On the roles of graphene oxide doping for enhanced supercurrent in MgB <inf>2</inf> based superconductors

Yeoh, WK; Cui, XY; Gault, B; De Silva, KSB; Xu, X; Liu, HW; Yen, HW; Wong, D; Bao, P; Larson, DJ; Martin, I; Li, WX; Zheng, RK; Wang, XL; Dou, SX; Ringer, SP

On the roles of graphene oxide doping for enhanced supercurrent in MgB <inf>2</inf> based superconductors

Yeoh, WK Cui, XY Gault, B De Silva, KSB

Xu, X Liu, HW Yen, HW Wong, D Bao, P Larson, DJ Martin, I Li, WX Zheng, RK Wang, XL Dou, SX Ringer, SP

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Publication Type:: Journal Article
Citation:: Nanoscale, 2014, 6 (11), pp. 6166 - 6172
Issue Date:: 2014-06-07

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Field	Value	Language
dc.contributor.author	Yeoh, WK	en_US
dc.contributor.author	Cui, XY	en_US
dc.contributor.author	Gault, B	en_US
dc.contributor.author	De Silva, KSB https://orcid.org/0000-0002-3242-4858	en_US
dc.contributor.author	Xu, X	en_US
dc.contributor.author	Liu, HW	en_US
dc.contributor.author	Yen, HW	en_US
dc.contributor.author	Wong, D	en_US
dc.contributor.author	Bao, P	en_US
dc.contributor.author	Larson, DJ	en_US
dc.contributor.author	Martin, I	en_US
dc.contributor.author	Li, WX	en_US
dc.contributor.author	Zheng, RK	en_US
dc.contributor.author	Wang, XL	en_US
dc.contributor.author	Dou, SX	en_US
dc.contributor.author	Ringer, SP	en_US
dc.date.issued	2014-06-07	en_US
dc.identifier.citation	Nanoscale, 2014, 6 (11), pp. 6166 - 6172	en_US
dc.identifier.issn	2040-3364	en_US
dc.identifier.uri	http://hdl.handle.net/10453/42027
dc.description.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.	en_US
dc.relation.ispartof	Nanoscale	en_US
dc.relation.isbasedon	10.1039/c4nr00415a	en_US
dc.subject.classification	Nanoscience & Nanotechnology	en_US
dc.title	On the roles of graphene oxide doping for enhanced supercurrent in MgB <inf>2</inf> based superconductors	en_US
dc.type	Journal Article
utslib.citation.volume	11	en_US
utslib.citation.volume	6	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0306 Physical Chemistry (incl. Structural)	en_US
utslib.for	02 Physical Sciences	en_US
utslib.for	03 Chemical Sciences	en_US
utslib.for	10 Technology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	11	en_US
pubs.publication-status	Published	en_US
pubs.volume	6	en_US

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.

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http://hdl.handle.net/10453/42027