Title page for ETD etd-04262005-181042


Type of Document Dissertation
Author Dickerson, Bryan Douglas
Author's Email Address bryannet@vt.edu
URN etd-04262005-181042
Title Organometallic Synthesis Kinetics of CdSe Quantum Dots
Degree PhD
Department Materials Science and Engineering
Advisory Committee
Advisor Name Title
Claus, Richard O. Committee Chair
Davis, Richey M. Committee Member
Love, Brian J. Committee Member
Meissner, Kenith E. Committee Member
Robertson, John L. Committee Member
Spillman, William B. Jr. Committee Member
Keywords
  • diffusion
  • growth mechanisms
  • HgCdTe
  • HgTe
  • quantum dot
  • nanocrystal
  • nanoparticle
  • CdSe
  • II VI semiconductor
  • photoluminescence
  • cadmium selenide
  • kinetics
  • organometallic synthesis
Date of Defense 2005-04-12
Availability unrestricted
Abstract

CdSe quantum dots produced by organometallic synthesis are useful as tunable emitters for photonic devices and as multi-colored protein markers for biomedical imaging, applications requiring bright and narrow emission. A diffusion-limited model helped monitor growth rates via photoluminescence and absorbance spectroscopy, in order to characterize synthesis kinetics in stearic acid, dodecylamine, and in trioctylphosphine oxide. The nucleation rate increased with Se concentration, while the growth rate followed the Cd concentration.

Emission peak widths, emission redshift rates, nanocrystal growth rates, and reactant concentrations all decreased to a minimum when emission reached the critical wavelength, at a reaction completion time, tc. The temperature dependence of 1/tc and of redshift rates followed Arrhenius behavior governed by activation energies, which were tailored by the choice of solvent. Synthesis in solvents, such as stearic acid, with lower activation energies produced faster initial nanocrystal growth and longer critical wavelengths. The highest photoluminescence quantum yield was generally at wavelengths shorter than the critical wavelength, when moderate growth rates enabled surface reconstruction while precursors were still available.

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  Ch0aTitle.pdf 24.94 Kb 00:00:06 00:00:03 00:00:03 00:00:01 < 00:00:01
  Ch0bTOC.pdf 74.90 Kb 00:00:20 00:00:10 00:00:09 00:00:04 < 00:00:01
  Ch10Vita.pdf 31.33 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01
  Ch1Applications.pdf 67.18 Kb 00:00:18 00:00:09 00:00:08 00:00:04 < 00:00:01
  Ch2Theory.pdf 66.98 Kb 00:00:18 00:00:09 00:00:08 00:00:04 < 00:00:01
  Ch3History.pdf 229.37 Kb 00:01:03 00:00:32 00:00:28 00:00:14 00:00:01
  Ch4Hypothesis.pdf 248.27 Kb 00:01:08 00:00:35 00:00:31 00:00:15 00:00:01
  Ch5Experimental.pdf 493.87 Kb 00:02:17 00:01:10 00:01:01 00:00:30 00:00:02
  Ch6Results.pdf 446.37 Kb 00:02:03 00:01:03 00:00:55 00:00:27 00:00:02
  Ch7Discussion.pdf 130.88 Kb 00:00:36 00:00:18 00:00:16 00:00:08 < 00:00:01
  Ch8Refs.pdf 110.73 Kb 00:00:30 00:00:15 00:00:13 00:00:06 < 00:00:01
  Ch9Appendix.pdf 422.87 Kb 00:01:57 00:01:00 00:00:52 00:00:26 00:00:02

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