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

Scientific Reports
AbidShahab Ahmad

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 p...Continue Reading

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Citations

Jan 25, 2020·Beilstein Journal of Nanotechnology·Pallellappa ChithaiahC N R Rao
Oct 24, 2018·International Journal of Molecular Sciences·Diana F BecheruJorge S Burns
Jul 28, 2020·Sensors·Shu-Jung Chen, Bin Chen
Jun 5, 2021·ACS Applied Materials & Interfaces·Zhaolong ChenMaciej Koperski
Jun 10, 2021·Advanced Science·Fuad Indra Alzakia, Swee Ching Tan
Jun 23, 2021·Scientific Reports·Carmela BonavolontàMassimo Valentino
Jun 8, 2021·Nanotechnology·Panpailin SeeharajPattaraporn Kim-Lohsoontorn
Aug 10, 2021·Journal of Molecular Graphics & Modelling·L A De SouzaJ C Belchior
Jan 9, 2019·ACS Applied Materials & Interfaces·Muhammad Aniq Shazni Mohammad HaniffAbdul Manaf Hashim

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Methods Mentioned

BETA
irradiating
electron capture
electron scattering

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