MS Thesis Defense by Kayla DaRosa
Advisor: Dr. Wei-Shun Chang
Committee Members: Dr. Brian Blanchette, Dr. Jamie Lawton
Abstract: Anisotropic gold nanoparticles are of significant interest due to their tunable aspect ratios, which directly influence their optical properties and plasmonic behavior. Control over these parameters enables enhancement of plasmon resonance for applications in catalysis, photochemistry, and nanotechnology. However, a major challenge in nanoparticle assembly is achieving a high yield of dimers while suppressing the formation of larger, uncontrolled aggregates. This research focuses on optimizing reaction conditions to promote selective dimer formation of anisotropic gold nanoparticles through wet chemical methods with particular emphasis on pH control and reaction kinetics. By fine-tuning these parameters, the work aims to regulate interparticle coupling and minimize aggregation beyond the dimer state. Dimerized nanoparticles enable strong plasmonic coupling and localized electromagnetic field enhancement, which are critical for high sensitivity of plasmonic sensing applications. Structural and optical characterization was conducted using scanning electron microscopy, UV-Vis spectroscopy while dynamic light scattering and circular dichroism is discussed as a complementary technique for evaluating size distribution, surface charge in solution, and chirality signal. Overall, this work provides insight into the controlled formation of gold nanorod dimers and establishes strategies to enhance yield.
Zoom Meeting: Meeting ID: 852 4961 5385 Passcode: cw0NBu
SENG 305
Heather Blaser
508-999-8587
hblaser@umassd.edu
https://us05web.zoom.us/j/85249615385?pwd=WOarhV9YbHM2bKbbLVjv7hfPQYbRnF.1