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Immobilization of Gold Nanorods onto Electrospun Polycaprolactone Fibers Via Polyelectrolyte DecorationA 3D SERS Substrate
journal contribution
posted on 2013-11-19, 00:00 authored by Wenqiong Tang, D. Bruce Chase, John F. RaboltWe
report the fabrication of a homogeneous and highly dense gold
nanorod (AuNR) assembly on electrospun polycaprolactone (PCL) fibers
using electrostatic interaction as the driving force. Specifically,
decoration of a poly(sodium 4-styrenesulfonate) (PSS) layer
onto the AuNRs imposed negative charges on the nanorod surface, and
the interactions between PSS and the AuNRs were investigated using
attenuated total reflection Fourier transform infrared spectroscopy
(ATR-FTIR). Positive charges on the PCL fibrous substrate were established
via polyelectrolyte layer-by-layer deposition, which was investigated
using multiple characterization techniques. Driven by the attractive
electrostatic interaction, immobilization of AuNRs on the PCL fibers
was initiated upon substrate immersion, and the kinetics of the immobilization
process were studied using UV–vis spectroscopy. Electron microscopy
characterization of the AuNR/PCL nanocomposite fibers reveals a uniform
AuNR coating on the fiber surface with the immobilized AuNR density
being high enough to provide full surface coverage. By using both
4-mercaptopyridine and Rhodamine 6G as probe molecules, the performance
of the AuNR/PCL fibrous mesh as a three-dimensional (3D) surface-enhanced
Raman scattering (SERS) substrate was investigated. The nanocomposite
fibers allowed detection at concentrations as low as 10–7 M of the probe molecule in solution and exhibited excellent reproducibility
in the SERS measurements. In addition, a comparison between the 3D
AuNR/PCL fibrous mesh and a 2D AuNR/PCL film reveals that the enhanced
surface area in the 3D substrate effectively improved the SERS performance
with a 6-fold increase in the Raman intensity.
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Keywords
surface areaPCL fibersgold nanorodnanocomposite fiberssurface coveragePositive charges3 D substrateAuNR densitycharacterization techniquesGold Nanorodsreflection Fouriersubstrate immersionUVPSSRhodamine 6 GRaman intensitynanorod surfaceelectrospun polycaprolactoneimmobilization processelectron microscopy characterizationSERS performanceprobe moleculeSERS measurementsfiber surfaceprobe moleculesuniform AuNR coating
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