Abstract
The New noble metal nanostructure for surface enhanced Raman scattering (SERS) detection in microfluidic devices was developed. In this nanovalley structure, gold nanoparticles of 40 nm diameter were assembled along grooves of 200 nm deep which were fabricated on Polydimethylsiloxane (PDMS) by the nanoimprint method. Localized plasmon resonance of the assembled gold nanoparticles in the nanovalley was expected in the near infrared region. The rapid signal response and long term stability of SERS spectra of 4,4'-Bipyridine (4bpy) aqueous solution by 785 nm irradiation were demonstrated. As for an in situ SERS measurement where the nanovalley structure was immersed in 4bpy aqueous solution, SERS appeared within 5 s after the immersion and the SERS intensity almost maintained constant value for 20 h. These results were compared to those obtained using commercial SERS nanophotonic substrate and the advantage of the nanovalley structure was discussed. It is thought that the unique nanovalley structure caused excellent effects for SERS measurements, and the availability of the nanovalley structure as detector of microfluidic device was sufficiently shown.
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