期刊
SPECTROSCOPY LETTERS
卷 46, 期 8, 页码 577-582出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00387010.2013.771189
关键词
L-cysteine; malachite green; silver colloids; surface-enhanced Raman scattering
类别
资金
- National Natural Science Foundation of China [21171072]
- Natural Science Foundation of Guangdong Province [9151063201000018]
Colloidal silver nanoparticles were prepared by a simple chemical reduction method. The effect of L-cysteine on the surface-enhanced Raman scattering activity of colloidal silver nanoparticles was investigated by using malachite green as a probe molecule. It was found that the surface-enhanced Raman scattering activity of colloidal silver nanoparticles was improved tremendously with the help of L-cysteine. The possible reasons for this enhancement effect were given. Specifically, in silver colloidal solution, no surface-enhanced Raman scattering spectrum of malachite green was observed at a relatively low concentration (2.5x10(-5)mol/L). However, well-resolved and high-quality surface-enhanced Raman scattering spectra of malachite green were successfully obtained after the addition of L-cysteine to silver colloids, and the minimum detection limit for malachite green was down to 10(-8)mol/L.
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