Inventors:
Michael J. Natan - Los Altos CA
Michael D. Musick - Huntingdon Valley PA
Christine Keating - Lemont PA
Kenneth R. Brown - Park City UT
Assignee:
Surromed, Inc. - Mountain View CA
International Classification:
G01J 344
Abstract:
Methods for preparing colloidal metal nanoparticles, in which seed colloids are added to a solution of reductant mixed with a solution containing a source of metal ions, include a method in which the seeds are colloidal gold nanoparticles, the source of gold ions is HAuCl , and the reductant is NH OH. SERS substrates are prepared by combining a colloidal gold monolayer with a solution containing a source of metal ions and a reductant such as NH OH.