SERS EM enhancement-shape effect Field enhancement 15 400 Ag.Au or Cu 300 200 100 50 10 20 5 105 21 0 300 400 500 0.5 Wavelength/nm 0.2 J.Kottmann et al.,IFH Field Theory Group ETH Zurich SERS:Excitation of plasmon resonances in Ag (Au or Cu)nanoparticles Raman spectroscopy utilizes optical properties of nanostructures
SERS EM enhancement – shape effect SERS: Excitation of plasmon resonances in Ag (Au or Cu) nanoparticles Raman spectroscopy utilizes optical properties of nanostructures Wavelength [nm] SCS [nm] J. Kottmann et al., IFH Field Theory Group, ETH Zürich Ag, Au or Cu Wavelength/nm Scattering Cross section Field enhancement
SERS EM enhancement-shape effect Field enhancement 400 300 200 1 50 00521 300 400 500 0.5 Wavelength/nm 0.2 J.Kottmann et al.,IFH Field Theory Group, ETH Zurich SERS:Raman spectroscopy utilizes optical properties of nanostructures
SERS: Raman spectroscopy utilizes optical properties of nanostructures J. Kottmann et al., IFH Field Theory Group, ETH Zürich Wavelength [nm] SCS [nm] *10 SERS EM enhancement – shape effect Scattering Cross section Wavelength/nm Field enhancement
SERS EM enhancement-aggregation effect Field enhancement 20nm 300 200 60 50 10 40 Ag.Au or Cu 20 0.5 0 300 400 500 J.Kottmann et al.,IFH Field Theory Group. Wavelength/nm ETH Zurich SERS:Raman spectroscopy utilizes optical properties of nanostructures
SERS: Raman spectroscopy utilizes optical properties of nanostructures 20 nm J. Kottmann et al., IFH Field Theory Group, ETH Zürich Ag, Au or Cu SERS EM enhancement – aggregation effect Field enhancement 400 200 100 50 20 10 5 2 1 0.5 0.2 Scattering Cross section Wavelength/nm
Goniometer k Polarizer Photodiode Laser Prism Lens Signal Lens 2 010 Lens 3 Amplifier Silver Film Sample Object Lens Spectrometer Computer Lens 4 Mobile CCD Control System Mirror Mirror SPR&SERS Image Display Spectra Edge Filter CCD 册
2.2.2样品制备 (a) 5000 counts 48.5c 47.4° 采用真空蒸镀方法在半柱面镜底面蒸镀一 46.4 层40nm的银膜，将新鲜的银膜浸在4-ATP的 45.4° 乙醇溶液中，4小时后取出，用大量乙醇冲洗，然 44.4。 后用氮气吹干。 43.4° 3结果与讨论 42.4o 41.0 利用SPR-SERS显微光谱仪同时测量了吸 38.0° 附在40nm银膜上的4-ATP自组装膜的SPR 400 80012001600 2000 曲线及不同人射角下的SERS光谱，结果如图3 Raman Shift(cm) (b)所示，图中黑色实线为SPR曲线，共振角为 120004b) @1435cm1 0.8 44.52°；方框线（☐）及圆圈线（○）分别为拉曼位 @1141cm 10000 0.7 移为1435cm-1及1141cm-1处的峰强随入射角 8000 0.6 的变化曲线。由图3(b)可知在SPR共振角附 6 -0.5 Reflectance 近SERS强度得到极大的增强，这与理论部分的 4000 0.4 模拟结果基本相符合。在共振角附近的SERS -0.3 2000 强度是非共振处强度的20多倍。 88888888889 0.2 56 40 44 48 52 56 SPR表明等离子共振 Angle/degree
SPR表明等离子共振