Self-assembly of polyelectrolyte-coated silver nanoparticles with metanil yellow for use in Raman amplification
Keywords
Nanoparticles; Polyelectrolytes; Raman effect; Self assembly (Chemistry)
Abstract
In optical signal transmission, signal attenuation is compensated by use ofamplifiers. Recently, Raman gain has been investigated due to the possibility of optical signal amplification. To increase the gain bandwidth in Raman amplification, an electrostatic self-assembly strategy was used to incorporate multiple strong Raman-active vibration modes to achieve broad Raman scattering bands. Meanwhile, the use of silver nanoparticles to increase the Raman scattering intensity by a surface enhanced Raman scattering (SERS) mechanism was investigated. The bifunctional copolymer poly(4-vinylpyridine-ca-acrylonitrle) was synthesized and characterized by the average viscosity molecular weight measurement, along with 1H NMR, 13C NMR, and FTIR spectroscopy. Nitrile groups were introduced to complex the silver nanoparticles. The pyridine moieties were protonated as the pyridinium salt to spontaneously form ion-pairs with anionic molecules, such as metanil yellow. Metanil yellow was chosen since it includes multiple potential Raman-active vibrational modes. Consequently, the vibration normal modes of the 4-vinyl-pyridine and metanil yellow components were analyzed and assigned. Silver nanoparticles were generated in situ and characterized by UV-vis absorption spectroscopy to estimate the particle size. A self-assembled solid-state polyelectrolyte/dye complex was studied by TGA, DSC, and FTIR spectroscopy. The mechanism of dye ii adsorption and aggregation in the presence of the polyelectrolyte was further investigated by UV-vis spectroscopy. Finally, Raman spectra were obtained for both the copolymer/dye complex and the complex-coated silver nanoparticle composites. An intense, broad band of Raman scattering between 1000 cm·1 and 2000 cm~1 (with bandwith > 800 cm-1) was observed. The intensity ofthis band was enhanced as much as twice, presumably by SERS, for the complex-coated silver nanoparticle composites.
Notes
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Graduation Date
2003
Advisor
Belfield, Kevin
Degree
Master of Science (M.S.)
College
College of Arts and Sciences
Department
Chemistry
Format
Pages
71 p.
Language
English
Length of Campus-only Access
None
Access Status
Masters Thesis (Open Access)
Identifier
DP0028724
Subjects
Arts and Sciences -- Dissertations, Academic; Dissertations, Academic -- Arts and Sciences
STARS Citation
Xiao, Dequan, "Self-assembly of polyelectrolyte-coated silver nanoparticles with metanil yellow for use in Raman amplification" (2003). Retrospective Theses and Dissertations. 1074.
https://stars.library.ucf.edu/rtd/1074
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