Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency

Abstract We report a facile and cost-effective approach to develop self-standing reduced Graphene Oxide (rGO) film based optical sensor and its low-temperature performance analysis where midgap defect states play a key role in tuning the crucial sensor parameters. Graphite oxide (GO) is produced by...

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Autores principales:	Abid, Poonam Sehrawat, S. S. Islam, Prabhash Mishra, Shahab Ahmad
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/310a9a08b5f4402dab03bf476d2feb23
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spelling	oai:doaj.org-article:310a9a08b5f4402dab03bf476d2feb232021-12-02T11:40:16ZReduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency10.1038/s41598-018-21686-22045-2322https://doaj.org/article/310a9a08b5f4402dab03bf476d2feb232018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-21686-2https://doaj.org/toc/2045-2322Abstract We report a facile and cost-effective approach to develop self-standing reduced Graphene Oxide (rGO) film based optical sensor and its low-temperature performance analysis where midgap defect states play a key role in tuning the crucial sensor parameters. Graphite oxide (GO) is produced by modified Hummers’ method and reduced thermally at 250 °C for 1 h in Argon atmosphere to obtain rGO. Self-standing rGO film is prepared via vacuum filtration. The developed film is characterized by HRTEM, FESEM, Raman, and XRD techniques. The developed sensor exhibits highest sensitivity towards 635 nm illumination wavelength, irrespective of the operating temperature. For a given excitation wavelength, photoresponse study at low temperature (123K–303K) reveals inverse relationship between sensitivity and operating temperature. Highest sensitivity of 49.2% is obtained at 123 K for 635 nm laser at power density of 1.4 mW/mm2. Unlike sensitivity, response- and recovery-time demonstrate directly proportional dependence with operating temperature. Power dependent studies establish linear relation between power-density and sensitivity, and a safe limit beyond which sample heating prolongs the recovery time. Wavelength-dependent studies shows that proposed sensor can efficiently operate from visible to near NIR region. To the best of our knowledge such rGO based optical sensor performance at low temperature had not been reported earlier.AbidPoonam SehrawatS. S. IslamPrabhash MishraShahab AhmadNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-13 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Abid Poonam Sehrawat S. S. Islam Prabhash Mishra Shahab Ahmad Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency
description	Abstract We report a facile and cost-effective approach to develop self-standing reduced Graphene Oxide (rGO) film based optical sensor and its low-temperature performance analysis where midgap defect states play a key role in tuning the crucial sensor parameters. Graphite oxide (GO) is produced by modified Hummers’ method and reduced thermally at 250 °C for 1 h in Argon atmosphere to obtain rGO. Self-standing rGO film is prepared via vacuum filtration. The developed film is characterized by HRTEM, FESEM, Raman, and XRD techniques. The developed sensor exhibits highest sensitivity towards 635 nm illumination wavelength, irrespective of the operating temperature. For a given excitation wavelength, photoresponse study at low temperature (123K–303K) reveals inverse relationship between sensitivity and operating temperature. Highest sensitivity of 49.2% is obtained at 123 K for 635 nm laser at power density of 1.4 mW/mm2. Unlike sensitivity, response- and recovery-time demonstrate directly proportional dependence with operating temperature. Power dependent studies establish linear relation between power-density and sensitivity, and a safe limit beyond which sample heating prolongs the recovery time. Wavelength-dependent studies shows that proposed sensor can efficiently operate from visible to near NIR region. To the best of our knowledge such rGO based optical sensor performance at low temperature had not been reported earlier.
format	article
author	Abid Poonam Sehrawat S. S. Islam Prabhash Mishra Shahab Ahmad
author_facet	Abid Poonam Sehrawat S. S. Islam Prabhash Mishra Shahab Ahmad
author_sort	Abid
title	Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency
title_short	Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency
title_full	Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency
title_fullStr	Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency
title_full_unstemmed	Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency
title_sort	reduced graphene oxide (rgo) based wideband optical sensor and the role of temperature, defect states and quantum efficiency
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/310a9a08b5f4402dab03bf476d2feb23
work_keys_str_mv	AT abid reducedgrapheneoxidergobasedwidebandopticalsensorandtheroleoftemperaturedefectstatesandquantumefficiency AT poonamsehrawat reducedgrapheneoxidergobasedwidebandopticalsensorandtheroleoftemperaturedefectstatesandquantumefficiency AT ssislam reducedgrapheneoxidergobasedwidebandopticalsensorandtheroleoftemperaturedefectstatesandquantumefficiency AT prabhashmishra reducedgrapheneoxidergobasedwidebandopticalsensorandtheroleoftemperaturedefectstatesandquantumefficiency AT shahabahmad reducedgrapheneoxidergobasedwidebandopticalsensorandtheroleoftemperaturedefectstatesandquantumefficiency
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Reduced graphene oxide (rGO) based wideband optical sensor and the role of Temperature, Defect States and Quantum Efficiency

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