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pH-Induced antireflection coatings derived from hydrogen-bonding-directed multilayer films
Yingxi Lu1, Yeon Joo Choi, Ho Sun Lim
1Department of Chemical Engineering, Polymer Research Institute, Pohang University of Science and Technology, Pohang 790-784, Korea.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 1, 2010
Summary
Researchers created tunable antireflection films using block copolymer micelles and poly(4-vinylpyridine). Adjusting polymer content controlled film thickness, while pH changes created a honeycomb texture and tunable refractive index for high transmittance films.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Layer-by-layer assembly is a versatile technique for fabricating thin films.
- Block copolymers offer unique self-assembly properties for material design.
- Hydrogen bonding can be utilized to direct supramolecular assembly.
Purpose of the Study:
- To fabricate hydrogen-bonding-directed layer-by-layer assembled films using block copolymer micelles and poly(4-vinylpyridine).
- To investigate the effect of poly(acrylic acid) content on film growth and thickness.
- To explore the potential for creating tunable antireflection films with controlled optical properties and surface morphology.
Main Methods:
- Fabrication of layer-by-layer films in methanol using polystyrene-block-poly(acrylic acid) (PS-b-PAA) micelles and poly(4-vinylpyridine) (P4VP).
- Control over film growth by varying the PAA content in the PS-b-PAA micelles.
- Treatment of the assembled films with an aqueous HCl solution (pH 2.27) to induce pH-triggered changes.
Main Results:
- Successful fabrication of multilayer films with thickness controlled by PAA content.
- Achieved tunable antireflection films with refractive indices ranging from 1.58 to 1.28.
- Obtained high transmittance up to 98.4% after acid treatment.
- Observed pH-induced polymer reorganization leading to a porous honeycomb-like texture.
Conclusions:
- Hydrogen-bonding interactions effectively direct the layer-by-layer assembly of block copolymer-based films.
- The PAA content in PS-b-PAA micelles is a critical parameter for controlling multilayer film thickness.
- Acid treatment provides a method for tuning the refractive index and creating unique porous nanostructures in the films, suitable for antireflection applications.
