Type

Journal Article

Authors

Michael A. Morris
Justin D. Holmes
Peter A. Fleming
Tandra Ghoshal

Subjects

Chemistry

Topics
block copolymers oxides synthesis and processing surface defects cerium calcination metal ions cerium compounds

The stability of “Ce2O3” nanodots in ambient conditions: a study using block copolymer templated structures (2012)

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.
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Full list of authors on original publication

Michael A. Morris, Justin D. Holmes, Peter A. Fleming, Tandra Ghoshal

Experts in our system

1
Michael A. Morris
University College Cork
Total Publications: 164
 
2
Justin D. Holmes
University College Cork
Total Publications: 287
 
3
Tandra Ghoshal
University College Cork
Total Publications: 32