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 as-synthesized rGO-TiO2 nanocomposite were characterized for the physicochemical propertie...

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Main Authors: Sagadevan, Suresh, Lett, J. Anita, Weldegebrieal, Getu Kassegn, Biswas, Md Rokonud Dowla, Oh, Won Chun, Alshahateet, Solhe F., Fatimah, Is, Mohammad, Faruq, Al-Lohedan, Hamad A., Paiman, Suriati, Podder, Jiban, Johan, Mohd Rafie
Format: Article
Language:English
Published: Elsevier 2021
Online Access:http://psasir.upm.edu.my/id/eprint/97089/1/ABSTRACT.pdf
http://psasir.upm.edu.my/id/eprint/97089/
https://www.sciencedirect.com/science/article/pii/S0009261421005807
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Institution: Universiti Putra Malaysia
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spelling my.upm.eprints.970892022-09-14T01:31:54Z http://psasir.upm.edu.my/id/eprint/97089/ Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles Sagadevan, Suresh Lett, J. Anita Weldegebrieal, Getu Kassegn Biswas, Md Rokonud Dowla Oh, Won Chun Alshahateet, Solhe F. Fatimah, Is Mohammad, Faruq Al-Lohedan, Hamad A. Paiman, Suriati Podder, Jiban Johan, Mohd Rafie 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 as-synthesized 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 (O2−radical 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 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/97089/1/ABSTRACT.pdf Sagadevan, Suresh and Lett, J. Anita and Weldegebrieal, Getu Kassegn and Biswas, Md Rokonud 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. art. no. 138897. pp. 1-11. ISSN 0009-2614 https://www.sciencedirect.com/science/article/pii/S0009261421005807 10.1016/j.cplett.2021.138897
institution Universiti Putra Malaysia
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content_provider Universiti Putra Malaysia
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language English
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 as-synthesized 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 (O2−radical 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 Rokonud Dowla
Oh, Won Chun
Alshahateet, Solhe F.
Fatimah, Is
Mohammad, Faruq
Al-Lohedan, Hamad A.
Paiman, Suriati
Podder, Jiban
Johan, Mohd Rafie
spellingShingle Sagadevan, Suresh
Lett, J. Anita
Weldegebrieal, Getu Kassegn
Biswas, Md Rokonud 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
author_facet Sagadevan, Suresh
Lett, J. Anita
Weldegebrieal, Getu Kassegn
Biswas, Md Rokonud 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://psasir.upm.edu.my/id/eprint/97089/1/ABSTRACT.pdf
http://psasir.upm.edu.my/id/eprint/97089/
https://www.sciencedirect.com/science/article/pii/S0009261421005807
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