期刊
MATERIALS LETTERS
卷 89, 期 -, 页码 316-319出版社
ELSEVIER
DOI: 10.1016/j.matlet.2012.08.143
关键词
Nanocrystalline materials; Semiconductors; Chemical synthesis; Electron microscopy; Crystal structure; Optical properties
资金
- Higher Education Commission of Pakistan
- Swedish Research Council
In this work we report results from microwave (MW) assisted synthesis of highly crystalline ZnS quantum dots (QDs) using ionic liquid (ILs) as MW absorbing medium. Two types of ionic liquids, imidazolium and phosphonium based, were used. The QDs are less than 5 nm in size and of wurtzite ZnS type, as characterized by high-resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) pattern. The optical properties were investigated by UV-vis absorption and show a blue shift in absorption as compared to bulk wurtzite ZnS due to quantum confinement effects. The photoluminescence (PL) spectra of the QDs show different trap state emissions. (C) 2012 Elsevier B.V. All rights reserved.
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