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On the roles of graphene oxide doping for enhanced supercurrent in MgB 2 based superconductors
Australian Institute for Innovative Materials - Papers
  • W K Yeoh, University of Wollongong
  • X Y Cui, University of Sydney
  • B Gault, University of Sydney
  • K S. B De Silva, University of Wollongong
  • X Xu, University of Wollongong
  • H W Liu, University of Sydney
  • H. -W Yen, University of Sydney
  • D Wong, University of Sydney
  • P Bao, University of Sydney
  • D J Larson, CAMECA Instruments
  • I Martin, CAMECA Instruments
  • W X Li, University of Wollongong
  • R K Zheng, University of Sydney
  • X L Wang, University of Wollongong
  • S X Dou, University of Wollongong
  • S P Ringer, University of Sydney
RIS ID
90567
Publication Date
1-1-2014
Publication Details

Yeoh, W. K., Cui, X. Y., Gault, B., De Silva, K. S. B., Xu, X., Liu, H. W., Yen, H., Wong, D., Bao, P., Larson, D. J., Martin, I., Li, W. X., Zheng, R. K., Wang, X. L., Dou, S. X. & Ringer, S. P. (2014). On the roles of graphene oxide doping for enhanced supercurrent in MgB 2 based superconductors. Nanoscale, 6 (11), 6166-6172.

Abstract
Due to their graphene-like properties after oxygen reduction, incorporation of graphene oxide (GO) sheets into correlated-electron materials offers a new pathway for tailoring their properties. Fabricating GO nanocomposites with polycrystalline MgB2 superconductors leads to an order of magnitude enhancement of the supercurrent at 5 K/8 T and 20 K/4 T. Herein, we introduce a novel experimental approach to overcome the formidable challenge of performing quantitative microscopy and microanalysis of such composites, so as to unveil how GO doping influences the structure and hence the material properties. Atom probe microscopy and electron microscopy were used to directly image the GO within the MgB2, and we combined these data with computational simulations to derive the property-enhancing mechanisms. Our results reveal synergetic effects of GO, namely, via localized atomic (carbon and oxygen) doping as well as texturing of the crystals, which provide both inter- and intra-granular flux pinning. This study opens up new insights into how low-dimensional nanostructures can be integrated into composites to modify the overall properties, using a methodology amenable to a wide range of applications.
Grant Number
ARC/LP120100173
Citation Information
W K Yeoh, X Y Cui, B Gault, K S. B De Silva, et al.. "On the roles of graphene oxide doping for enhanced supercurrent in MgB 2 based superconductors" (2014) p. 6166 - 6172
Available at: http://works.bepress.com/sxdou/605/