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

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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.

LanguageEnglish (US)
Pages3619-3625
Number of pages7
JournalAdvanced Functional Materials
Volume17
Issue number17
DOIs
StatePublished - Nov 23 2007

Profile

specular reflection
Self assembly
self assembly
Polymers
Metals
Electroless plating
Nickel
plating
nickel
polymers
metals
Polyelectrolytes
reflectors
Monolayers
Multilayers
Vacuum technology
Ultraviolet spectrometers
reflectance
Nickel plating
Optical cables

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

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