Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 136, Issue 30, Pages -Publisher
WILEY
DOI: 10.1002/app.47805
Keywords
blends; films; nanoparticles; nanowires; and nanocrystals; optical and photovoltaic applications; surfaces and interfaces
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Funding
- Sao Paulo Research Foundation (FAPESP) [2013/07296-2, 2013/09963-6, 2014/01713-3, 2015/23000-1, 2017/11072-3]
- Coordination for the Improvement of Higher Education Personnel (CAPES)
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Melanin is a biopigment in many organisms with interesting intrinsic properties suitable for emerging and sustainable technologies. In this work, we report the fabrication of transparent ultraviolet (UV)-protective thin films based on synthetic melanin in poly(vinyl alcohol) (PVA) matrixes. Melanin was synthesized through the auto-oxidation of l-3,4-dihydroxyphenylalanine (l-DOPA) under oxygen pressure, resulting in excellent solubility in water. A thin film with a composition of 3 wt % melanin (synthesized at 6 atm oxygen pressure) and silver nanowires (AgNWs) deposited on the surface has good transparency in visible light and 100% UV irradiation photoprotection. Encapsulated PVA-melanin/AgNW films dipped in water for 7 days retained 98% of their UV irradiation photoprotection. Moreover, using a transparent conductive oxide substrate, this UV-protective system can be simultaneously used as a transparent capacitor. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47805.
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