Surface enhanced raman spectroscopy on dielectrophoresis induced diffusion limited aggregation of gold nanoparticles

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Title Surface enhanced raman spectroscopy on dielectrophoresis induced diffusion limited aggregation of gold nanoparticles
Publication Type thesis
School or College College of Engineering
Department Electrical & Computer Engineering
Author Chowdhury, Faisal Khair
Date 2011-05
Description Wires formed by diffusion limited aggregation (DLA) induced by dielectrophoresis (DEP) of gold nanoparticles were investigated as an effective sample preparation method for surface enhanced Raman spectroscopy (SERS). Thymine was used as a test molecule and its SERS was measured to investigate the effectiveness of this technique that reproducibly resulted in x109 enhancement. It is known that molecules adsorbed near or at the surface of certain nanostructures produce strongly increased Raman signals and such phenomena is attributed to the concentration of electromagnetic (EM) optical fields at "hotspots" that usually occur at nanoscale junctions or clefts in metal nanostructures. Similarly, the enhancement obtained is attributed to the localized surface Plasmon?s of the gold nanoparticles and the formation of "hotspots" in DEP wires. There are other methods that reproducibly yield in excess of x108 enhancement in SERS using tunable lasers and very elaborate Raman spectroscopy. The results presented here are obtained using a fixed laser excitation source at 785 nm and a simple spectrometer (5 cm-1 resolution).
Type Text
Publisher University of Utah
Subject Dielectrophoresis; Surface enhanced raman spectroscopy; Diffusion limited aggregation; Nanoassembly; SERS; Single molecule detection; Gold nanoparticles
Dissertation Institution University of Utah
Dissertation Name Master of Science
Language eng
Rights Management Copyright © Faisal Khair Chowdhury 2011
Format application/pdf
Format Medium application/pdf
Format Extent 1,393,933 bytes
Identifier us-etd3,30015
Source Original housed in Marriott Library Special Collections, QC3.5 2011 .C46
ARK ark:/87278/s6000gwz
Setname ir_etd
ID 194629
Reference URL https://collections.lib.utah.edu/ark:/87278/s6000gwz
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