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    Bilayer coatings based on silica materials and iron (III) phthalocyanine Sensitized TiO2 photocatalyst

    Year: 2021

    Journal: Mater. Res. Bull., Volume 138, JUN

    Authors: Purcar, Violeta; Raditoiu, Valentin; Raditoiu, Alina; Raduly, Florentina Monica; Manea, Raluca; Frone, Adriana; Anastasescu, Mihai; Ispas, Georgiana Cornelia; Caprarescu, Simona

    Organizations: Romanian Ministry of Research and Innovation, PCCDI-UEFISCDI within PNCDI III [PN-III-P1-1.2-PCCDI-2017-0428, 40PCCDI]; INCDCP ICECHIM Bucharest 2019-2022 Core Program [PN. 19.23-Chem-Ergent, 19.23.03.04]

    Keywords: Thin films; Sol-gel chemistry; Surface properties

    This study presents a sol-gel method for preparation of bilayer coatings based on silica materials and iron (III) phthalocyanine - sensitized TiO2 nanoparticles (TiO2-Fe(III)Pc), deposited on glass surfaces. Silica materials were synthetized using organosilane precursors (dimethoxydimethylsilane (DMDMES), octyltriethoxysilane (OTES), and/or hexadecyltrimethoxysilane (HDTMES)), with a two-step acid reaction. The materials properties have been investigated using FT-IR and UV-vis spectroscopy, AFM analysis, and water contact angle. The photo-degradation experiments of thin films were developed using methylene blue as a standard contaminant. FT-IR spectra confirmed the successful grafting of silica materials onto the surface of TiO2-Fe(III)Pc nanoparticles. AFM analysis indicated that the thin films present a different nanostructure depending on the silica matrix and the existence of TiO2-Fe(III)Pc nanoparticles. Contact angle measurements showed that sol-gel coatings exhibit hydrophobic behavior (>99 +/- 2 degrees), before and after photo-degradation test. The presence of nanoparticles plays an important role in the development of coatings with photo-catalytic property.
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