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Title: Microwave plasma based single step method for free standing graphene synthesis at atmospheric conditions

Microwave atmospheric pressure plasmas driven by surface waves were used to synthesize graphene sheets from vaporized ethanol molecules carried through argon plasma. In the plasma, ethanol decomposes creating carbon atoms that form nanostructures in the outlet plasma stream, where external cooling/heating was applied. It was found that the outlet gas stream temperature plays an important role in the nucleation processes and the structural quality of the produced nanostructures. The synthesis of few layers (from one to five) graphene has been confirmed by high-resolution transmission electron microscopy. Raman spectral studies were conducted to determine the ratio of the 2D to G peaks (>2). Disorder D-peak to G-peak intensity ratio decreases when outlet gas stream temperature decreases.
Authors:
; ; ;  [1] ; ;  [2] ;  [3]
  1. Institute of Plasmas and Nuclear Fusion, Instituto Superior T├ęcnico, Technical University of Lisbon (Portugal)
  2. Department of Mechanical and Aerospace Engineering, Naval Postgraduate School, Monterey, California 93943 (United States)
  3. Faculty of Physics, Sofia University, 1164 Sofia (Bulgaria)
Publication Date:
OSTI Identifier:
22217975
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 13; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ARGON; ATMOSPHERIC PRESSURE; COOLING; ETHANOL; FABRICATION; GRAPHENE; HEATING; LAYERS; MICROWAVE RADIATION; NANOSTRUCTURES; NUCLEATION; PEAKS; PLASMA; RAMAN SPECTRA; TRANSMISSION ELECTRON MICROSCOPY