Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

To achieve self-cleaning at a low maintenance cost, we investigated the possibility of obtaining a sustainable hydrophilic surface of TiO2 thin film. As the hydrophilicity of TiO2 films fabricated by FTS has not yet been studied, we deposited TiO...

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Autores principales:	Sangbin Park, Younghwa Yoon, Sehyun Lee, Taejun Park, Kyunghwan Kim, Jeongsoo Hong
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	TiO<sub>2</sub> hydrophilicity thermoinduced photoinduced thin film Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/4cac19cd75e94132bc5c90a3af36b709
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spelling	oai:doaj.org-article:4cac19cd75e94132bc5c90a3af36b7092021-11-25T17:16:28ZThermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film10.3390/coatings111113602079-6412https://doaj.org/article/4cac19cd75e94132bc5c90a3af36b7092021-11-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1360https://doaj.org/toc/2079-6412To achieve self-cleaning at a low maintenance cost, we investigated the possibility of obtaining a sustainable hydrophilic surface of TiO<sub>2</sub> thin film. As the hydrophilicity of TiO<sub>2</sub> films fabricated by FTS has not yet been studied, we deposited TiO<i><sub>x</sub></i> using FTS, and then TiO<sub>2</sub> was formed through additional treatment. Hydrophilic surfaces were obtained by thermoinduced and photoinduced methods. UV irradiation led to the conversion of Ti<sup>4+</sup> to Ti<sup>3+</sup> in the lattice structure and an increase in the number of OH groups on the surface, and annealing induced the formation of Ti<sup>3+</sup> defect sites, as well as organic degradation and changes in the crystal structure. Through the annealing process, the water contact angle of as-deposited film was decreased from 78.7° to 35.7°, and crystallinity changed from amorphous to anatase. These changes contributed to the formation of a hydrophilic surface and reduced the water contact angle by up to 10.8°. After the formation of a hydrophilic surface through annealing and UV irradiation, the sample returned to its original state. We confirmed that the water contact angle of the returned sample was decreased through exposure to sunlight; it reduced the water contact angle of the returned sample by 15.2°. Thus, the results revealed that the crystallinity influences the hydrophilicity and its sustainability for TiO<sub>2</sub> films under sunlight.Sangbin ParkYounghwa YoonSehyun LeeTaejun ParkKyunghwan KimJeongsoo HongMDPI AGarticleTiO<sub>2</sub>hydrophilicitythermoinducedphotoinducedthin filmEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1360, p 1360 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	TiO<sub>2</sub> hydrophilicity thermoinduced photoinduced thin film Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	TiO<sub>2</sub> hydrophilicity thermoinduced photoinduced thin film Engineering (General). Civil engineering (General) TA1-2040 Sangbin Park Younghwa Yoon Sehyun Lee Taejun Park Kyunghwan Kim Jeongsoo Hong Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film
description	To achieve self-cleaning at a low maintenance cost, we investigated the possibility of obtaining a sustainable hydrophilic surface of TiO<sub>2</sub> thin film. As the hydrophilicity of TiO<sub>2</sub> films fabricated by FTS has not yet been studied, we deposited TiO<i><sub>x</sub></i> using FTS, and then TiO<sub>2</sub> was formed through additional treatment. Hydrophilic surfaces were obtained by thermoinduced and photoinduced methods. UV irradiation led to the conversion of Ti<sup>4+</sup> to Ti<sup>3+</sup> in the lattice structure and an increase in the number of OH groups on the surface, and annealing induced the formation of Ti<sup>3+</sup> defect sites, as well as organic degradation and changes in the crystal structure. Through the annealing process, the water contact angle of as-deposited film was decreased from 78.7° to 35.7°, and crystallinity changed from amorphous to anatase. These changes contributed to the formation of a hydrophilic surface and reduced the water contact angle by up to 10.8°. After the formation of a hydrophilic surface through annealing and UV irradiation, the sample returned to its original state. We confirmed that the water contact angle of the returned sample was decreased through exposure to sunlight; it reduced the water contact angle of the returned sample by 15.2°. Thus, the results revealed that the crystallinity influences the hydrophilicity and its sustainability for TiO<sub>2</sub> films under sunlight.
format	article
author	Sangbin Park Younghwa Yoon Sehyun Lee Taejun Park Kyunghwan Kim Jeongsoo Hong
author_facet	Sangbin Park Younghwa Yoon Sehyun Lee Taejun Park Kyunghwan Kim Jeongsoo Hong
author_sort	Sangbin Park
title	Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film
title_short	Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film
title_full	Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film
title_fullStr	Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film
title_full_unstemmed	Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film
title_sort	thermoinduced and photoinduced sustainable hydrophilic surface of sputtered-tio<sub>2</sub> thin film
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/4cac19cd75e94132bc5c90a3af36b709
work_keys_str_mv	AT sangbinpark thermoinducedandphotoinducedsustainablehydrophilicsurfaceofsputteredtiosub2subthinfilm AT younghwayoon thermoinducedandphotoinducedsustainablehydrophilicsurfaceofsputteredtiosub2subthinfilm AT sehyunlee thermoinducedandphotoinducedsustainablehydrophilicsurfaceofsputteredtiosub2subthinfilm AT taejunpark thermoinducedandphotoinducedsustainablehydrophilicsurfaceofsputteredtiosub2subthinfilm AT kyunghwankim thermoinducedandphotoinducedsustainablehydrophilicsurfaceofsputteredtiosub2subthinfilm AT jeongsoohong thermoinducedandphotoinducedsustainablehydrophilicsurfaceofsputteredtiosub2subthinfilm
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Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO<sub>2</sub> Thin Film

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