Control of specular and diffuse reflection of light using particle self-assembly at the polymer and metal interface

Jin Soo Ahn, Troy R. Hendricks, Ilsoon Lee

    Research output: Contribution to journalArticle

    • 12 Citations

    Abstract

    We present a novel method of controlling the specular and diffuse reflection of light by the electrostatic deposition of a spherical particle monolayer followed by electroless plating. Charged polystyrene colloidal particles, ranging in size from 100 nm to 5 μm, were adsorbed from solution onto oppositely charged polyelectrolyte multilayers (PEM). The monodisperse particle monolayers were coated with nickel in a two-step electroless plating process using palladium catalysts. These surfaces can be used as diffusive metal reflectors with a uniformly controlled surface roughness due to the uniform size of deposited particles. In addition, the self-assembled particles at the polymer and metal interface deflected the internal stresses that build-up at the interface while the metal was being deposited. This allowed a thicker metal film to be deposited before delamination occurred. A UV-VIS spectrometer with movable fiber optic cables was employed to characterize the optical properties of the reflectors. The optical fibers permit versatile and precise measurements of specular and diffuse reflectance. By measuring the angular dependent reflectance, we demonstrate how to estimate the distribution of reflected light from the nickel coated surface and how to calculate the ratio of specular and diffuse reflection in the total reflected light. Optical measurements of our nickel samples showed that this approach could be used to control the portion of diffuse reflection from 8.25 to 59.97 %. Additionally, a quartz crystal microbalance was employed to study the electroless nickel plating rate on PEM. Our proposed method is simple, cost-effective and convenient for mass production because the process consists of a series of simple immersion steps without vacuum technology or special equipment.

    Original languageEnglish (US)
    Pages (from-to)3619-3625
    Number of pages7
    JournalAdvanced Functional Materials
    Volume17
    Issue number17
    DOIs
    StatePublished - Nov 23 2007

    Profile

    Adnexal Diseases
    Metals
    nickel
    metals
    Greenland
    plating
    Electroless plating
    Nickel
    Edema Disease of Swine
    Buccal Administration
    Clemastine
    Magnesium Deficiency
    Blood Flow Velocity
    Micelles
    reflectors
    reflectance
    polymers
    Polyelectrolytes
    Monolayers
    Multilayers

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Materials Science(all)
    • Condensed Matter Physics
    • Physics and Astronomy (miscellaneous)

    Cite this

    Control of specular and diffuse reflection of light using particle self-assembly at the polymer and metal interface. / Ahn, Jin Soo; Hendricks, Troy R.; Lee, Ilsoon.

    In: Advanced Functional Materials, Vol. 17, No. 17, 23.11.2007, p. 3619-3625.

    Research output: Contribution to journalArticle

    Ahn, Jin Soo; Hendricks, Troy R.; Lee, Ilsoon / Control of specular and diffuse reflection of light using particle self-assembly at the polymer and metal interface.

    In: Advanced Functional Materials, Vol. 17, No. 17, 23.11.2007, p. 3619-3625.

    Research output: Contribution to journalArticle

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