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High-quality colloidal II-VI and IV-...

Sun, Jianwei.

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High-quality colloidal II-VI and IV-VI semiconductor nanowires: Diameter-controlled syntheses, quantum-confinement-effect studies, and electronic structure.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	High-quality colloidal II-VI and IV-VI semiconductor nanowires: Diameter-controlled syntheses, quantum-confinement-effect studies, and electronic structure./
Author:	Sun, Jianwei.
Description:	200 p.
Notes:	Adviser: William E. Buhro.
Contained By:	Dissertation Abstracts International69-05B.
Subject:	Chemistry, Inorganic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3316683
ISBN:	9780549649984

High-quality colloidal II-VI and IV-VI semiconductor nanowires: Diameter-controlled syntheses, quantum-confinement-effect studies, and electronic structure.
Sun, Jianwei.

High-quality colloidal II-VI and IV-VI semiconductor nanowires: Diameter-controlled syntheses, quantum-confinement-effect studies, and electronic structure. - 200 p.

Adviser: William E. Buhro.

Thesis (Ph.D.)--Washington University in St. Louis, 2008.

This project aims to grow colloidal II-VI and IV-VI semiconductor nanowires employing the solution-liquid-solid (SLS) mechanism first developed in our group. Bi nanoparticles are used to catalyze the wire growth. The morphologies, compositions, crystal structures, and optical properties of the nanowires are characterized by transmission electron microscopy, powder X-ray diffraction analysis, energy-dispersive X-ray spectroscopy, and ultraviolet-visible-near-infrared absorption spectroscopy.

ISBN: 9780549649984Subjects--Topical Terms:

517253
Chemistry, Inorganic.

High-quality colloidal II-VI and IV-VI semiconductor nanowires: Diameter-controlled syntheses, quantum-confinement-effect studies, and electronic structure.
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008 110624s2008 ||||||||||||||||| ||eng d
020 $a 9780549649984
035 $a (UMI)AAI3316683
035 $a AAI3316683
040 $a UMI $c UMI
100 1 $a Sun, Jianwei. $3 1279853
245 1 0 $a High-quality colloidal II-VI and IV-VI semiconductor nanowires: Diameter-controlled syntheses, quantum-confinement-effect studies, and electronic structure.
300 $a 200 p.
500 $a Adviser: William E. Buhro.
500 $a Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 2998.
502 $a Thesis (Ph.D.)--Washington University in St. Louis, 2008.
520 $a This project aims to grow colloidal II-VI and IV-VI semiconductor nanowires employing the solution-liquid-solid (SLS) mechanism first developed in our group. Bi nanoparticles are used to catalyze the wire growth. The morphologies, compositions, crystal structures, and optical properties of the nanowires are characterized by transmission electron microscopy, powder X-ray diffraction analysis, energy-dispersive X-ray spectroscopy, and ultraviolet-visible-near-infrared absorption spectroscopy.
520 $a CdTe quantum wires having diameters in the range of 5-11 nm are grown using cadmium n-octadecylphosphonate and tri-n-octylphosphine telluride as precursors. The size dependence of the effective band gaps in the quantum wires are compared to the experimental results for CdTe quantum dots. The effective band gaps of CdTe dots and wires of like diameter are found to be experimentally indistinguishable. The present results are explained with the assistance of density functional theory under the local-density approximation by implementing a charge-patching method (DFT-LDA-CPM). The higher-level theoretical analysis finds the general existence of a threshold diameter, above which dot and wire effective band gaps converge. The origin and magnitude of the threshold diameter is discussed.
520 $a The electronic structure of CdTe quantum wires is determined by DFT-LDA-CPM calculations. The calculated results are used to assign the absorption spectrum of the CdTe quantum wires. Quantitative agreement between experiment and theory is achieved. The absorption features consist of clusters of transitions that are determined by the conduction-band energy-level spacings. The sequence, character, and spacing of the conduction-band states are strikingly consistent with the predictions of the effective-mass-approximation, particle-in-a-cylinder model.
520 $a PbSe nanowires having diameters in the range of 6-18 nm are grown by the Bi-catalyzed SLS mechanism. The diameter control of the nanowires is achieved by varying the reaction temperatures, the precursors and their ratios, and the Bi nanoparticles. The near-infrared absorption observed from the 6.8-nm diameter PbSe nanowires confirms strong quantum confinement.
520 $a PbS and CdS nanowires are successfully grown using single-source precursors. Well-resolved near-infrared absorption features are observed from the colloidal PbS nanowires, confirming strong quantum confinement. The present results strongly suggest that the single-source SLS strategy may extend to other colloidal semiconductor nanowire systems that are not easily prepared by a dual-source precursor approach.
590 $a School code: 0252.
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0488
710 2 $a Washington University in St. Louis. $3 1017519
773 0 $t Dissertation Abstracts International $g 69-05B.
790 $a 0252
790 1 0 $a Buhro, William E., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3316683