduced graphene oxide (rGO) 2 exhibits higher relative response of 254.7% as compared to conventionally synthesized (rGO) 1 (93.9%) and GO (22.7%) for 10 ppm NO 2 at operating temperature of 150 °C. Furthermore, a switching of conductivity from usual p-type behavior to n-type on exposure of NO 2 is observed at all operating temperatures (50, 100, and 150 °C) for GO, (rGO) 1 , and (rGO) 2 . The XRD, FTIR, and Raman confirm the oxidation and reduction process. (rGO) 2 shows high thermal stability as observed through TGA. FESEM and TEM images show wrinkled sheet structure for GO as well (rGO) 1 and (rGO) 2 . The data observed from the characterization of resultant products have made it possible to explain better reduction of GO through green-reducing agent and enhanced gas-sensing performance of green-synthesized reduced graphene oxide.
ISSN:2190-5509
2190-5517
DOI:10.1007/s13204-019-01138-7