| Publication Type |
thesis |
| School or College |
College of Engineering |
| Department |
Electrical & Computer Engineering |
| Author |
Chowdhury, Faisal Khair |
| Title |
Surface enhanced raman spectroscopy on dielectrophoresis induced diffusion limited aggregation of gold nanoparticles |
| 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 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 |
