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Title: Structure Evolution of CdSe Nanocrystals During Ripening Process Studied by XAFS

Abstract

The structure evolution of CdSe nanocrystal with different grown sizes (1.9, 2.7 and 3.1 nm, respectively) obtained by size-selective method from colloidal solution is investigated by XAFS. By such purposeful design of samples, we have investigated the isolated ripening process effect on the structure of nanocrystals. The Se K-edge XAFS results of CdSe nanocrystals show that structure disorder of nanocrystal increases from 0.0046 Aa2 to 0.0053 (0.0072) Aa2 while its size grows from 1.9nm to 2.7 (3.1) nm during the ripening growth process. We propose that during ripening process the growth of CdSe nanocyrstal is through the deposition of Cd and Se ions on the surface of CdSe nucleate, and as a consequence, the defects on the nucleate surface lead to larger structural disorder of the resulting CdSe nanocrystal.

Authors:
; ; ;  [1]
  1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029 (China)
Publication Date:
OSTI Identifier:
21054746
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644666; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; CADMIUM SELENIDES; COLLOIDS; CRYSTAL GROWTH; CRYSTAL STRUCTURE; DEPOSITION; FINE STRUCTURE; NANOSTRUCTURES; SELENIUM IONS; SURFACES; X-RAY SPECTRA; X-RAY SPECTROSCOPY

Citation Formats

Zhang Xinfeng, Wei Feng, Yan Wensheng, and Wei Shiqiang. Structure Evolution of CdSe Nanocrystals During Ripening Process Studied by XAFS. United States: N. p., 2007. Web. doi:10.1063/1.2644666.
Zhang Xinfeng, Wei Feng, Yan Wensheng, & Wei Shiqiang. Structure Evolution of CdSe Nanocrystals During Ripening Process Studied by XAFS. United States. doi:10.1063/1.2644666.
Zhang Xinfeng, Wei Feng, Yan Wensheng, and Wei Shiqiang. Fri . "Structure Evolution of CdSe Nanocrystals During Ripening Process Studied by XAFS". United States. doi:10.1063/1.2644666.
@article{osti_21054746,
title = {Structure Evolution of CdSe Nanocrystals During Ripening Process Studied by XAFS},
author = {Zhang Xinfeng and Wei Feng and Yan Wensheng and Wei Shiqiang},
abstractNote = {The structure evolution of CdSe nanocrystal with different grown sizes (1.9, 2.7 and 3.1 nm, respectively) obtained by size-selective method from colloidal solution is investigated by XAFS. By such purposeful design of samples, we have investigated the isolated ripening process effect on the structure of nanocrystals. The Se K-edge XAFS results of CdSe nanocrystals show that structure disorder of nanocrystal increases from 0.0046 Aa2 to 0.0053 (0.0072) Aa2 while its size grows from 1.9nm to 2.7 (3.1) nm during the ripening growth process. We propose that during ripening process the growth of CdSe nanocyrstal is through the deposition of Cd and Se ions on the surface of CdSe nucleate, and as a consequence, the defects on the nucleate surface lead to larger structural disorder of the resulting CdSe nanocrystal.},
doi = {10.1063/1.2644666},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}