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Issue 43, 2012
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The stability of “Ce2O3” nanodots in ambient conditions: a study using block copolymer templated structures

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Abstract

The stability of reduced cerium oxide in ambient conditions is clearly demonstrated in this paper. Well-defined, crystalline, cerium oxide nanodots (predominantly Ce4+ or Ce3+ material could be selectively prepared) were defined at silicon substrate surfaces by a method of block copolymer templating. Here, selective addition of the cerium ion into one block via solvent inclusion and subsequent UV/ozone processing resulted in the formation of well-separated, size mono-dispersed, oxide nanodots having a hexagonal arrangement mimicking that of the polymer nanopattern. The size of the dots could be varied in a facile manner by controlling the metal ion content. Synthesis and processing conditions could be varied to create nanodots which have a Ce2O3 type composition. The stability of the sesquioxide type structure under processing (synthesis) conditions and calcination was explored. Surprisingly, the sesquioxide type structure appears to be reasonably stable in ambient conditions with little evidence for extensive oxidation until heating to temperatures above ambient. Room temperature fluorescence is supposed to originate from a distribution of surface or defect states and depends on preparation conditions.

Graphical abstract: The stability of “Ce2O3” nanodots in ambient conditions: a study using block copolymer templated structures

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Publication details

The article was received on 30 Jul 2012, accepted on 21 Sep 2012 and first published on 24 Sep 2012


Article type: Paper
DOI: 10.1039/C2JM35073D
Citation: J. Mater. Chem., 2012,22, 22949-22957

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    The stability of “Ce2O3” nanodots in ambient conditions: a study using block copolymer templated structures

    T. Ghoshal, P. G. Fleming, J. D. Holmes and M. A. Morris, J. Mater. Chem., 2012, 22, 22949
    DOI: 10.1039/C2JM35073D

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