Citation: CAO Xiao-Wei, LIU Wen-Hua, LI Xin-Ran, WANG Rong, WU Xia-Qin. SERS Spectroscopic Characterization and Analysis of the Molecular Structure of Linkage Monolayers in Assembled ld Nanoparticle Films[J]. Acta Physico-Chimica Sinica, ;2011, 27(07): 1600-1608. doi: 10.3866/PKU.WHXB20110723 shu

SERS Spectroscopic Characterization and Analysis of the Molecular Structure of Linkage Monolayers in Assembled ld Nanoparticle Films

1.
Department of Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China

Received Date: 24 November 2010
Available Online: 27 May 2011
Fund Project: 国家自然科学基金(20775049, 20973114)资助项目 (20775049, 20973114)

Molecular assembly was used to prepare a 4,4′-dithiodipyridine (PySSPy) self-assembled monolayers (SAMs) modified ld electrode. The prepared PySSPy SAMs modified on ld electrode were then used as linkage monolayers to fabricate ld nanoparticle assembled films. In our research, surface- enhanced Raman scattering (SERS) technique was used to investigate the structural characteristics of the linkage monolayers. Moreover, electrochemical in situ SERS spectroscopy was used to characterize the effect of electrode potential on the molecular structure of this linkage monolayer. An analysis of the regular variations in intensities and shifts of the characteristic Raman peak pairs related to the adsorbed molecules in this linkage monolayer, such as at 1011 and 1093 cm^-1, 1575 and 1610 cm^-1, 1206 and 1215 cm^-1, revealed that the aromaticity of the pyridyl ring groups in the linkage monolayer changed with the applied electrode potential. The results show that the adsorbed molecule exists mainly in the form of a thiol tautomer in the negative potential range while it exists mainly in the form of a thione tautomer in the positive potential range.
- ld nanoparticle,
- Nanoparticle film,
- 4,4′-Dithiodipyridine,
- Self-assembled monolayer,
- Surface-enhanced Raman scattering,
- Electrode potential
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