Title page for ETD etd-12252013-091053


Type of Document Master's Thesis
Author abtahi, seyyed mohammad hossein
Author's Email Address seyyed63@vt.edu
URN etd-12252013-091053
Title Synthesis and characterization of metallic nanoparticles with photoactivated surface chemistries
Degree Master of Science
Department Chemical Engineering
Advisory Committee
Advisor Name Title
Richey M. Davis Committee Chair
Stephen Martin Committee Member
William Ducker Committee Member
Keywords
  • surface plasmon resonance
  • PEG (poly ethylene glycol)
  • UV photo activation
  • photocleavable oligomer
  • silver nanospheres centrifugal separation
  • Metallic nanoparticles
  • gold nanorods
  • gold nanospheres
  • UV-Vis absorbance
  • TEM (transmission electron microscopy)
Date of Defense 2013-12-19
Availability unrestricted
Abstract
During recent decades metallic nanoparticles have been found very interesting due to their unique characteristics which make them suitable for different applications. In this research, for the very first time, we tried to perform selective surface photo activation chemistry on the targeted facets of nanoparticles while they are in suspension. This technique enabled us to form desired assemblies of nanoparticles. We focused on elongated shaped gold nanorod due to its unique surface plasmon resonance and probable biomedical applications. In this research we formed a dumbbell shape assembly of nanoparticles in suspension. A probable application for these assemblies can be in vivo imaging. Initially, we reproduced gold nanorods using existing techniques in prior papers and optimized them according to our research needs. A low rpm centrifugal separation technique was developed to efficiently separate synthesized gold nanorods from other shapes. Several characterization techniques were utilized to characterize nanoparticles at each step including UV-absorbance, zeta potential, and dynamic light scattering. Different generations of oligomers were synthesized to be used as gold nanorods coating, and each coating was tested and characterized using appropriate techniques. Our two-step coating replacement method using one of these photocleavable oligomers enabled us to achieve, for the very first time, selective UV photo activation of gold nanorod tips. The photo activated tips were then exposed to oppositely charged gold nanospheres to form dumbbell shape assemblies of gold nanorods and nanospheres. Furthermore, dumbbell shape assembly of nanoparticles was investigated and characterized.
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