Anchoring Ceria Nanoparticles on Reduced Graphene Oxide and Their Electronic Transport Properties

We report a simple scheme of anchoring crystalline ceria nanoparticles (CNPs) onto reduced graphene oxide (RGO) sheets. Two types of CNPs, consisting of predominantly either Ce3+ or Ce4+ valence states, were mixed with GO suspended in water, with simultaneous reduction using hydrazine to yield CNP/R...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2011-12, Vol.115 (50), p.24494-24500
Main Authors: Joung, Daeha, Singh, Virendra, Park, Sanghoon, Schulte, Alfons, Seal, Sudipta, Khondaker, Saiful I
Format: Article
Language:English
Subjects:
C: Nanops and Nanostructures
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Summary:We report a simple scheme of anchoring crystalline ceria nanoparticles (CNPs) onto reduced graphene oxide (RGO) sheets. Two types of CNPs, consisting of predominantly either Ce3+ or Ce4+ valence states, were mixed with GO suspended in water, with simultaneous reduction using hydrazine to yield CNP/RGO composite. Structural and surface characterizations reveal a strong electrostatic interaction between the CNPs and the RGO. Electrical characterizations show that with increased oxygen vacancies from Ce4+ to Ce3+ states the predominantly ambipolar RGO transforms to n-type CNP/RGO composites due to the electrostatic interaction between the localized electrons in oxygen vacancy sites of CNPs and mobile holes in RGO.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp206485v