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 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 surfacecoverage of biotin on silver surface. The SERS spectra of biotin suggest that the contribution of the charge transfer mechanism to SERS may be dominant.
Fangfang Liu Huaimin Gu Xiaojuan Yuan Yue Lin Xiao Dong
MOE Key laboratory of Laser Life Science & Institute of Laser Life Science,College of Biophotonics, School of Education Science, South China Normal University, Guangzhou, China
国际会议
武汉
英文
1-8
2010-11-02（万方平台首次上网日期，不代表论文的发表时间）