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Citation: SUN Fang, LI Xiao-Wei, ZHOU Yao-Guo, JI Yuan, ZHENG Jun-Wei. Surface-enhanced Raman Scattering Effect from the Charge Transfer in Silver Nanoparticle Array[J]. Chinese Journal of Applied Chemistry, ;2003, 20(8): 736-739. shu

Surface-enhanced Raman Scattering Effect from the Charge Transfer in Silver Nanoparticle Array

1.
a School of Chemical and Materials Engineering, Southern Yangtze University, Wuxi;
2.
b Department of Chemistry, Suzhou University, Suzhou 215006

Corresponding author: ZHENG Jun-Wei,
Received Date: 18 December 2002
Available Online: 6 May 2003
Fund Project: 国家自然科学基金(20073028) (20073028)

Silver nanoparticle array has been successfully fabricated on the silver substrate using p-aminothiophenol(PATP) as coupling reagent. Two-dimensional submonolayer structure of silver particles was observed in scanning electron microscope. Some a₁ vibrations in surface enhanced Raman spectra are found to be greatly enhanced, and b₂ vibrations is also observed. The results revealed that the electromagnetic enhancement should be predominant in such an assembly, howerver, it couldn't rule out the chemical enhancement due to the charge transfer between the smooth silver surface and p-aminothiophenol molecule. Both increasing potential on the assembly system or adsorption I^- on the assembly array could strengthen the electrostatic interaction between silver particle and silver substrate and weaken the charge transfer between silver substrate and coupling molecules. On the contrary, adsorption of methylviologen cation could lead to the charge transfer in a more great extent.
- self-assembled nanosilver array,
- surface-enhanced Raman scattering,
- charge transfer,
- aminothiophenol
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