Polyelectrolyte Multilayers Stabilized Plasmonic Nanosensors

    Authors

    C. M. Wang; H. N. Wang; S. L. Zou;L. Y. Ma

    Comments

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    Abbreviated Journal Title

    Sens. Lett.

    Keywords

    Plasmonic Resonance; Nanoparticle Array; Nanosensor; Polyelectrolyte; Layers; SILVER NANOPARTICLES; SURFACE; FILMS; RESONANCE; GOLD; MICROCAPSULES; NANOSHELLS; MORPHOLOGY; PARTICLES; SUBSTRATE; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation; Physics, Applied

    Abstract

    Surface plasmon nanosensors based on noble metal nanoparticles can detect trace amounts of chemicals and biomolecules at low concentrations without labeling. Shifts in the resonance peaks are very sensitive to changes in local dielectric constants due to the large surface areas of nanoparticles. But, the structural changes of nanoparticles after preparation can also shift the resonance peaks, which bring the stability issue of such sensors and need an additional annealing process. To eliminate the annealing process of plasmonic nanosensors, polyelectrolyte multilayers are layer-by-layer deposited on an ordered array of silver nanoparticles generated by nanosphere lithography. The polymer nnultilayers stabilize the plasmonic resonance peaks of nanoparticles in air and liquid, and the resonance peaks shift towards long wavelength upon further attachments of polyelectrolyte films, exposures to chemicals and biomolecules. The optic transparency, easy deposition and quantitative response character of polyelectrolyte multilayer enhance the applicability of nanoparticle array based nanosensors in chemical and biological sensing.

    Journal Title

    Sensor Letters

    Volume

    11

    Issue/Number

    3

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    519

    Last Page

    525

    WOS Identifier

    WOS:000323236200012

    ISSN

    1546-198X

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