Subwavelength Hollow-Nanopillared Glass with Gradient Refractive Index for Ultralow Diffuse Reflectance and Antifogging
| Autor: | Sahn Nahm, Myoung-Woon Moon, Kyoo-Chul Park, Young-A Lee, Sun Mi Yoon |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Plasma etching business.industry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Superhydrophilicity Etching (microfabrication) Transmittance Optoelectronics General Materials Science Diffuse reflection Nanodot 0210 nano-technology business Refractive index Nanopillar |
| Zdroj: | ACS Applied Materials & Interfaces. 12:6234-6242 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b19228 |
| Popis: | Nanostructured glass with subwavelength hollow nanopillars of diameters of sub-65 nm was fabricated, showing high optical transmittance and ultralow diffuse reflectance. A simple process involving single-step plasma etching was used on a glass slide coated with a SiO2 sacrificial film. First, SiO2 nanodot structures were formed using plasma-induced anisotropic etching with CF4 plasma. The SiO2 nanodot array then became a secondary etching mask to form hollow nanopillars on the glass. The hollow structures formed at the upper part reaching up to the apex of the nanopillar had a lower solid fraction, while the lower part had a higher fraction. The refractive index (RI) gradually increased from 1.09 (near the value for air) to 1.42 (near the value for glass). Geometry-induced RI gradient enhanced light transmi, while it significantly reduced diffuse reflectance, particularly in the shorter wavelengths, thus suppressing the haziness or milky appearance of the nanostructured glass. Superhydrophilic and antifog... |
| Databáze: | OpenAIRE |
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