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Title page for ETD etd-12062012-220642

Type of Document Dissertation
Author Harrison, Melissa Ambre
URN etd-12062012-220642
Title Heterogeneously Alloyed Semiconductor Nanocrystals with Induced Chemical Composition Gradients
Degree PhD
Department Interdisciplinary Materials Science
Advisory Committee
Advisor Name Title
Professor Sandra J. Rosenthal Committee Chair
Professor Sharon M. Weiss Committee Co-Chair
Professor Bridget Rogers Committee Member
Professor Timothy P. Hanusa Committee Member
  • crystal engineering
  • quantum dots
  • nanotechnology
  • alloy
Date of Defense 2012-09-17
Availability unrestricted
Semiconductor nanocrystals of CdSSe exhibiting chemical composition gradients are synthesized via a facile, one-pot synthesis. Varying degrees of gradation are observed as growth temperatures are manipulated to alter rates of reactivity for anionic precursors. Stoichiometries, with growth time and change in temperature, are determined using Rutherford backscattering spectroscopy (RBS) to demonstrate chemical composition gradients. Sizes and structures of compositionally graded CdSSe nanocrystals are

determined using transmission electron microscopy and X-ray diffraction techniques, respectively. We employ absorption spectroscopy and photoluminescence techniques to elucidate corresponding optical properties. Nanocrystals with chemical composition gradients demonstrating enhanced luminescence efficiency could be the key to improved nanocrystal optical performance.

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