Singh, Neelam and Kothari, Deepak and Ansari, Jamilur R and Pal, Mrinal and Mandal, Sankar and Dhara, Sandip and Datta, Anindya (2019) Light-Induced Tunable n-Doping of Ag-Embedded GO/RGO Sheets in Polymer Matrix. Journal of Physical Chemistry C, 123 (16). pp. 10557-10563. ISSN 1932-7447

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A series of composites were synthesized having graphene oxide (GO)/reduced graphene oxide (RGO), decorated with Ag halide within inert poly(vinyl alcohol) (PVA) matrix. A calculated amount of cuprous iodide was also synthesized with Ag halide. On exposure to light, due to the photochromic effect, Ag halide converts into Ag nanoparticles as a donor, whereas cuprous iodide acts as a hole trapper to introduce a band gap in graphene. With increasing exposure time, the Ag nanoparticles increase in size and number and composites become increasingly dark. The appearance of the plasmonic peak in ultraviolet-visible plots after exposure to light confirms the presence of Ag nanoparticles in these composites. The apparent red shift of the surface plasmon resonance peak, reduction of its intensity, and broadening of the peak are dependent on the dielectric constant of the surrounding matrix and the distance between the GO/RGO sheet and the Ag nanoparticles. The increasing number and size of Ag nanoparticles introduce tunable n-type doping in the GO/RGO PVA composites, as determined directly by Raman spectroscopy, without the necessity of electrically gated device.

Item Type: Article
Subjects: Engineering Materials
Divisions: Sensor and Actuator
Depositing User: Bidhan Chaudhuri
Date Deposited: 20 Nov 2019 11:01
Last Modified: 20 Nov 2019 11:01

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