Dual-mode sensing platform based on colloidal gold functionalized porous silicon

Yang Jiao, Dmitry S. Koktysh, Nsoki Phambu, Sharon M. Weiss
2010 Applied Physics Letters  
We report a dual-mode sensing platform based on a single layer porous silicon ͑PSi͒ film impregnated with colloidal gold nanoparticles. This gold-coated PSi film supports both quantification of molecular binding via reflectance measurements and molecular identification via surface enhanced Raman scattering ͑SERS͒. A detection sensitivity of approximately 400 nm/RIU was demonstrated through binding of benzenethiol molecules. Identification of the unique SERS peaks was possible with uniform
more » ... with uniform signal intensity across the sample and a detection limit below 1 M.
doi:10.1063/1.3503608 fatcat:enwthgzvufbythzfmahmwqpf34