I am looking for a dye molecule that I get the most Raman signal and therefore should have minimal fluorescence. my excitation wavelength is 785 nm.
thanks
Check the following. The semiconductor materials are in the range, Si!
I have no information about SERS graph of Cresyl Violet Perchloate dye (CVP dye), but it’s absorption peak is near 600 nm, as clear in the attached picture. This graph is obtained experimentally, however, you can see the accuracy of this graph by following this link.
http://omlc.org/spectra/PhotochemCAD/html/047.html
Dear Nahid,
what the Raman shift range you are interested in?
You can simply try rhodamine 6G, there is no need to fear the fluorescence at 785 nm excitation, since it is significant only at the low shifts (up to 300...400 cm-1). Furthermore, if you will use SERS, the fluorescence will be quenched. We use rhodamine 6G as a model dye, because its peaks are well-known and can be easily detected across the range we are interested (from 400 to 2000 cm-1).
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