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On‐line surface enhanced Raman spectroscopic detection in a recyclable Au@SiO 2 modified glass capillary
Author(s) -
Wang Weiwei,
Guo Qinghua,
Xu Minmin,
Yuan Yaxian,
Gu Renao,
Yao Jianlin
Publication year - 2014
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.4553
Subject(s) - raman spectroscopy , substrate (aquarium) , sodium borohydride , thiophenol , nanoparticle , adsorption , surface enhanced raman spectroscopy , malachite green , materials science , molecule , silane , analyte , biomolecule , analytical chemistry (journal) , chemical engineering , capillary action , chemistry , nanotechnology , raman scattering , chromatography , organic chemistry , composite material , optics , catalysis , oceanography , physics , engineering , geology
A facile method was developed to fabricate a high sensitive, reproducible and recyclable surface enhanced Raman spectroscopy (SERS) active glass capillary. The Au nanoparticles were synthesized through a seed‐mediated growth approach and then self‐assembled onto the inner wall of glass capillaries. The attached Au nanoparticles were homogeneously coated with thin silica shell by using the silane coupling agent to functionalize the Au surface. By using thiophenol (TP) as SERS probe molecules, the substrate exhibited robust SERS effects. The adsorbed SERS probe molecules could be rapidly and completely removed away by flowing sodium borohydride solution and thus to obtain a refresh Au@SiO 2 film‐coated substrate for the cyclic detection on different species. The on‐line detection of TP and malachite green (MG) with different concentrations was performed in the flowing system. The intensities of SERS signals were dependent on concentrations of the detected molecules. The results indicated that the SERS‐active substrate has potential applications on the on‐line qualitative and quasi‐quantitative analysis. Copyright © 2014 John Wiley & Sons, Ltd.