Direct visualization of molecular scale chemical adsorptions on solids using plasmonic nanoparticle arrays

    Authors

    C. M. Wang; L. Y. Ma; M. Hossain; H. N. Wang; S. L. Zou; J. J. Hickman;M. Su

    Comments

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    Abbreviated Journal Title

    Sens. Actuator B-Chem.

    Keywords

    Plasmonic nanoparticles; Visual detection; Adsorption; Molecular thin; film; Mercury; SILVER NANOPARTICLES; ULTRASENSITIVE DETECTION; NANOSPHERE LITHOGRAPHY; HG ADSORPTION; GOLD-FILMS; REAL-TIME; MERCURY; SURFACE; RESONANCE; SENSOR; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

    Abstract

    The fast and sensitive detections of chemicals adsorption onto solid substrates are of importance to many fields Ordered arrays of gold or silver nanoparticles with strong surface plasmon resonances allow directly visualized detections of molecular scale adsorptions of polymer multilayers an explosive derivative and mercury vapor on solid substrates The adsorbed species change local dielectric constants surrounding plasmomc nanoparticles leading to shifts of plasmon resonance peaks into either long or short wavelength direction depending on interactions of chemicals with nanoparticles The magnitude of peak shifts is proportional to the amount of adsorbed chemicals in certain range and is sufficiently large so that color changes can be seen directly by naked eyes The ordered nanoparticles can be made over a large area at high yield allowing a quantitative passive and sensitive detection of molecular species (C) 2010 Elsevier B V All rights reserved

    Journal Title

    Sensors and Actuators B-Chemical

    Volume

    150

    Issue/Number

    2

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    667

    Last Page

    672

    WOS Identifier

    WOS:000284339800025

    ISSN

    0925-4005

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