Linked Life Data

15656206

Source:http://linkedlifedata.com/resource/pubmed/id/15656206

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
2005-1-19
pubmed:abstractText
Metastable nanoclusters of ZnO semiconductor crystallites, 20 to 30 nm diameter, are synthesized by a reconstructive decomposition of a polymer precursor of dispersed Zn2+ cations in poly vinyl alcohol (PVA) polymer molecules. They have EPR (electron paramagnetic resonance) spectrum of distinct excitonic features. Multiple EPR bands appear in prominent intensities in oxygen vacancies VO+ and singly ionized Oi- and Zn(i)+ interstitials. A paramagnetic VO+ vacancy derives from usual diamagnetic O2- vacancy of VO++ (behaves as if doubly charged compared to the lattice) by addition of one electron. The results demonstrate the existence of a surface-interface or surface barrier layer in free-carrier depletion at the crystallite surface in the clusters and its effects on the Oi- and Zn(i)+ ionization states (determine green photoluminescence). Both VO+ and Zn(i)+ are curable by a thermal annealing in O2 gas. A cured sample of equilibrium structure achieved by heating at approximately 550 degrees C has a single EPR in Oi- at g = 1.990. The results are useful in understanding their correlation with EPR and optical properties in ZnO semiconductors and devices.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
1533-4880
pubmed:author
pubmed:issnType
Print
pubmed:volume
4
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1076-80
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Synthesis and unusual electron paramagnetic resonance spectrum of metastable nanoclusters of ZnO semiconductor crystallites.
pubmed:affiliation
Material Science Centre, Indian Institute of Technology, Kharagpur 721 302, India.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't