Authors
Title
Femtosecond Direct Laser-Induced Assembly of Monolayer of Gold Nanostructures with Tunable Surface Plasmon Resonance and High Performance Localized Surface Plasmon Resonance and Surface Enhanced Raman Scattering Sensing
In
LANGMUIR
Volume
34
Pages
15763–15772
Publisher
ACS
Year
2018
Indexed by


Abstract
We show femtosecond direct laser-induced
assembly of gold nanostructures with plasmon resonance band
variable as a function of laser irradiation in a wide range of
visible wavelengths. A system of 2-photon lithography is used
to achieve site-selectively controlled dewetting of a thin gold
film into nanostructures in which size and shape are highly
dependent on the laser power. Simultaneous measurements of
localized surface plasmon resonance (LSPR) and surface
enhanced Raman scattering (SERS) in the presence of various
concentrations of trans-1,2-bis(4-pyridyl) ethylene (BPE) as
target molecule are performed in order to highlight the
relationship between structural dimensions, plasmonic effect,
and detection activity. The resulting gold NPs exhibit high
sensitivity as both LSPR and SERS sensors and allow the detection of picomolar concentrations of BPE with a SERS enhancement factor (SEF) of 1.33 × 10^9 and a linear detection range between 10^−3 and 10^−12 M.
Affiliations
Offprint