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Harrison, Melissa
Interdisciplinary Materials Science

Research Information

Ph.D. in Interdisciplinary Materials Science, December 2012 PENDING

Ph.D. Dissertation
Heterogeneously Alloyed Semiconductor Nanocrystals with Induced Chemical Composition Gradients

Ph.D. Advisors
Sandra Rosenthal and Sharon Weiss

Committee Members
Bridget Rogers, Chemical Engineering
Timothy Hanusa, Chemistry

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Abstract. 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.


Selected Publications

Template assisted synthesis of europium sulfide nanotubes. Harrison, MA; Somarajan, S; Mahajan, SV; Koktysh, DS; van Benthem, K; Dickerson, JH, MATERIALS LETTERS, 65, 420-423 , (2011)

EuS nanocrystals: a novel synthesis for the generation of monodisperse nanocrystals with size-dependent optical properties. Koktysh, DS; Somarajan, S; He, W; Harrison, MA; McGill, SA; Dickerson, JH, NANOTECHNOLOGY, 21, 415601 , (2010)

Characterization of EuS Nanotubes in Wuantum Confinement. Thron, AM; Bonifacio, CS; Erdman, N; Harrison, MA, Somarajan, S; Dickerson, JH; van Benthem, K, MICROSCOPY AND MICROANALYSIS, 15, 1178 , (2009)

 
Vanderbilt University