One-Step Index-Tunable Antireflection Coatings from Aggregated Silica Nanoparticles
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- 作者：Kevin T. Cook ; Kwadwo E. Tettey ; Robert M. Bunch ; Daeyeon Lee ; Adam J. Nolte
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：December 26, 2012
- 年：2012
- 卷：4
- 期：12
- 页码：6426-6431
- 全文大小：298K
- 年卷期：v.4,no.12(December 26, 2012)
- ISSN：1944-8252
文摘
We demonstrate a method for producing thickness- and refractive index-tunable antireflection coatings utilizing a one-step spin coating procedure with silica nanoparticle solutions. Aging nanoparticle solutions under controlled pH and temperature induces aggregation, allowing precise control of the porosity and refractive index of the spin-processed coating. Coating thickness measurements as a function of solution aging time and temperature allow for determination of the activation energy of the reaction-limited aggregation process. We demonstrate optimization of the antireflection effect for a single-layer silica nanoparticle coating on glass, and suggest that the aggregation method may be generalized to various other nanoparticle-based assemblies.