[14a-3A-1~8] English session: Asian Joint Symposium on Nanobiotechnology

▲ [14a-3A-5] Plasmonic nanostructures based on self-assembled nanoparticles for biosensing

〇Kuniharu Ijiro¹ (1.Hokkaido Univ.)

Keywords:nanoparticle,plasmon,self-assembly

We have fabricated tunable plasmonic nanostructures, the gap distances of which can be controlled by the salt concentration, through the formation of gold nanoparticle self-assembled thin films on solid substrates and their transferral onto poly-acrylic acid gel. The extinction spectra shifted reversibly with volume change of the gel according to the degree of swelling. When the target molecules were injected onto this substrate as the gaps were opened (widened) and SERS was measured after the gaps were closed (narrowed), the signals became stronger than that observed without any gap control. In the case of hemoglobin, as hemoproteins, signal intensities increased 10 fold and over with this active gap control.