Author

Stoycheva

Date of Award

4-2007

Degree Name

Master of Science

Department

Chemistry

First Advisor

Dr. Dongil Lee

Second Advisor

Dr. Subra Muralidharan

Third Advisor

Dr. Brian C. Tripp

Access Setting

Masters Thesis-Open Access

Abstract

The focus of this thesis is the scanning electrochemical microscopy (SECM) investigation of the electron transport in lipid monolayers and in films of gold nanoparticles. The quality and stability of lipid monolayers were characterized by various analytical techniques such as fluorescence microscopy and spectroscopy, contact angle, and electrochemistry using a monolayer modified electrode. In the SECM measurement, the monolayer electron transport was not detected. The microscopic monolayer quality turned out to be not suitable for studying the electron transport.

The conductivity of mono layer protected gold clusters (MPCs) with different core sizes (1-3 nm diameter) were investigated using SECM. These AuMPCs were characterized by UV-VIS, voltammetry, and transmission electron microscopy (TEM). In SECM measurements, the film conductivity has been extracted from the feedback currents. The conductivity appears to be dependent on the MPC core size, but the dependence becomes weaker with core size dispersity. The disordering effect on the film conductivity was investigated along with the core size effect.

Included in

Chemistry Commons

Share

COinS