Fabrication of gold-silver bimetal nanoparticles/silicon nanoporous pillar array substrate and surface-enhanced Raman scattering detection

A novel gold-silver/silicon nanoporous pillar array substrate was prepared by a droplet-confined deposition technique and a replacement reaction method. Its surface-enhanced Raman scattering behaviors to R6G were studied. The substrate has not only high detection sensitivity, but also good signal uniformity and stability. The SERS detection limit is down to 10 –13 M. The enhancement factor is 2.9 × 10 5 and the maximal relative standard deviation is only 9.2% at 10 –7 M R6G. Moreover, it has a well stability with a slight drop in the spectrum intensity after placed for 35 days in air. This work suggested that the novel substrate has a potential application in environmental detection.