Oligonucleotide guanosine conjugated to gallium nitride nano-structures for photonics. Metadata

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Title

  • Main Title Oligonucleotide guanosine conjugated to gallium nitride nano-structures for photonics.

Creator

  • Author: Li, Jianyou
    Creator Type: Personal

Contributor

  • Chair: Neogi, Arup
    Contributor Type: Personal
    Contributor Info: Major Professor
  • Committee Member: Littler, Chris
    Contributor Type: Personal
  • Committee Member: Hu, Zhibing
    Contributor Type: Personal
  • Committee Member: Krokhin, Arkadii
    Contributor Type: Personal

Publisher

  • Name: University of North Texas
    Place of Publication: Denton, Texas

Date

  • Creation: 2008-08
  • Digitized: 2009-04-11

Language

  • English

Description

  • Content Description: In this work, I studied the hybrid system based on self-assembled guanosine crystal (SAGC) conjugated to wide-bandgap semiconductor gallium nitride (GaN). Guanosine is one of the four bases of DNA and has the lowest oxidation energy, which favors carrier transport. It also has large dipole moment. Guanosine molecules self-assemble to ribbon-like structure in confined space. GaN surface can have positive or negative polarity depending on whether the surface is Ga- or N-terminated. I studied SAGC in confined space between two electrodes. The current-voltage characteristics can be explained very well with the theory of metal-semiconductor-metal (MSM) structure. I-V curves also show strong rectification effect, which can be explained by the intrinsic polarization along the axis of ribbon-like structure of SAGC. GaN substrate property influences the properties of SAGC. So SAGC has semiconductor properties within the confined space up to 458nm. When the gap distance gets up to 484nm, the structure with guanosine shows resistance characteristics. The photocurrent measurements show that the bandgap of SAGC is about 3.3-3.4eV and affected by substrate properties. The MSM structure based on SAGC can be used as photodetector in UV region. Then I show that the periodic structure based on GaN and SAGC can have photonic bandgaps. The bandgap size and the band edges can be tuned by tuning lattice parameters. Light propagation and emission can be tuned by photonic crystals. So the hybrid photonic crystal can be potentially used to detect guanosine molecules. If guanosine molecules are used as functional linker to other biomolecules which usually absorb or emit light in blue to UV region, the hybrid photonic crystal can also be used to tune the coupling of light source to guanosine molecules, then to other biomolecules.

Subject

  • Keyword: photonic crystal
  • Keyword: Wide-band gap
  • Keyword: photodetector
  • Library of Congress Subject Headings: Oligonucleotides.
  • Library of Congress Subject Headings: Gallium nitride.
  • Library of Congress Subject Headings: Nanostructures.
  • Library of Congress Subject Headings: Photonics.

Collection

  • Name: UNT Theses and Dissertations
    Code: UNTETD

Institution

  • Name: UNT Libraries
    Code: UNT

Rights

  • Rights Access: public
  • Rights License: copyright
  • Rights Holder: Li, Jianyou
  • Rights Statement: Copyright is held by the author, unless otherwise noted. All rights reserved.

Resource Type

  • Thesis or Dissertation

Format

  • Text

Identifier

  • OCLC: 378731615
  • Archival Resource Key: ark:/67531/metadc9065

Degree

  • Degree Name: Doctor of Musical Arts
  • Degree Level: Doctoral
  • Degree Discipline: Physics
  • Academic Department: Department of Physics
  • Degree Grantor: University of North Texas

Note

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