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.
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.
Xu
Weiqing
W
Key Laboratory for Supramolecular Structure and Material Ministry of Education of China, Jilin Universitym, Changchun, PR China. wqxu@mail.jlu.edu.cn
Xu
Shuping
S
Lü
Zhicheng
Z
Chen
Lei
L
Zhao
Bing
B
Ozaki
Yukihiro
Y
D008027:Light; D008832:Microchemistry / Q000379:methods*; D011725:Pyridines / Q000032:analysis*; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
C495406:1,4-bis(4-vinylpyridyl)phenylene; D011725:Pyridines