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Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis

Herein, we report the synthesis of few-layered graphene oxide (GO), reduced graphene oxide (rGO), and rGO/ZnO thin films on a glass substrate by the combination of spin coating, low temperature thermal annealing, and radio frequency (RF) sputtering. A spectroscopic approach was applied for the very...

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Main Authors:	Jilani, A., Othman, M. H. D., Ansari, M. O., Kumar, R., Alshahrie, A., Ismail, A. F., Khan, I. U., Sajith, V. K., Barakat, M. A.
Format:	Article
Published:	Royal Society of Chemistry 2017
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/76993/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-85034856042&doi=10.1039%2fc7nj03614k&partnerID=40&md5=6f438ad434e12dee7c52abb5ebfc4c15
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spelling	my.utm.769932018-04-30T14:32:18Z http://eprints.utm.my/id/eprint/76993/ Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis Jilani, A. Othman, M. H. D. Ansari, M. O. Kumar, R. Alshahrie, A. Ismail, A. F. Khan, I. U. Sajith, V. K. Barakat, M. A. TP Chemical technology Herein, we report the synthesis of few-layered graphene oxide (GO), reduced graphene oxide (rGO), and rGO/ZnO thin films on a glass substrate by the combination of spin coating, low temperature thermal annealing, and radio frequency (RF) sputtering. A spectroscopic approach was applied for the very first time to calculate the optical and dielectric properties of GO thin films. The GO thin film was characterised for structural, optical, morphological, and surface chemical state composition properties by X-ray diffraction, UV-visible spectroscopy, atomic force microscopy, field emission scanning electron microscopy, and X-ray photoelectron microscopy. The chemical state analysis of O1s and C1s spectra evidently proved the successful reduction of GO at 200-300 °C. The change in grain size, lattice strain, and dislocation density was studied after the reduction of GO to rGO, and the band gap analysis was performed through Tauc plot relation. The optical conductivity of the GO films was estimated by the UV technique. Moreover, the dielectric constant and dielectric loss of GO and rGO thin films were also studied, and the samples annealed at high temperature showed comparatively low loss. Due to the high conductivity and low band gap of few-layered rGO, its composite with RF-sputtered ZnO (rGO/ZnO) was studied for its ability to photocatalytically degrade 2-chlorophenol. Royal Society of Chemistry 2017 Article PeerReviewed Jilani, A. and Othman, M. H. D. and Ansari, M. O. and Kumar, R. and Alshahrie, A. and Ismail, A. F. and Khan, I. U. and Sajith, V. K. and Barakat, M. A. (2017) Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis. New Journal of Chemistry, 41 (23). pp. 14217-14227. ISSN 1144-0546 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85034856042&doi=10.1039%2fc7nj03614k&partnerID=40&md5=6f438ad434e12dee7c52abb5ebfc4c15 DOI:10.1039/c7nj03614k
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TP Chemical technology
spellingShingle	TP Chemical technology Jilani, A. Othman, M. H. D. Ansari, M. O. Kumar, R. Alshahrie, A. Ismail, A. F. Khan, I. U. Sajith, V. K. Barakat, M. A. Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis
description	Herein, we report the synthesis of few-layered graphene oxide (GO), reduced graphene oxide (rGO), and rGO/ZnO thin films on a glass substrate by the combination of spin coating, low temperature thermal annealing, and radio frequency (RF) sputtering. A spectroscopic approach was applied for the very first time to calculate the optical and dielectric properties of GO thin films. The GO thin film was characterised for structural, optical, morphological, and surface chemical state composition properties by X-ray diffraction, UV-visible spectroscopy, atomic force microscopy, field emission scanning electron microscopy, and X-ray photoelectron microscopy. The chemical state analysis of O1s and C1s spectra evidently proved the successful reduction of GO at 200-300 °C. The change in grain size, lattice strain, and dislocation density was studied after the reduction of GO to rGO, and the band gap analysis was performed through Tauc plot relation. The optical conductivity of the GO films was estimated by the UV technique. Moreover, the dielectric constant and dielectric loss of GO and rGO thin films were also studied, and the samples annealed at high temperature showed comparatively low loss. Due to the high conductivity and low band gap of few-layered rGO, its composite with RF-sputtered ZnO (rGO/ZnO) was studied for its ability to photocatalytically degrade 2-chlorophenol.
format	Article
author	Jilani, A. Othman, M. H. D. Ansari, M. O. Kumar, R. Alshahrie, A. Ismail, A. F. Khan, I. U. Sajith, V. K. Barakat, M. A.
author_facet	Jilani, A. Othman, M. H. D. Ansari, M. O. Kumar, R. Alshahrie, A. Ismail, A. F. Khan, I. U. Sajith, V. K. Barakat, M. A.
author_sort	Jilani, A.
title	Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis
title_short	Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis
title_full	Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis
title_fullStr	Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis
title_full_unstemmed	Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis
title_sort	facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis
publisher	Royal Society of Chemistry
publishDate	2017
url	http://eprints.utm.my/id/eprint/76993/ https://www.scopus.com/inward/record.uri?eid=2-s2.0-85034856042&doi=10.1039%2fc7nj03614k&partnerID=40&md5=6f438ad434e12dee7c52abb5ebfc4c15
_version_	1643657467308015616
score	13.211869

Facile spectroscopic approach to obtain the optoelectronic properties of few-layered graphene oxide thin films and their role in photocatalysis

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