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Size‐Dependent Crystal Properties of Nanocuprite
Author(s) -
Song Junhua,
Rodenbough Philip P.,
Zhang Lihua,
Chan SiuWai
Publication year - 2015
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12486
Subject(s) - cuprite , materials science , crystallite , copper , bond length , crystal (programming language) , crystal structure , particle size , nanoparticle , lattice constant , oxide , crystallography , analytical chemistry (journal) , chemistry , nanotechnology , metallurgy , diffraction , optics , physics , chromatography , computer science , programming language
Cuprite nanoparticles from 9 nm to 1 μm with narrow size distribution (±7%) are prepared by two different methods. The lattice parameter increases up to 0.2% as the crystallite size decreases to 9 nm from micron size. X‐ray Absorption Near Edge Spectroscope study of our copper oxide nanoparticles shows mostly Cu (I) with increasing concentration of Cu ( II ) as decreasing crystal sizes. The size effect in Cu( II )/Cu(I) ratio indicates that at smaller crystal size, the Cu 2 O tends to be more oxidized at higher charge state with Cu(I)‐O bond. Thus, the lattice expansion can be explained by the presence of longer Cu ( II )‐O bond than Cu (I)‐O bond and/or oxygen interstitials in nanocuprite.