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Title: Interaction of graphene quantum dots with bulk semiconductor surfaces

Highly luminescent graphene quantum dots (GQDs) are synthesized through thermolysis of glucose. The average lateral size of the synthesized GQDs is found to be ∼5 nm. The occurrence of D and G band at 1345 and 1580 cm{sup −1} in Raman spectrum confirms the presence of graphene layers. GQDs are mostly consisting of 3 to 4 graphene layers as confirmed from the AFM measurements. Photoluminescence (PL) measurement shows a distinct broadening of the spectrum when GQDs are on the semiconducting bulk surface compared to GQDs in water. The time resolved PL measurement shows a significant shortening in PL lifetime due to the substrate interaction on GQDs compared to the GQDs in solution phase.
Authors:
;  [1] ; ;  [2]
  1. Department of physics, IIT Bombay, Mumbai-400076 (India)
  2. Centre for Research in Nanotechnology and Science, IIT Bombay-400076, Mumbai (India)
Publication Date:
OSTI Identifier:
22391757
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1661; Journal Issue: 1; Conference: ICCMP 2014: International Conference on Condensed Matter Physics 2014, Shimla (India), 4-6 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 77 NANOSCIENCE AND NANOTECHNOLOGY; ATOMIC FORCE MICROSCOPY; COMPARATIVE EVALUATIONS; GLUCOSE; GRAPHENE; LAYERS; LIFETIME; PHOTOLUMINESCENCE; QUANTUM DOTS; RAMAN SPECTRA; SEMICONDUCTOR MATERIALS; SUBSTRATES; SURFACES; TIME RESOLUTION; WATER