Surface-Enhanced Raman Scattering (SERS) - iaria

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SERS definitions • SERS is a phenomenon associated with the enhancement of the electromagnetic field surrounding small objects optically excited near an intense and sharp plasmon resonance. The enhanced fields excite the adsorbate (probe) and the scattered radiation will again be enhanced. • Surface-enhanced Raman scattering (SERS) consists in using the large local field enhancements that can exist at metallic surfaces (under the right conditions, typically by profiting from localized surface plasmon resonances) to boost the Raman scattering signal of molecules at (or close to) the surface. E.C. Le Ru and P. G. Etchegoin, Principles of Surface-Enhanced Raman Spectroscopy and related plasmonic eects, Elsevier , 2009 August 19, 2012 ICQNM 2012 Rome, Italy 18
First experience • SERS conditions: – specic metals (e.g. Au, Ag, Cu, Pt, ...) – surfaces with roughness on the nanometer scale – proper wavelength of excitation • SERS results: – no enhancements observed for water, methanol, etc - most solvents... – certain molecules provided much higher Raman intensities (mostly molecules with carbon doublebonds) August 19, 2012 ICQNM 2012 Rome, Italy 19
Page 1 and 2: Surface-Enhanced Raman Scattering (
Page 3 and 4: Pros and cons of Raman (SERS) • A
Page 5 and 6: Energy levels =2 Excited electron s
Page 7 and 8: Dipole moment in a molecule 0 - mo
Page 9 and 10: IR vs Raman Polystyrene Senses dipo
Page 11 and 12: Stokes vs anti-Stokes Rayleigh line
Page 13 and 14: Cross-sections of the optical proce
Page 15 and 16: Steps of Raman development • Lase
Page 17: SERS experiment with pyridine adsor
Page 21 and 22: Deilectric function of metals E.C.
Page 23 and 24: Optical properties of metals Re() i
Page 25 and 26: Plasmonic welding Before illuminati
Page 27 and 28: Electric field outside of metal sph
Page 29 and 30: Distance dependence Pyridine, Ag ov
Page 31 and 32: Wavelength dependence benzenethiol,
Page 33 and 34: SERRS • The energy of the incomin
Page 35 and 36: Chemical enhancement EF EM , EF CE
Page 37 and 38: SERS enhancement factor Analytical
Page 39 and 40: Inetrmediate conclusion II • High
Page 41 and 42: Metal colloids for SERS • Mainly
Page 43 and 44: SPR of colloids Observed effects ar
Page 45 and 46: Gold Lace Nanoshells PU means amphi
Page 47 and 48: Nanoshells 4-mercaptobenzoic acid (
Page 49 and 50: ’Planar’ substrates - metal isl
Page 51 and 52: ’Planar’ substrates - nanoengin
Page 53 and 54: Nanohole array 100 nm thick Au 200
Page 55 and 56: Pillar based substrate SiO2 d=150nm
Page 57 and 58: Commersial SERS substrate (Klarite)
Page 59 and 60: Single-molecule detection • Compe
Page 61 and 62: SERS fluctuation sources • Photo-
Page 63 and 64: Raman instrumetation Excitation and
Page 65 and 66: Portable Raman Stage Optical fiber
Page 67 and 68: Single walled carbon nanotube on Si
Page 69 and 70:
Fabrication method of metal nanostr
Page 71 and 72:
Large and small particles on the sa
Page 73 and 74:
EF measurement thioglycerol Used fo
Page 75 and 76:
Biological applications of SERS •
Page 77 and 78:
Summary • Metal nanostructures pr
Page 79 and 80:
Questions • Is it possible to do
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