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Resonance Raman process and photo-induced phase transition via 632.8 nm irradiation for diacetylene monocarboxylic acid derivative self-assembled layers on Ag surfaces

Paper ID Volume ID Publish Year Pages File Format Full-Text
29180 44127 2008 6 PDF Available
Title
Resonance Raman process and photo-induced phase transition via 632.8 nm irradiation for diacetylene monocarboxylic acid derivative self-assembled layers on Ag surfaces
Abstract

Photo-induced interfacial behaviors of a diacetylene monocarboxylic acid derivative 10,12-pentacosadiynoic acid (PCDA) on Ag substrates have been examined by means of surface enhanced Raman scattering (SERS) as a function of irradiation time upon excitation at 632.8 nm close to the blue phase's maximum absorption at ∼625 nm. Photoreactions on a SERS-active spot appeared to differ from those on a SERS-inactive substrate. On a SERS-inactive Ag plate, laser excitation at 632.8 nm led to the exhibition of longer conjugation length blue phase PCDA than red phase via a resonance Raman process. On a roughened SERS active Ag plate, as the irradiation time elapsed, PCDA appeared to exhibit a blue-to-red phase transition even under excitation at 632.8 nm and the subsequent photo-degradation. Raman mapping of the CC stretching band intensity change at ∼1450 cm−1 for the blue phase, with respect to that at ∼1500 cm−1 for the red phase, can be utilized as a new method of photo-induced micro-patterning on SERS active surfaces.

Keywords
10,12-Pentacosadiynoic acid (PCDA); Ag; Photoreaction; SERS; Micro-Raman mapping
First Page Preview
Resonance Raman process and photo-induced phase transition via 632.8 nm irradiation for diacetylene monocarboxylic acid derivative self-assembled layers on Ag surfaces
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 194, Issues 2–3, 20 February 2008, Pages 356–361
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering