Skip to main content

On the roles of graphene oxide doping for enhanced supercurrent in MgB 2 based superconductors

Journal Article


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. © 2014 the Partner Organisations.

Authors


  •   Yeoh, Wai Kong (external author)
  •   Cui, Xiangyuan (external author)
  •   Gault, Baptiste (external author)
  •   De Silva, Kaludewa Sujeewa Buddhimali. (external author)
  •   Xu, Xun
  •   Liu, Huan-Wen (external author)
  •   Yen, H W. (external author)
  •   Wong, Derek Chi Kian (external author)
  •   Bao, Peite (external author)
  •   Larson, D J. (external author)
  •   Martin, Iain (external author)
  •   Li, W (external author)
  •   Zheng, Rongkun (external author)
  •   Wang, Xiaolin
  •   Dou, Shi Xue
  •   Ringer, Simon Peter. (external author)

Publication Date


  • 2014

Citation


  • 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.

Scopus Eid


  • 2-s2.0-84901008839

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1084

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 6166

End Page


  • 6172

Volume


  • 6

Issue


  • 11

Place Of Publication


  • United Kingdom

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. © 2014 the Partner Organisations.

Authors


  •   Yeoh, Wai Kong (external author)
  •   Cui, Xiangyuan (external author)
  •   Gault, Baptiste (external author)
  •   De Silva, Kaludewa Sujeewa Buddhimali. (external author)
  •   Xu, Xun
  •   Liu, Huan-Wen (external author)
  •   Yen, H W. (external author)
  •   Wong, Derek Chi Kian (external author)
  •   Bao, Peite (external author)
  •   Larson, D J. (external author)
  •   Martin, Iain (external author)
  •   Li, W (external author)
  •   Zheng, Rongkun (external author)
  •   Wang, Xiaolin
  •   Dou, Shi Xue
  •   Ringer, Simon Peter. (external author)

Publication Date


  • 2014

Citation


  • 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.

Scopus Eid


  • 2-s2.0-84901008839

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1084

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 6166

End Page


  • 6172

Volume


  • 6

Issue


  • 11

Place Of Publication


  • United Kingdom