Frontiers of surface-enhanced raman scattering : by Yukihiro Ozaki, Katrin Kneipp, Ricardo Aroca
By Yukihiro Ozaki, Katrin Kneipp, Ricardo Aroca
A complete presentation of Surface-Enhanced Raman Scattering (SERS) idea, substrate fabrication, purposes of SERS to biosystems, chemical research, sensing and primary innovation via experimentation. Written by means of across the world famous editors and members.
Relevant to all these in the medical group facing Raman Spectroscopy, i.e. physicists, chemists, biologists, fabric scientists, physicians and biomedical scientists.
SERS functions are generally increasing and the expertise is now utilized in the sector of nanotechnologies, functions to biosystems, nonosensors, nanoimaging and nanoscience.
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Extra info for Frontiers of surface-enhanced raman scattering : single-nanoparticles and single cells
Despite very different signal levels of “normal” Raman scattering and HRS, SERS and SEHRS spectra appear at comparable signal levels and can be measured in the same spectrum by using the first and second diffraction order of the spectral grating . Here we investigate silver nanoaggregates by one-and two-photon excited SERS. Excitation at various wavelengths in the NIR range provided by a tunable picoseconds Ti:Sapphire laser allows one to probe local optical fields in the hot spots in dependence on the photon energy.
Despite the extinction spectrum of the hot nanoaggregates showing a maximum around 400 nm and almost no signal at longer wavelengths, the highest SERS enhancement has been obtained at NIR excitation. However, EEL spectra identify plasmon resonances in the NIR range where SERS at extremely high enhancement has been measured. Experimental studies using tunable excitation in the NIR range show an increase in local field enhancement with decreasing photon energy. Experiments performed on silver or gold nanoaggregates in solution, with analyte concentrations 1–4 orders of magnitude below the concentration of the enhancing nanoaggregates, avoid heterogeneity in SERS enhancement.
D. et al. (2012) Characterizing the kinetics of nanoparticle-catalyzed reactions by surface-enhanced Raman scattering. Angewandte Chemie International Edition, 51, 7592–7596. 58. H. D. (2008) Measurement of the distribution of site enhancements in surface-enhanced Raman scattering. Science, 321, 388–392. 59. Y. et al. (2009) Revealing the spatial distribution of the site enhancement for the surface enhanced Raman scattering on the regular nanoparticle arrays. Optics Express, 17, 13974–13981. 1 Introduction Surface-enhanced Raman scattering [1, 2] (SERS), a spectroscopy technique with a sensitivity level down to one molecule [3–5], has recently opened up exciting opportunities for studying single-molecule behavior at the interface with noble metals.