Spectroscopy surface-enhanced

Some of the transition metal macrocycles adsorbed on electrode surfaces are of special Interest because of their high catalytic activity for dloxygen reduction. The Interaction of the adsorbed macrocycles with the substrate and their orientation are of Importance In understanding the factors controlling their catalytic activity. In situ spectroscopic techniques which have been used to examine these electrocatalytlc layers Include visible reflectance spectroscopy surface enhanced and resonant Raman and Mossbauer effect spectroscopy. This paper Is focused principally on the cobalt and Iron phthalocyanlnes on silver and carbon electrode substrates. [Pg.535]

A related effect has been described for IR spectroscopy - Surface Enhanced Infrared Absorption spectroscopy (SEIRA). However, as the enhancement factors are significantly lower than for SERS and both the required metal particle size and the activation distance between the target molecule and the particle are more than one order of magnitude smaller, no practically applicable SEIRA sensors have been demonstrated up to now. [Pg.128]

In addition to the indirect experimental evidence coming from work function measurements, information about water orientation at metal surfaces is beginning to emerge from recent applications of a number of in situ vibrational spectroscopic techniques. Infrared reflection-absorption spectroscopy, surface-enhanced Raman scattering, and second harmonic generation have been used to investigate the structure of water at different metal surfaces, but the pictures emerging from all these studies are not always consistent, partially because of surface modification and chemical adsorption, which complicate the analysis. [Pg.131]

Since most biomolecules normally exhibit medium or low Raman cross sections, an enhancement of the signal intensity for the ability to characterize even low concentrations would be preferable. Besides the application of resonance Raman spectroscopy, surface-enhanced Raman spectroscopy (SERS) is a promising alternative. In doing so the vicinity of molecules to rough noble metal surfaces leads to Raman enhancement factors of 106-108 and even up to 1014 leading to a single molecule detection limit [9]. [Pg.443]

Graham, D. (2010) The next generation of advanced spectroscopy surface enhanced Raman scattering from metal nanopartides. Angewandte Chemie International Edition, 49, 9325-9327. [Pg.327]

Figure 5.3 (a) SERS spectra at 514.5 nm (1), 676 nm (2), and 1064 nm (3) of carbon nanotubes films of ca. 150 nm thickness deposited on rough Au supports, (b), (c) same as (a) with extended wavenumber ranges. (Reprinted with permission from journal of Raman Spectroscopy, Surface-enhanced Raman scattering studies on chemically transformed carbon nanotube thin films byS. Lefrant, I. BaltogandM. Baibarac, 36, 6-7, 676-698. Copyright (2005) John Wiley Sons Ltd)... [Pg.223]

This article provides some general remarks on detection requirements for FIA and related techniques and outlines the basic features of the most commonly used detection principles, including optical methods (namely, ultraviolet (UV)-visible spectrophotometry, spectrofluorimetry, chemiluminescence (CL), infrared (IR) spectroscopy, and atomic absorption/emission spectrometry) and electrochemical techniques such as potentiometry, amperometry, voltammetry, and stripping analysis methods. Very few flowing stream applications involve other detection techniques. In this respect, measurement of physical properties such as the refractive index, surface tension, and optical rotation, as well as the a-, //-, or y-emission of radionuclides, should be underlined. Piezoelectric quartz crystal detectors, thermal lens spectroscopy, photoacoustic spectroscopy, surface-enhanced Raman spectroscopy, and conductometric detection have also been coupled to flow systems, with notable advantages in terms of automation, precision, and sampling rate in comparison with the manual counterparts. [Pg.1275]

See also Infrared Spectroscopy Overview. Mass Spectrometry Overview. Nuclear Magnetic Resonance Spectroscopy Overview. Raman Spectroscopy Surface-Enhanced. X-Ray Absorption and Diffraction Overview. [Pg.4455]

Other optical and spectroscopic techniques are also important, including positron annihilation lifetime spectroscopy, spectroscopic ellip-sometry, confocal Raman spectroscopy, and photoluminescence spectroscopy. Surface-enhanced Raman spectroscopy has been made tunable using gold nanorods and strain control on elastomeric PDMS substrates. ... [Pg.69]

Raman spectroscopy, a very important technique of classical spectroscopy, has been revolutionized by the use of lasers. Not only spontaneous Raman spectroscopy with greatly enhanced sensitivity, but also new techniques such as induced Raman spectroscopy, surface-enhanced Raman spectroscopy, or coherent anti-Stokes Raman spectroscopy (CARS) have contributed greatly to the rapid development of sensitive, high-resolution detection of molecular structure and dynamics, as is outlined in Chap. 8. [Pg.3]

Surface high-energy electron diffraction Scanning electron microscope Surface-enhanced Raman spectroscopy Surface-enhanced resonance Raman spectroscopy... [Pg.285]

Keywords UV Ultraviolet spectroscopy FUV spectroscopy DUV spectroscopy Plasmonically enhance spectroscopy Surface-enhance Raman scattering Electronic transition Rydberg transition Molecular imaging Near-field microscopy Photocatalysis... [Pg.1]

The Structure of the Metal-Vacuum Interface The Study of Simple Consecutive Processes in Electrochemical Reactions Surface Analysis by Electron Spectroscopy Surface-Enhanced Raman Scattering (SERS Surface Potential at Liquid Interfaces Surface States on Semiconductors... [Pg.474]