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Title: Magnetism in graphene oxide induced by epoxy groups

We have engineered magnetism in graphene oxide. Our approach transforms graphene into a magnetic insulator while maintaining graphene's structure. Fourier transform infrared spectroscopy spectra reveal that graphene oxide has various chemical groups (including epoxy, ketone, hydroxyl, and C-O groups) on its surface. Destroying the epoxy group with heat treatment or chemical treatment diminishes magnetism in the material. Local density approximation calculation results well reproduce the magnetic moments obtained from experiments, and these results indicate that the unpaired spin induced by the presence of epoxy groups is the origin of the magnetism. The calculation results also explain the magnetic properties, which are generated by the interaction between separated magnetic regions and domains. Our results demonstrate tunable magnetism in graphene oxide based on controlling the epoxy group with heat or chemical treatment.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [1] ;  [6]
  1. Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE (United Kingdom)
  2. (Singapore)
  3. Department of Physics and IPAP, Yonsei University, Seoul 120-749 (Korea, Republic of)
  4. (Korea, Republic of)
  5. Division of Materials Science, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
  6. (United States)
Publication Date:
OSTI Identifier:
22398965
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; CARBON OXIDES; DENSITY; EPOXIDES; FOURIER TRANSFORM SPECTROMETERS; GRAPHENE; HEAT; HEAT TREATMENTS; HYDROXIDES; KETONES; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETISM; SPIN; SURFACES