Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (5): 1009.

• Articles • Previous Articles     Next Articles

2D-mapping Studies of the SERS Effect on the Single Ellipsoid Fe2O3@Au Particle

SHEN Hong-Xia1,2, WANG Mei1, XU Min-Min1, YAO Jian-Lin1*, ZOU Wen-Jun1, GU Ren-Ao1*   

  1. 1. College of Chemistry, Chemical Engineering and Materials Science, Suzhou University, Suzhou 215123, China;
    2. Department of Biology and Chemical Engineering, Jiaxing University, Jiaxing 314001, China
  • Received:2009-07-22 Online:2010-05-10 Published:2010-05-10
  • Contact: YAO Jian-Lin. E-mail: jlyao@suda.edu.cn; GU Ren-Ao. E-mail: ragu@suda.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20773091, 20973120)和江苏省自然科学基金(批准号: BK2005032)资助.

Abstract:

The single spindle Fe2O3@Au core/shell particle was employed as surface-enhanced Raman scattering(SERS) substrate and thiophenol(TP) was used as probe molecule to investigate the 2D-mapping and the distribution of SERS effect on the particle surface. The difference in the SERS effect from the tips and the middle part was compared. To obtaining the SERS effect from the different sites of the single particle, we firstly simulated with mathematic model and resolved the SERS 2D-mapping, the SERS effect from the edge of the particle was extracted. The results revealed that the difference in the intensity of SERS signal could reach 2—3 folders while the single core-shell particle was oriented at a certain angle relative to the polarization of excitation laser. Assumed the particle located in xy plane and the incident wave perpendicularly spread through z axis, the intensity of SERS signal exhibited the maximum value near the tip parts of the particle, while the other parts of the particle surface were very weak and the parts near the short axis were in minimum. By considering SERS mainly contributed by lightning rod effect of electromagnetism field enhancement, the local electric field enhancement of the spindle particles near the tip along long axis relative to short axis is about 5 times.

Key words: Single spindle particle; Fe2O3@Au core/shell particle; Surface enhanced Raman scattering; 2D-mapping

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