表面增强拉曼光谱在化学中的应用.pptVIP

厦门大学固体表面物理化学国家重点实验室 The Application of Surface-enhanced Raman Spectroscopy(SERS) on Chemistry Outline The History of SERS The Mechanism of SERS The Preparation of SERS Active Substrate The Application of SERS The Prospective of SERS IR (One-Photon) hv μ: Dipole Moment Raman (Two-Photon) Ground State Virtual State hv hv α: Polarizability Infrared and Raman The first SERS measurement was reported by Fleischmann et al. on pyridine adsorbed at a highly rough silver electrode in 1974 Fleischamnn, M.; Hendra, P. J.; McQuillan, A. J. ; Chem. Phys. Lett. 1974, 26, 163 Two mechanisms to account for SERS 1. Electromagnetic Enhancement 2. Chemical Enhancement CT Mechanism EM Mechanism SERS Theory Surface Plasmon resonance Image field effect Lighting rod effect Particle coupling effect Fractal structures Metal-to-molecule Molecule-to-Metal Potential effect Coverage effect Substrate effect Incident frequency A possible mechanism combin-ing the electromagnetic effect with charge transfer effect enormous signal 8B Transition Metals Noble Metals Advantages and disadvantages The Preparation of SERS Active Substrate Oxidation–Reduction Cycle Chemical Etching Film Deposition Overlayer Technique Chemical Reduction and Laser Ablation Lithography Self-assembled Monolayers Technique Au core/ Pd Shell Coating Ultrathin Film Surface Fabricating Metal colloid hv hv (+/-) Electrochemical Cell The Application of SERS Advanced Materials and Surface Processing: Polymer Interfaces Self-assembled Monolayers Langmuir–Blodgett Films Catalysis: Adsorption and Reaction on Catalysts Probe Molecules for Catalytic Study The Application of SERS Electrochemistry and Corrosion Electrocatalysis Electrochemical Double Layer Corrosion Processes Biology and Sensor Biology and Biochemistry Chemical Sensors Hyphenated Analytical Techniques The Application of SERS Qualitative analysis Quantitative analysis Adsorption conformation Ads