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5 Conclusion The present studies show that array structures can be used to produce local field enhancements that are considerably larger than is found for isolated particles or dimers. These enhancements are large enough, in fact, that singlemolecule SERS measurements may be possible. The largest enhancements were obtained using a structure of two one-dimensional arrays, one parallel to the wavevector...
4 Summary Using generalized Mie theory, it is possible to estimate field-enhancement effects in strongly interacting nanoparticle systems, including dense aggregates of several nanoparticles. Apart from the inherent approximation of a spherical particle shape, the method is a complete solution to Maxwell’s equations. Based on GMT, we have shown that Ag nanoparticle aggregates exhibit polarization-dependent...
4 Conclusion In this Chapter, we employed the 3D-FDTD method to calculate and evaluate the local electromagnetic field by investigating the effect of the surface geometry, the size, shape, and aggregation forms of nanoparticles on the SERS activity of transition metal systems. Our calculation on the cauliflowerstructured nanoparticles shows that the em enhancement is sensitive not only to the polarization...
3 Conclusion In this Chapter, we have described several applications of the enhancement of resonance Raman scattering and molecular fluorescence toward the characterization of single molecules, monolayers, and thin solid films on metal-island films, colloidal metal nanoparticles, and nanocomposite films. While this review is by no means extensive, we believe it does serve to shed light on some of...
3 Conclusion/Outlook Tip-enhanced Raman spectroscopy is a vibrational spectroscopy with hitherto unprecedented sensitivity and spatial resolution. Since the enhancement is mainly provided by the near-field excited at the apex of a suitable tip, TERS appears to be a widely applicable spectroscopy and microscopy tool, in contrast to its parents, surface-enhanced Raman spectroscopy (SERS) and scanning...
4 Summary We have investigated SM-SERRS spectra and intensity trajectories of individual EGFP molecules adsorbed on silver colloids. Spectral jumps, in a timescale of seconds, were observed in the SM-SERRS spectral trajectories. These jumps were attributed to a slow, reversible conversion between the protonated and deprotonated form of the chromophore in EGFP based on comparison with an ensemble Raman...
4 Concluding Remarks Surface-enhanced vibrational spectroelectrochemistry constitutes a powerful approach for elucidating the reaction mechanisms and dynamics of immobilized redox proteins. In contrast to traditional electrochemical methods, the combination of SERR and SEIRA provides a direct and detailed molecular picture of all potential-dependent processes of the adsorbed species, including those...
6 Conclusions Since the discovery of SERS nearly thirty years ago, it has progressed from model-system studies of pyridine to state-of-the-art surface-science studies coupled with real-world applications. We have demonstrated a SERS-based glucose sensor as an example of the latter. A SERS-active surface functionalized with a mixed SAM was shown to partition and departition glucose efficiently. The...
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