Chloride ion-dependent surface-enhanced Raman scattering study of biotin on the silver surface

In the present paper, the surface enhanced Raman scattering (SERS) technique was employed to study the SERS spectra of biotin molecules formed on the silver surface. The adsorption geometries of biotin molecules on the silver surface were analyzed based on the SERS data. It can be found that most vi...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-01, Vol.277 (1), p.012025-8
Main Authors: Liu, Fangfang, Gu, Huaimin, Yuan, Xiaojuan, Lin, Yue, Dong, Xiao
Format: Article
Language:English
Subjects:
Adsorption
Biotin
Charge transfer
Chloride
Chloride ions
Physics
Raman scattering
Raman spectra
Silver
Sodium chloride
Spectra
Surface chemistry
Vibration mode
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Summary:In the present paper, the surface enhanced Raman scattering (SERS) technique was employed to study the SERS spectra of biotin molecules formed on the silver surface. The adsorption geometries of biotin molecules on the silver surface were analyzed based on the SERS data. It can be found that most vibration modes show a Raman shift in silver sol after the addition of sodium chloride solution. In addition, The Raman signals of biotin become weaker and weaker with the increase of the concentration of sodium chloride. This may be due to that the interaction between chloride ions and silver particles is stronger than the interaction between biotin molecules and silver particles. When the concentration of sodium chloride in silver colloid is higher than 0.05mol/L, superfluous chloride ions may form an absorption layer so that biotin can not be adsorbed on silver surface directly. The changes in intensity and profile shape in the SERS spectra suggest different adsorption behavior and surface-coverage of biotin on silver surface. The SERS spectra of biotin suggest that the contribution of the charge transfer mechanism to SERS may be dominant.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/277/1/012025