YOU can apply star-shaped template and cover it with gold, like it was done in the case of magnetic nanoroods, publication is attached.

Article Magnetic Gold Nanoparticles in SERS-Based Sandwich Immunoass...

thank u Sir, but we eventually want to bind these particles on microstructure made from a polymer resist,which is another fictionalization step

You could do EBL (Electron Beam Lithography) to get some useful results in the nanometer length scale.

it is easy by wet chemical method. There are many references.

in JPCC (ACS) there are three four refernces. and it is to make also.

Thanks, could u send me some paper or references?thks

Precursor-Driven Nucleation and Growth Kinetics of Gold Nanostars

Hello, may be this new paper is also good for you:

"Gold nanostar substrates for SERS-based chemical sensing in the femtomolar regime "

Nanoscale, 2014,6, 8891-8899

thanks you Zsusza for the reply, could you also send me the paper pdf, i cant access it here, thanks, i hope you are doing good in Berlin