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Growth of dumbbell-like ZnO microcrystals under mild conditions and their photoluminescence properties.
MedLine Citation:
PMID:  17602609     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Large-scale uniform dumbbell-like ZnO microcrystals were successfully synthesized via a facile solution method under mild conditions. The as-prepared dumbbells, with lengths of 3.5-5.4 microm and diameters of 1.3-1.8 microm, possess a single-crystal hexagonal structure and grow along the [0001] direction. The influence of the reactant concentration on the size and shapes of the ZnO samples had been studied, and the results revealed that the reactant concentration plays a crucial role in determining final morphologies of the samples. Moreover, the evolution process of the dumbbell-like ZnO microcrystals was viewed by field-emission scanning electron microscopy (FE-SEM) characterization, and a possible formation mechanism was proposed. In addition, optical properties of the ZnO samples prepared at different reaction times were also investigated by photoluminescence (PL) spectroscopy. The room-temperature PL spectrum of the dumbbell-like ZnO microcrystals shows a strong UV emission peak. The UV emission is further identified to originate from the radiative free-exciton recombination by the temperature-dependent PL.
Authors:
Qingjiang Yu; Cuiling Yu; Haibin Yang; Wuyou Fu; Lianxia Chang; Jing Xu; Ronghui Wei; Hongdong Li; Hongyang Zhu; Minghui Li; Guangtian Zou; Guorui Wang; Changlu Shao; Yichun Liu
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Publication Detail:
Type:  Journal Article     Date:  2007-06-30
Journal Detail:
Title:  Inorganic chemistry     Volume:  46     ISSN:  0020-1669     ISO Abbreviation:  Inorg Chem     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-07-16     Completed Date:  2007-08-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0366543     Medline TA:  Inorg Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6204-10     Citation Subset:  -    
Affiliation:
National Laboratory of Superhard Materials, Jilin University, Changchun, 130012, P. R. China.
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