Hello！

The AuNts I use were synthesized by a rapid one-pot seedless growth process with CTAC ; HAuCl4 ; L-ascorbic acid ; NaOH ; KI.

I plan to use 4-MBA to evaluate the SERS activity of the triangular nanoplate. In my previous experiment, I centrifuged the nano gold solution twice at 8000 rpm for 10 minutes. But unfortunately, as can be seem from the picture ,there are many impurity peaks in Raman spectrum, which i guess is the peak of CTAC.

I have tried many methods to elminate the peaks but falied.And I wonder how to wash Au nanotriangles before using it as the Raman substrate.

Thanks very much!