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Title: Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis

Abstract

In the last two decades, the field of nanoscience andnanotechnology has witnessed tremendous advancement in the synthesis andapplication of group II-VI colloidal nanocrystals. The synthesis based onhigh temperature decomposition of organometallic precursors has becomeone of the most successful methods of making group II-VI colloidalnanocrystals. This methodis first demonstrated by Bawendi and coworkersin 1993 to prepare cadmium chalcogenide colloidal quantum dots and laterextended by others to prepare other group II-VI quantum dots as well asanisotropic shaped colloidal nanocrystals, such as nanorod and tetrapod.This dissertation focuses on the chemistry of this type of nanocrystalsynthesis. The synthesis of group II-VI nanocrystals was studied bycharacterizing the molecular structures of the precursors and productsand following their time evolution in the synthesis. Based on theseresults, a mechanism was proposed to account for the 2 reaction betweenthe precursors that presumably produces monomer for the growth ofnanocrystals. Theoretical study based on density functional theorycalculations revealed the detailed free energy landscape of the precursordecomposition and monomerformation pathway. Based on the proposedreaction mechanism, a new synthetic method was designed that uses wateras a novel reagent to control the diameter and the aspect ratio of CdSeand CdS nanorods.

Authors:
 [1]
  1. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Advanced Scientific Computing Research. Office of Basic Energy Sciences
OSTI Identifier:
918668
Report Number(s):
LBNL-62725
R&D Project: 508401; BnR: KC0203010; TRN: US0805877
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ASPECT RATIO; CADMIUM; CHALCOGENIDES; CHEMISTRY; FREE ENERGY; FUNCTIONALS; MOLECULAR STRUCTURE; MONOMERS; PRECURSOR; QUANTUM DOTS; REACTION KINETICS; SYNTHESIS; WATER; CdSe Quantum Dot Nanocrystal Reaction Mechanism

Citation Formats

Liu, Haitao. Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis. United States: N. p., 2007. Web. doi:10.2172/918668.
Liu, Haitao. Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis. United States. doi:10.2172/918668.
Liu, Haitao. Thu . "Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis". United States. doi:10.2172/918668. https://www.osti.gov/servlets/purl/918668.
@article{osti_918668,
title = {Chemistry of the Colloidal Group II-VI Nanocrystal Synthesis},
author = {Liu, Haitao},
abstractNote = {In the last two decades, the field of nanoscience andnanotechnology has witnessed tremendous advancement in the synthesis andapplication of group II-VI colloidal nanocrystals. The synthesis based onhigh temperature decomposition of organometallic precursors has becomeone of the most successful methods of making group II-VI colloidalnanocrystals. This methodis first demonstrated by Bawendi and coworkersin 1993 to prepare cadmium chalcogenide colloidal quantum dots and laterextended by others to prepare other group II-VI quantum dots as well asanisotropic shaped colloidal nanocrystals, such as nanorod and tetrapod.This dissertation focuses on the chemistry of this type of nanocrystalsynthesis. The synthesis of group II-VI nanocrystals was studied bycharacterizing the molecular structures of the precursors and productsand following their time evolution in the synthesis. Based on theseresults, a mechanism was proposed to account for the 2 reaction betweenthe precursors that presumably produces monomer for the growth ofnanocrystals. Theoretical study based on density functional theorycalculations revealed the detailed free energy landscape of the precursordecomposition and monomerformation pathway. Based on the proposedreaction mechanism, a new synthetic method was designed that uses wateras a novel reagent to control the diameter and the aspect ratio of CdSeand CdS nanorods.},
doi = {10.2172/918668},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu May 17 00:00:00 EDT 2007},
month = {Thu May 17 00:00:00 EDT 2007}
}

Thesis/Dissertation:
Other availability
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