Observation of Enhanced Raman Scattering for Molecules Adsorbed on TiO2 Nanoparticles: Charge-Transfer Contribution
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Abstract:
Surface-enhanced Raman scattering from molecules adsorbed on TiO2 nanoparticles has been observed. This is attributed to the dominant contribution of the TiO2-to-molecule charge-transfer mechanism. The charge-transfer process is largely dependent on the intrinsic nature of the adsorbed molecules and the surface properties of the semiconductor. Both the stronger electron attracting ability of groups para- to the mercapto group bonded with TiO2 surface and the plentiful surface states of TiO2 nanoparticles are favorable to TiO2-to-molecule charge-transfer and SERS for molecules adsorbed on TiO2.Keywords:
Surface charge
The unique ability to obtain molecular recognition of an analyte at very low concentrations in situ in aqueous environments using surface enhanced Raman scattering (SERS) and surface enhanced resonance Raman scattering (SERRS) detection makes these spectroscopies of considerable interest. Improved understanding of the effect coupled to improvements in practical techniques make the use of SERS/SERRS much simpler than has been the case in the past. This article is designed as a tutorial review targeted at aiding in the development of practical applications.
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Abstract While surface‐enhanced Raman scattering (SERS) is an established technique to significantly enhance the Raman signal from samples bound to metal surfaces, a quantitative interpretation is very difficult because of the rough and arbitrary nature of the substrate. A distinction between concentration and enhancement effects is virtually impossible. Tip‐enhanced Raman scattering (TERS), a scattering type of near‐field optical microscopy technique, circumvents the problem of random enhancement by concentrating the roughness to only a small region directly at the apex of a scanning probe tip. In this paper, TERS spectra of DNA pyrimidine bases have been collected and compared with standard SERS and Raman measurements of the nucleotides and the pure bases. The results are discussed in terms of electromagnetic and chemical effects of the SERS enhancement of the TERS probes. Copyright © 2006 John Wiley & Sons, Ltd.
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Liquid nitrogen
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Surface charge accumulation phenomena on insulating epoxy spacer are measured under DC-GIS simulated environment. Homo-charges are accumulated near the electrodes, and charge injection from the electrodes is assumed to be dominant in surface charge accumulation. The surface charge is saturated at a time constant of 1000 hours below 20°C, and the saturated charge amount tends to increase with room temperature rising.
Surface charge
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Abstract Simultaneous bidirectional forward and backward electron transfers take place on a light‐exited semiconductor particle, even at the same geometric site. The potentials of the electron pathways are different, giving rise to two independent molecular conversion reactions. This type of multi‐electron transfer reactions is overviewed and the stepwise unidirectional multi‐electron transfer on the excited semiconductor particle is also described.
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The theory of Raman scattering,the characteristic,enhanced mechanism and the progress of the Surface-Enhanced Raman Scattering are reported in this paper.It's an accepted view that the mechanism of electromagnetic enhancement and the mechanism of chemical enhancement are simultaneously in existence and only differ in their significance in different experiment.
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