Can anyone explain the attached patterns seen for CV/R6G (Raman dye molecules) on bare gold?

The attachment shows Rhodamine 6G or Crystal Violet (I cannot recall which Raman dye was used unfortunately, but it was certainly one of these two) drop-cast (2 μl volume - solvent DI water; 10 μM...

11 November 2016 1,762 2 View