title: 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.
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 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 the laser beam and refracted into the fiber wall. Thus, a sample dissolved in low index liquid, e.g., methanol, can be quantitatively monitored by Raman spectroscopy and detection limit of its concentration is lower than 10(-9) mol/L.
authors.affiliation: Key Laboratory for Supramolecular Structure and Material Ministry of Education of China, Jilin Universitym, Changchun, PR China. wqxu@mail.jlu.edu.cn
authors.forename: Weiqing
authors.initials: W
authors.lastname: Xu
authors.forename: Shuping
authors.initials: S
authors.lastname: Xu
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Lü
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Bing
authors.initials: B
authors.lastname: Zhao
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Ozaki
mesh_terms: D008027:Light; D008832:Microchemistry / Q000379:methods*; D011725:Pyridines / Q000032:analysis*; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
chemical_list: C495406:1,4-bis(4-vinylpyridyl)phenylene; D011725:Pyridines