principles of surface enhanced raman spectroscopy and related plasmonic effects pdf

Principles of surface enhanced raman spectroscopy and related plasmonic effects pdf

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Fundamental understanding and applications of plasmon-enhanced Raman spectroscopy

Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

Principles of Surface-Enhanced Raman Spectroscopy

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Fundamental understanding and applications of plasmon-enhanced Raman spectroscopy

Plasmonic nanostructures are widely utilized in surface-enhanced Raman spectroscopy SERS from ultraviolet to near-infrared applications. Periodic nanoplasmonic systems such as plasmonic gratings are of great interest as SERS-active substrates due to their strong polarization dependence and ease of fabrication. In this work, we modelled a silver grating that manifests a subradiant plasmonic resonance as a dip in its reflectivity with significant near-field enhancement only for transverse-magnetic TM polarization of light. We investigated the role of its fill factor, commonly defined as a ratio between the width of the grating groove and the grating period, on the SERS enhancement. Our numerical studies suggested that by tuning the spectral position of the optical resonance of the grating, via modifying their fill factor, we could optimize the achievable SERS enhancement.

Molecular detection techniques are conventionally based on optical, electrochemical, electronic, or gravimetric methodologies. Unfortunately, the applicability of SERS is rather limited, which is mainly due to the lack of highly sensitive SERS platforms with good stability and reproducibility. In line with this, metal nanoparticles e. Although the utilization of metallic nanoparticles in SERS is simple and cost-effective, the poor controllability of the structures and limited formation of hot spots in the detection zone leads to discrepancy in the resulting SERS signals. For these reasons, in the past few years, researchers have focused on fabricating 3-dimensional 3D SERS platforms, which increase the adsorption of analyte molecules and facilitate hot spot formation in all three dimensions. Therefore, the discovery of non-metal alternative approaches is of great interest not only to widen SERS applications but to further elucidate fundamental questions. Considering recent developments on the fabrication and application of SERS active platforms, this review is structured in 3 main directions; 1 implementation of the plasmonic nanoparticles having different shapes into SERS-active platforms, 2 highlighting recent developments in the fabrication and application of 3D SERS-active platforms, and 3 examination of recent novel inorganic and organic semiconductor based platforms for SERS applications.

Tip enhanced Raman scattering: plasmonic enhancements for nanoscale chemical analysis

Surface-enhanced Raman spectroscopy or surface-enhanced Raman scattering SERS is a surface-sensitive technique that enhances Raman scattering by molecules adsorbed on rough metal surfaces or by nanostructures such as plasmonic-magnetic silica nanotubes. Hendra and A. In , two groups independently noted that the concentration of scattering species could not account for the enhanced signal and each proposed a mechanism for the observed enhancement. Their theories are still accepted as explaining the SERS effect. Jeanmaire and Richard Van Duyne [7] proposed an electromagnetic effect, while Albrecht and Creighton [8] proposed a charge-transfer effect. The exact mechanism of the enhancement effect of SERS is still a matter of debate in the literature [10]. There are two primary theories and while their mechanisms differ substantially, distinguishing them experimentally has not been straightforward.

Scattering of light by molecules can be elastic, Rayleigh scattering, or inelastic, Raman scattering. Hence, Rayleigh scattered light does not contain much information on the structure of molecular states. In inelastic scattering, the frequency of monochromatic light changes upon interaction with the vibrational states, or modes, of a molecule. With the advancement in the laser sources, better and compact spectrometers, detectors, and optics Raman spectroscopy have developed as a highly sensitive technique to probe structural details of a complex molecular structure. With the discovery of surface-enhanced Raman scattering SERS in by Martin Fleischmann, the interest of the research community in Raman spectroscopy as an analytical method has been revived. This chapter aims to familiarize the readers with the basics of Raman scattering phenomenon and SERS.

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Ru and P. Etchegoin Published Materials Science. Surface-Enhanced Raman Scattering SERS was discovered in the s and has since grown enormously in breadth, depth, and understanding.


example, molecular Raman spectroscopy or the physics of plasmon resonances in metals. heard about surface-enhanced Raman spectroscopy (SERS) only superficially is, in fact, a shorthand for a family of effects associated with the.


Principles of Surface-Enhanced Raman Spectroscopy

Tip enhanced Raman scattering TERS is an emerging technique that uses a metalized scanning probe microscope tip to spatially localize electric fields that enhances Raman scattering enabling chemical imaging on nanometer dimensions. Arising from the same principles as surface enhanced Raman scattering SERS , TERS offers unique advantages associated with controling the size, shape, and location of the enhancing nanostructure. The relationship between plasmon resonances and Raman enhancements is emphasized as the key to obtaining optimal TERS results. Applications of TERS, including chemical analysis of carbon nanotubes, organic molecules, inorganic crystals, nucleic acids, proteins, cells and organisms, are used to illustrate the information that can be gained. Under ideal conditions TERS is capable of single molecule sensitivity and sub-nanometer spatial resolution.

SERS was discovered in the s and has since grown enormously in breadth, depth, and understanding. One of the major characteristics of SERS is its interdisciplinary nature: it lies at the boundary between physics, chemistry, colloid science, plasmonics, nanotechnology, and biology. By their very nature, it is impossible to find a textbook that will summarize the principles needed for SERS of these rather dissimilar and disconnected topics. Although a basic understanding of these topics is necessary for research projects in SERS with all its many aspects and applications, they are seldom touched upon as a coherent unit during most undergraduate studies in physics or chemistry. This book intends to fill this existing gap in the literature.

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