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Title page for ETD etd-03242016-152047


Type of Document Dissertation
Author Beam, Jeremiah Cooper
URN etd-03242016-152047
Title Confined-Plume Chemical Deposition of Transition Metal Borides and Chalcogenides Initiated by Pulsed, Infrared, Tabletop Lasers
Degree PhD
Department Chemistry
Advisory Committee
Advisor Name Title
Charles M. Lukehart Committee Chair
Borislav L. Ivanov Committee Member
David E. Cliffel Committee Member
David W. Wright Committee Member
Timothy P. Hanusa Committee Member
Keywords
  • chemical deposition
  • materials synthesis
Date of Defense 2016-03-18
Availability unrestricted
Abstract
Developing plasma-mediated methods to achieve local control of materials deposition at moderate temperatures is a topic of current interest. We report a novel method of obtaining crystalline coatings on soft substrates, advancing fabrication of energy-related functional materials, such as photovoltaic devices. Confined-plume chemical deposition (CPCD) occurs when pulsed laser irradiation initiates decomposition of chemical precursors with formation of a reaction plume (T roughly equal to 3000 K) under spatial and temporal confinement, resulting in nucleated growth or deposition of microcrystalline thin-film coatings. Temporal confinement of laser pulses allows residual heat to dissipate throughout the substrate material, minimizing collateral thermal damage. This process has been demonstrated using both visible (Nd:YLF, 527-nm) and infrared (Ti:Sapphire, 800-nm; Er:YAG, 2.94-µm) tabletop lasers as the irradiation source. Formation of ceramic (ReB2, MnB2), semiconductor (CdS), or piezoelectric (ZnO) microcrystalline coatings on polymer and biological substrates will be presented. Characterization methods include powder x-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectral (EDS), and Raman spectroscopy (where appropriate), and evaluation of the adhesion between ReB2/polymer samples.
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