Synthesis of the 3D AgNF/AgNP arrays for the paper-based surface enhancement Raman scattering application

•Ag nanoflowers connected with Ag nanoparticles arrays are proposed and obtained onto “vase”-like surface or defects to enhance the EM coupling.•Multiple cascaded amplification mechanisms of the incident laser can be used to promote the magnification of electric field.•Such paper card was exploited...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-07, Vol.265, p.302-309
Main Authors: Xu, Yuanyuan, Man, Peihong, Huo, Yanyan, Ning, Tingyin, Li, Chonghui, Man, Baoyuan, Yang, Cheng
Format: Article
Language:English
Subjects:
Biomolecules
Chemical synthesis
Coupling
Defect-guided growth
Defects
Electromagnetics
Nanoparticles
Paper-based SERS sensor
Pre-concentration
Raman spectra
Self-assembly
Sensor arrays
Sensors
Silver
Silver nanoflowers
Spectrum analysis
Standing waves
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Summary:•Ag nanoflowers connected with Ag nanoparticles arrays are proposed and obtained onto “vase”-like surface or defects to enhance the EM coupling.•Multiple cascaded amplification mechanisms of the incident laser can be used to promote the magnification of electric field.•Such paper card was exploited successfully as an integrated platform, allowing for ultra-sensitivity molecules detection.•Such paper card was potential to serve to swab real-world surface to maximize sample collection, which is practical and efficient Paper-based SERS sensor has attracted considerable attention recently, resulting from the separation, aggregation and high sensitive detection of biomolecules. However, optical losses, caused by the holes or “vase”-like defects, affect the overall intensity of the electromagnetic (EM) coupling and then the Raman signal. Silver nanoflowers (AgNFs) connected with silver nanoparticles (AgNPs) arrays are proposed and firstly obtained onto such “vase” surface to enhance the EM coupling. AgNFs are easily self-assembled on the defects, and the closed packed AgNPs can be formed on the other area. Multiple cascaded amplification mechanisms (localized surface plasmon mode and optical standing waves or refraction) are used to promote the EM magnification. Such paper card is also exploited successfully as an integrated platform, allowing for ultra-sensitivity (1 × 10−19M) CV and (1 × 10−20M) R6G detection.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2018.03.035