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Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles

In the present study, we have evaluated the gas sensing and photocatalytic activity of reduced graphene oxide (rGO) conjugated titanium dioxide (TiO2) nanoparticles (NPs) formed by the hydrothermal method. The assynthesized rGO-TiO2 nanocomposite were characterized for the physicochemical properties...

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Main Authors:	Sagadevan, Suresh, Lett, J. Anita, Weldegebrieal, Getu Kassegn, Biswas, Md Rokon Ud Dowla, Oh, Won Chun, Alshahateet, Solhe F., Fatimah, Is, Mohammad, Faruq, Al-Lohedan, Hamad A., Paiman, Suriati, Podder, Jiban, Johan, Mohd Rafie
Format:	Article
Published:	Elsevier 2021
Subjects:	QC Physics QD Chemistry
Online Access:	http://eprints.um.edu.my/34561/
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spelling	my.um.eprints.345612022-05-30T03:01:06Z http://eprints.um.edu.my/34561/ Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles Sagadevan, Suresh Lett, J. Anita Weldegebrieal, Getu Kassegn Biswas, Md Rokon Ud Dowla Oh, Won Chun Alshahateet, Solhe F. Fatimah, Is Mohammad, Faruq Al-Lohedan, Hamad A. Paiman, Suriati Podder, Jiban Johan, Mohd Rafie QC Physics QD Chemistry In the present study, we have evaluated the gas sensing and photocatalytic activity of reduced graphene oxide (rGO) conjugated titanium dioxide (TiO2) nanoparticles (NPs) formed by the hydrothermal method. The assynthesized rGO-TiO2 nanocomposite were characterized for the physicochemical properties such as the nature of crystallinity, functionalization, and morphology by making use of the powder X-ray diffraction, Fourier transform-infrared spectroscopy, and scanning electron microscopy, respectively. On testing the gas sensing properties, we found that the rGO-TiO2 nanocomposite can serve as the chemoresistive-type sensor because of its sensitivity and selectivity towards different concentrations of hydrogen and oxygen at room temperature conditions. However, the rGO-TiO2 sensor's response and recovery speed towards hydrogen and oxygen needs further optimization. Test of photocatalytic activity of TiO2-rGO catalyst for the removal of two model contaminant dyes, RhB and MB showed effective removal, with respective degradation percentages of about 80 and 90% within the first 50 min of irradiation under visible light irradiation. Besides, MB was more effectively degraded using TiO2-rGO than pure TiO2 during the first 30 min of irradiation and this enhanced activity can be attributed to the increased capacity of light absorption, the efficiency of charge carriers separation, and the specific surface area maintained by the rGO-TiO2 nanocomposite to effectively utilize the photo-generated holes (h(+)) and superoxide radicals (O-2(-center dot)), responsible for the degradation of the dye. Based on the overall analysis, the formation of rGO-TiO2 nanocomposite can significantly improve the gas sensing and photocatalytic properties of TiO2 NPs and thus can be potential for practical applications in future nanotechnology. Elsevier 2021-10 Article PeerReviewed Sagadevan, Suresh and Lett, J. Anita and Weldegebrieal, Getu Kassegn and Biswas, Md Rokon Ud Dowla and Oh, Won Chun and Alshahateet, Solhe F. and Fatimah, Is and Mohammad, Faruq and Al-Lohedan, Hamad A. and Paiman, Suriati and Podder, Jiban and Johan, Mohd Rafie (2021) Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles. Chemical Physics Letters, 780. ISSN 0009-2614, DOI https://doi.org/10.1016/j.cplett.2021.138897 <https://doi.org/10.1016/j.cplett.2021.138897>. 10.1016/j.cplett.2021.138897
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	QC Physics QD Chemistry
spellingShingle	QC Physics QD Chemistry Sagadevan, Suresh Lett, J. Anita Weldegebrieal, Getu Kassegn Biswas, Md Rokon Ud Dowla Oh, Won Chun Alshahateet, Solhe F. Fatimah, Is Mohammad, Faruq Al-Lohedan, Hamad A. Paiman, Suriati Podder, Jiban Johan, Mohd Rafie Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles
description	In the present study, we have evaluated the gas sensing and photocatalytic activity of reduced graphene oxide (rGO) conjugated titanium dioxide (TiO2) nanoparticles (NPs) formed by the hydrothermal method. The assynthesized rGO-TiO2 nanocomposite were characterized for the physicochemical properties such as the nature of crystallinity, functionalization, and morphology by making use of the powder X-ray diffraction, Fourier transform-infrared spectroscopy, and scanning electron microscopy, respectively. On testing the gas sensing properties, we found that the rGO-TiO2 nanocomposite can serve as the chemoresistive-type sensor because of its sensitivity and selectivity towards different concentrations of hydrogen and oxygen at room temperature conditions. However, the rGO-TiO2 sensor's response and recovery speed towards hydrogen and oxygen needs further optimization. Test of photocatalytic activity of TiO2-rGO catalyst for the removal of two model contaminant dyes, RhB and MB showed effective removal, with respective degradation percentages of about 80 and 90% within the first 50 min of irradiation under visible light irradiation. Besides, MB was more effectively degraded using TiO2-rGO than pure TiO2 during the first 30 min of irradiation and this enhanced activity can be attributed to the increased capacity of light absorption, the efficiency of charge carriers separation, and the specific surface area maintained by the rGO-TiO2 nanocomposite to effectively utilize the photo-generated holes (h(+)) and superoxide radicals (O-2(-center dot)), responsible for the degradation of the dye. Based on the overall analysis, the formation of rGO-TiO2 nanocomposite can significantly improve the gas sensing and photocatalytic properties of TiO2 NPs and thus can be potential for practical applications in future nanotechnology.
format	Article
author	Sagadevan, Suresh Lett, J. Anita Weldegebrieal, Getu Kassegn Biswas, Md Rokon Ud Dowla Oh, Won Chun Alshahateet, Solhe F. Fatimah, Is Mohammad, Faruq Al-Lohedan, Hamad A. Paiman, Suriati Podder, Jiban Johan, Mohd Rafie
author_facet	Sagadevan, Suresh Lett, J. Anita Weldegebrieal, Getu Kassegn Biswas, Md Rokon Ud Dowla Oh, Won Chun Alshahateet, Solhe F. Fatimah, Is Mohammad, Faruq Al-Lohedan, Hamad A. Paiman, Suriati Podder, Jiban Johan, Mohd Rafie
author_sort	Sagadevan, Suresh
title	Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles
title_short	Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles
title_full	Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles
title_fullStr	Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles
title_full_unstemmed	Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles
title_sort	enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded tio2 nanoparticles
publisher	Elsevier
publishDate	2021
url	http://eprints.um.edu.my/34561/
_version_	1735409613897990144
score	13.211869

Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles

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