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Ultrasensitive Detection of 1, 4-Bis(4-vinylpyridyl)phenylene in a Small Volume of Low Refractive Index Liquid by Surface-Enhanced Raman Scattering-Active Light Waveguide

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Abstract:

This paper reports a novel surface-enhanced Raman scattering (SERS)-active light waveguide method for ultrasensitive detection of a sample dissolved in a small volume of low refractive index liquid. The SERS-active light waveguide demonstrated in this study was constructed via the light-guiding silica capillary. The surface of its inner wall was modified with SERS-active silver nanoparticles that can remarkably enhance Raman signals. The capillary with the SERS-active modified layer was filled with the sample solution to form the SERS-active liquid core (LC) fiber. The incident laser beam travels through the waveguide in a totally reflective mode within the fiber wall and penetrates a small distance into the sample solution by the evanescent wave field. The Raman scattering of the analytes adsorbed onto the surface of the SERS-active modified layer can be excited by laser beam and refracted into the fiber wall. Thus, a sample dissolved in low refractive index liquid, e.g., methanol, can be quantitatively monitored by Raman spectroscopy and the detection limit of its concentration is lower than 10-9mol/L.

Keywords: LIGHT WAVEGUIDE; LIQUID CORE FIBERS; LOW REFRACTIVE INDEX; SERS; SURFACE-ENHANCED RAMAN SCATTERING; ULTRASENSITIVE DETECTION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370204773580257

Affiliations: Key Laboratory for Supramolecular Structure and Material of Ministry of Education of China, Jilin University, Changchun, 130012, P. R. China

Publication date: April 1, 2004

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