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Volume 4, Issue 4 (Suppl) J Laser Opt Photonics, an open access journal
ISSN: 2469-410X Optics 2017
November 15-17, 2017
November 15-17, 2017 | Las Vegas, USA
8th International Conference and Exhibition on
Lasers, Optics & Photonics
Active gap SERS with plasmonic nanostructures on hydrogels for the sensitive detection of
biomacromolecules
Kuniharu Ijiro
Hokkaido University, Japan
Surface-enhanced Raman scattering (SERS) is a promising approach for the label-free detection of molecules. The morphology
of metal nanostructures is a primary factor determining the magnitude of signal enhancement on Raman scattering. In general,
a narrower gap can form a stronger electromagnetic field, but it makes insertion of analytes into a hot spot more difficult. This is a
trade-off when using conventional SERS substrates. 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 transfer 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. This
method can be served for the sensing of macromolecules such as proteins.
Biography
Kuniharu Ijiro received his Doctor of Engineering degree from Tokyo Institute of Technology, Japan in 1991. He worked as an Alexander von Humboldt Foundation Research
Fellow at Ringsdorf’s group in Johannes Gutenberg University Mainz, Germany. He is working as the Professor and concurrently the Deputy Director of the Research Insti-
tute for Electronic Science (RIES) and the Professor of the Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University. He is interested in
biomimetic self-assembly of nanomaterials and polymers to create novel functions.
Kuniharu Ijiro, J Laser Opt Photonics 2017, 4:4 (Suppl)
DOI: 10.4172/2469-410X-C1-017