单个Fe2O3@Au粒子的偏振表面增强拉曼光谱

Polarization Dependence of Surface-enhanced Raman Spectroscopy on Single Fe_2O_3@Au Particle

The core-shell Fe2O3@Au particle with spindle morphology were synthesized by three steps.The mean size of the core-shell paricles was about 500 nm by 85 nm.The final single separated spindle particles were attached onto Si substrates.The thiophenol(TP) was served as probe molecule to investigate the pola-rized dependent surface-enhanced Raman scattering(SERS) from single particle.Dramatic variations in SERS intensity was observed when the single core-shell particle was oriented at different angles relative to the polarization of excitation laser.The maximum SERS intensity was detected for TP absorbed on the anisotropic particle which was in the polarization direction parallel to the long axis of the particle,while the minimum intensity was detected at the direction of the incident field that is perpendicular to the long axis of the particle.Our preliminary results provided useful way for obtaining deeper insight to the SERS mechanism.

The core-shell Fe2O3@ Au panicle with spindle morphology were synthesized by three steps. The mean size of the core-shell paricles was about 500 nm by 85 nm. The final single separated spindle particles were attached onto Si substrates. The thiophenol （TP） was served as probe molecule to investigate the pola- rized dependent surface-enhanced Raman scattering（SERS） from single particle. Dramatic variations in SERS intensity was observed when the single core-shell particle was oriented at different angles relative to the polari- zation of excitation laser. The maximum SERS intensity was detected for TP absorbed on the anisotropic parti- cle which was in the polarization direction parallel to the long axis of the panicle, while the minimum intensity was detected at the direction of the incident field that is perpendicular to the long axis of the particle. Our pre- liminary results provided useful way for obtaining deeper insight to the SERS mechanism.