A highly sensitive
multilayer interlaced silver (Ag) nanosheet
(MISN) film was prepared on a PPy@PEDOT:PSS film via an electrodeposition
method for surface-enhanced Raman scattering (SERS) applications.
After the PPy@PEDOT:PSS film was pretreated with ascorbic acid solution,
many sparse Ag nanoparticles (NPs) could be directly reduced on the
surface of the PPy@PEDOT:PSS film in AgNO
3
solution. Then,
the MISN film was directionally grown along the surface of sparse
Ag NPs by using an electrochemical galvanostatic method to form a
Ag/PPy@PEDOT:PSS film for a SERS substrate. The results indicated
that with the increase in electrodeposition time, the density of Ag
nanosheets was also increased for boosting the SERS effect. Accordingly,
owing to the directional growth of Ag NPs, the increase in the length–width
ratio of single Ag nanosheets would further promote the SERS signal
of the substrate. Moreover, the maximum enhancement factor of the
SERS substrate could reach to 12,478, and the minimum limit of detection
of melamine solution was down to 5.42 ng/mL. The SERS sensitivity
of the Ag nanosheet film reached 100.65. This method of preparing
the SERS substrate provides a novel and robust strategy for the low-cost
and high-sensitivity detection in biomedicine, drugs, and food.
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