A novel ultrasensitive detection in a small volume of a low refractive index liquid via Surface enhanced Raman scattering(SERS)-active liquid core waveguide is described. The liquid core waveguide demonstrated was con...A novel ultrasensitive detection in a small volume of a low refractive index liquid via Surface enhanced Raman scattering(SERS)-active liquid core waveguide is described. The liquid core waveguide demonstrated was constructed by using the light-guiding silica capillary modified with SERS-active nanoparticles on the inner surface of the fiber wall. The Raman signal of the sample can be remarkably enhanced by the immobilized Ag nanoparticles. The laser and SERS scattering from the flowing liquid in the core possess the totally reflective waveguide model within the fiber wall. Thus, the sample dissolved in the low refractive index liquid, e.g. methanol, can be quantitatively monitored by Raman spectra in the liquid core cell and the detection limit can reach 10 -8 mol/L.展开更多
A convenient and sensitive spectrometric system based on a liquid core optical fiber and a charge coupled device was constructed for the determination of chromium（VI） in river water.Diphenylcarbazide was added to Cr...A convenient and sensitive spectrometric system based on a liquid core optical fiber and a charge coupled device was constructed for the determination of chromium（VI） in river water.Diphenylcarbazide was added to Cr（VI） solution to form colored complex in the medium of perchloric acid.With a 35 cm long Teflon optical fiber,the limit of detection（LOD） was 0.4 μg·L-1,ten times lower than that of Chinese National Standard Procedure（GB7467-87）.The method was applied to determine Cr（VI） in river water without any preconcentration.The recovery was 99%～107%.展开更多
文摘A novel ultrasensitive detection in a small volume of a low refractive index liquid via Surface enhanced Raman scattering(SERS)-active liquid core waveguide is described. The liquid core waveguide demonstrated was constructed by using the light-guiding silica capillary modified with SERS-active nanoparticles on the inner surface of the fiber wall. The Raman signal of the sample can be remarkably enhanced by the immobilized Ag nanoparticles. The laser and SERS scattering from the flowing liquid in the core possess the totally reflective waveguide model within the fiber wall. Thus, the sample dissolved in the low refractive index liquid, e.g. methanol, can be quantitatively monitored by Raman spectra in the liquid core cell and the detection limit can reach 10 -8 mol/L.
文摘A convenient and sensitive spectrometric system based on a liquid core optical fiber and a charge coupled device was constructed for the determination of chromium（VI） in river water.Diphenylcarbazide was added to Cr（VI） solution to form colored complex in the medium of perchloric acid.With a 35 cm long Teflon optical fiber,the limit of detection（LOD） was 0.4 μg·L-1,ten times lower than that of Chinese National Standard Procedure（GB7467-87）.The method was applied to determine Cr（VI） in river water without any preconcentration.The recovery was 99%～107%.
