Surface-enhanced Raman scattering based on colloidal Ag nanoparticles for quantitative detection of cetyltrimethyl ammonium bromide
In this paper, colloidal Ag nanoparticles with uniform particle size were prepared by sodium citrate as reducing agent, and used as a surface-enhanced Raman scattering (SERS) active substrate to detect quantitatively trace cetyltrimethyl ammonium bromide (CTAB). It was found that the intensity of SERS band of CTAB increase as the proper concentration of CTAB was gradually added to the colloidal Ag nanoparticles. The self-assembly CTAB fabricated on the colloidal Ag nanoparticles induced by electrostatic interactions of the cationic surfactant CTAB and citrate-reduced silver nanoparticles, which caused the formation of a SERS active substrate with the larger enhancement. The intensity of the CTAB signal and its concentration in the range of 1.0–7.5 μM shows a linear response with a low detection limit of 0.79 μM. This proposed SERS-based method of trace CTAB determination shows excellent sensitivity, selectivity and reproducibility without adding the probe molecules. It may have potential applications in many areas.
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Document Type: Research Article
Publication date: February 1, 2016
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