Abstract
In this paper we studied the fabrication of a family of new biodegradable SERS sensors using a gold coated zein film with inverted pyramid structures that we had fabricated previously and coupled it with deposition of gold, silver and silver-shelled-gold nanoparticles. The proximity and contact between the gold surface and the new added nanoparticles help create new hot spots, which enhance the SERS intensity. Rhodamine 6 G was used as the Raman active molecule to evaluate the SERS enhancement effect. Results revealed that different nanoparticles exhibit different SERS effects. Silver-shelled-gold nanoparticles gave the highest enhancement factor of 3 × 105 followed by silver and gold nanoparticles relative to a glass surface. The enhancement factor of the new silver-shelled-gold nanoparticle decorated platform with the best performance relative to the gold coated zein nanophotonic structures is 102, a remarkable improvement. This sensitivity improvement takes the newly developed zein based biodegradable SERS biosensor platform one step closer to non-biodegradable sensors.
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