Graphene induced band gap widening and luminescence quenching in ceria:graphene nanocomposites

By this report, we discussed about the synthesis and optical properties of pure ceria (nanospheres) and ceria:graphene nanocomposites (nanorice like morphology) which were prepared by using commercial microwave oven as a cost effective and environmental friendly approach. The influence of graphene o...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-01, Vol.770, p.1221-1228
Main Authors: Udayabhaskar, R., Mangalaraja, R.V., Sahlevani, Saeed Farhang, Perarasu, V.T., Karthikeyan, B., Contreras, David, Gracia-Pinilla, M.A.
Format: Article
Language:English
Subjects:
Blue shift
Carbon
Ceria:graphene
Cerium oxides
Crystallites
Energy gap
F-centers
Graphene
Luminescence
Morphology
Nanoceria
Nanocomposites
Nanospheres
Optical properties
Quenching
Raman spectra
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Summary:By this report, we discussed about the synthesis and optical properties of pure ceria (nanospheres) and ceria:graphene nanocomposites (nanorice like morphology) which were prepared by using commercial microwave oven as a cost effective and environmental friendly approach. The influence of graphene on the crystallinity, morphology, band gap energy and luminescence of the synthesized samples were deliberately discussed. The obtained average crystallite size, by using Scherrer formula, of the CeO2 nanostructures exhibited a decreasing trend with increasing the graphene loading. The higher graphene loaded ceria nanocomposites clearly depicted the morphology of nanorice like in shape with the diameter and length as ∼ 6 and ∼ 50 nm, respectively. The presence of graphene and ceria related vibrational modes in FTIR and Raman spectra along with the structural studies supported the successful formation of the nanocomposites. The observed increase in the band gap (blue shift) of nanoceria was discussed. The luminescence related to various F-centers and its quenching in the ceria nanocomposites was discussed. •The crystallization of ceria nanostructures is ultrafast (≤2 min).•Graphene induced changes in morphology from nanospheres to nano-rice.•Decrease in crystallite size and presence of Ce3+ led to widening of bandgap.•Luminescence in the visible range due to the various F-centers (oxygen vacancies).•Graphene induced extra non-radiative pathways in the composites led to quenching.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.08.226