Sarkar, Uttam K. ; Pal, A. J. ; Chakrabarti, Subhasis ; Misra, T. N. (1992) Classical and chemical effects of SERS from 2,2':5,2" terthiophene adsorbed on Ag-sols Chemical Physics Letters, 190 (1-2). pp. 59-63. ISSN 0009-2614
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Official URL: http://www.sciencedirect.com/science/article/pii/0...
Related URL: http://dx.doi.org/10.1016/0009-2614(92)86102-N
Abstract
Surface-enhanced Raman scattering (SERS) has been observed from 2,2':5,2" terthiophene (3T) adsorbed on Ag-sols. Experimental results suggest that the absorbed 3T molecules are anti but twisted and that the twist angle is smaller in the surface-adsorbed state than in solution. The first-layer effect, i.e., maximum enhancement when a monomolecular layer of 3T is adsorbed on silver particles, has been observed for the first time in such SERS active surfaces. A charge-transfer model has been shown to contribute to this effect. On the other hand, the Raman excitation frequency dependence of the enhancement suggests a significant classical electromagnetic contribution to SERS in sol.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 65665 |
| Deposited On: | 17 Oct 2011 10:42 |
| Last Modified: | 17 Oct 2011 10:42 |
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