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10 October 2007 The role of surface adsorption in surface-enhanced Raman scattering from Benzene thiols
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Abstract
The origins of the surface-enhanced Raman (SERS) effect have been widely studied and are generally accepted as understood. However, there is still a need to provide a satisfactorily complete model which addresses the well known phenomena in which some molecules exhibit weak or even no SERS response at all. The relative intensities of vibrational modes observed in SERS can depend strongly on the mechanism of surface adsorption, such as bond type (covalent/noncovalent) and number of covalent bonds. Thus, in this experimental study the role of surface adsorption in surface-enhanced Raman scattering is investigated. A simple group of Benzene thiols was chosen to facilitate comparison with theoretical models. Experimental results with consideration towards surface bond strengths and reduction in degrees of freedom due to single and multiple surface bonds is presented and their effect on the relative intensities and positions of observed vibrational modes observed in the SERS spectra are discussed. The relative stability of molecules in the presence of nanostructures exhibiting strong and weak local electric fields will also be presented and discussed.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. A. Alexson, O. J. Glembocki, S. M. Prokes, R. W. Rendell, S. C. Badescu, J. Onuegbu, and C. M. Hosten "The role of surface adsorption in surface-enhanced Raman scattering from Benzene thiols", Proc. SPIE 6768, Nanomaterials Synthesis, Interfacing, and Integrating in Devices, Circuits, and Systems II, 67680S (10 October 2007); https://doi.org/10.1117/12.752592
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