ENHANCEMENT OF REDUCED GRAPHENE OXIDE BOLOMETRIC PHOTORESPONSE VIA ADDITION OF GRAPHENE QUANTUM DOTS

S. Lai, M. Chen, Yu. N. Khanin, K. S. Novoselov and D. V. Andreeva
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S. Lai: Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
M. Chen: Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
Yu. N. Khanin: #x2020;Institute for Microelectronics Technology, Russian Academy of Sciences, Chernogolovka 142432, Russia
K. S. Novoselov: Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore‡Centre for Advanced 2D Materials, National University of Singapore, Singapore 117546, Singapore§National Graphene Institute, University of Manchester, Oxford Road, Manchester M13 9PL, UK¶Chongqing 2D Materials Institute, Liangjiang New Area, Chongqing 400714, China
D. V. Andreeva: Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore‡Centre for Advanced 2D Materials, National University of Singapore, Singapore 117546, Singapore

Surface Review and Letters (SRL), 2021, vol. 28, issue 08, 1-7

Abstract: Reduced graphene oxide (rGO) has attracted interest in its potential application in large area photodetectors owing to its ease of manufacture and wideband optical absorbance. Here, we report that thin rGO films produced via vacuum filtration of GO followed by reduction by immersion in L-ascorbic acid are capable of sensing light through a bolometric mechanism. The photoresponse of these rGO thin films can be further enhanced by dropcasting graphene quantum dots (GQDs) on the rGO surface. These GQDs were observed to increase the opacity of the rGO film and hence its absorptivity of light, thereby enabling a significant increase in the photoresponse of the device.

Keywords: Graphene; graphene oxide; quantum dots; photodetector (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21400114

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