3 research outputs found
Viable stretchable plasmonics based on unidirectional nanoprisms
Well-defined ordered arrays of plasmonic nanostructures were fabricated on stretchable substrates and tunable plasmon-coupling-based sensing properties were comprehensively demonstrated upon extension and contraction. Regular nanoprism patterns consisting of Ag, Au and Ag/Au bilayers were constructed on the stretchable polydimethylsiloxane substrate. The nanoprisms had the same orientation over the entire substrate (3 x 3 cm(2)) via metal deposition on a single-crystal microparticle monolayer assembly. The plasmonic sensor based on the Ag/Au bilayer showed a 6-fold enhanced surface enhanced Raman scattering signal under 20% uniaxial extension, whereas a 3-fold increase was observed upon 6% contraction, compared with the Au nanoprism arrays. The sensory behaviors were corroborated by finite-difference time-domain simulation, demonstrating the tunable electromagnetic field enhancement effect via the localized surface plasmon resonance coupling. The advanced flexible plasmonic-coupling-based devices with tunable and quantifiable performance herein suggested are expected to unlock promising potential in practical bio-sensing, biotechnological applications and optical devices.11Ysciescopu
Viable stretchable plasmonics based on unidirectional nanoprisms
Well-defined ordered arrays of plasmonic nanostructures were fabricated on stretchable substrates and tunable plasmon-coupling-based sensing properties were comprehensively demonstrated upon extension and contraction. Regular nanoprism patterns consisting of Ag, Au and Ag/Au bilayers were constructed on the stretchable polydimethylsiloxane substrate. The nanoprisms had the same orientation over the entire substrate (3 × 3 cm2) via metal deposition on a single-crystal microparticle monolayer assembly. The plasmonic sensor based on the Ag/Au bilayer showed a 6-fold enhanced surface enhanced Raman scattering signal under 20% uniaxial extension, whereas a 3-fold increase was observed upon 6% contraction, compared with the Au nanoprism arrays. The sensory behaviors were corroborated by finite-difference time-domain simulation, demonstrating the tunable electromagnetic field enhancement effect via the localized surface plasmon resonance coupling. The advanced flexible plasmonic-coupling-based devices with tunable and quantifiable performance herein suggested are expected to unlock promising potential in practical bio-sensing, biotechnological applications and optical devices
Large-Area Accurate Position Registry of Microparticles on Flexible, Stretchable Substrates Using Elastomer Templates
This
work introduces a robust means for excellent position registry of
microparticles via a forced assembly technique on flexible or stretchable
substrates. It is based on the dry powder rubbing process which allows
assembly of a microparticle monolayer in a short time without requiring
any solvent or thermal treatment. Elastic physical templates are used
as substrates for the forced assembly in this study. Since the elastic
templates can reduce the stress accumulation between the closely packed
particles, they can minimize the defect formation in the particle
assembly in large areas. The method can be used with powders comprising
irregularly shaped particles with a relatively large size distribution
that cannot be periodically ordered by conventional self-assembly.
Furthermore, a non-closely packed particle array can be fabricated
readily in large area, which is highly desirable for practical uses
of the particle monolayers. The particle monolayers formed on the
elastomer templates can be transferred to surfaces coated with thermoplastic
block copolymers. Once transferred, the particle monolayers are flexible
and stretchable over their entire surface. This work uses the particle
monolayers on a large-area flexible substrate as photomasks to produce
various photoresist patterns