Kaur, Palwinder
(2007)
Aggregation of Conjugated Polyelectrolytes in Dilute Solutions and Transmission Spectroscopy Based on Metal Nanoslit Arrays.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
This thesis consists of two parts. The first part describes the work done on understanding the affect of different solution conditions and association with different macromolecules on optical properties of polyphenylethynylene (PP1) and polyphenylphenylene (PP2) based conjugated polyelectrolytes. Conjugated polymers are of great scientific interest because of their promise for applications. The photophysical studies performed on these polyelectrolytes has provided important insight in to the structural changes in different solution conditions. These studies are useful if the potential of these polyelectroytes in complex biological fluids are to be realized as biosensors since the optical properties are greatly affected by solution conditions. Second part of the thesis investigates the chemical modification of metallic nanoaperture arrays and their potential for biochemical sensing using surface plasmon resonance. Surface plasmon resonance (SPR) spectroscopy is widely used in chemical and biological sensing. The SPR technique senses the integral changes in the dielectric ambient near a metal surface that supports surface plasmon waves. There has been a growing interest in SPR sensing of biochemicals using a nanostructured metal layer because they can also operate in the transmission configuration, thereby simplifying the optical arrangement and requiring small amounts of analyte.Optical transmission through metal nano-slit arrays has been investigated. Chemical modification of these nanoslit arrays by alkanethiols has shown to red shift the main transmission peak by 11 nm. Analysis of the plasmonic fields and charge distributions shows that the strong confinement of optical fields in the narrow slit region allows sensitive transduction of surface modification into a shift of surface plasmon resonance wavelength. Further, potential of these nano-slit arrays for biosensing has been investigated. Preliminary data shows that these nano-slit arrays have the potential for biological and chemical sensing.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
| Title | Member | Email Address | Pitt Username | ORCID |
|---|
| Committee Chair | Waldeck, DavidH | | | | | Committee Member | Velankar, Sachin | | | | | Committee Member | Weber, Steve | | | | | Committee Member | Saxena, Sunil | | | |
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| Date: |
19 September 2007 |
| Date Type: |
Completion |
| Defense Date: |
19 July 2007 |
| Approval Date: |
19 September 2007 |
| Submission Date: |
24 July 2007 |
| Access Restriction: |
5 year -- Restrict access to University of Pittsburgh for a period of 5 years. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
conjugated polyelectrolytes; fluorescence; lifetime; nanoslits; transmission |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-07242007-114321/, etd-07242007-114321 |
| Date Deposited: |
10 Nov 2011 19:53 |
| Last Modified: |
15 Nov 2016 13:46 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/8563 |
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