Photoinduced Superhydrophilicity of Titanium Dioxide: Effect of Heterovalent Doping with Metals.
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| Title: | Photoinduced Superhydrophilicity of Titanium Dioxide: Effect of Heterovalent Doping with Metals. |
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| Authors: | Rudakova, A. V.1 (AUTHOR) aida.rudakova@spbu.ru, Bulanin, K. M.1 (AUTHOR) |
| Source: | Colloid Journal. Oct2024, Vol. 86 Issue 5, p757-779. 23p. |
| Subjects: | Electron work function, Contact angle, Substrates (Materials science), Acidity function, Titanium dioxide |
| Abstract: | The self-cleaning effect of titanium dioxide coatings is based on the photocatalytic oxidative ability and the phenomenon of photoinduced superhydrophilicity. Doping with metals is used to enhance the photocatalytic activity; however, its influence on the surface hydrophilicity remains to be studied. In this work, the effect of the heterovalent doping of titanium dioxide anatase on its hydrophilic properties has been investigated in detail. Thin xM–TiO2 films, where the M symbol denotes Nb5+, Sc3+, and Al3+, with dopant concentrations of 0.0–1.0 at % have been obtained on glass substrates from solutions of corresponding sols by the deep coating method. The phase composition, surface dopant content, lattice microstress, surface acidity, and electron work function values have been determined and analyzed for three series of doped samples as functions of dopant concentrations. The surface hydrophilicity of xM–TiO2 nanocoatings has been estimated by measuring water contact angle and surface free energy values. It has been shown that doping with niobium ions affects the wettability of titanium dioxide, while its hydrophilic state remains unchanged upon doping with scandium and aluminum ions. It has been found that the incorporation of niobium ions into anatase drastically increases the hydrophilicity of the surface with a simultaneous change in its acidity and work function. At the same time, as Nb content increases, the electronic factor prevails. The kinetic dependences obtained for the photoinduced water contact angles have shown an increase in the surface hydrophilicity of all investigated coatings irrespective of a dopant type within the studied dopant concentration range, thereby indicating their self-cleaning ability. At the same time, the final UV-induced hydrophilic state depends on a dopant type. The maximum surface hydrophilicity is achieved upon UV irradiation of TiO2 doped with Nb regardless of its content. UV-irradiated Al-doped TiO2 coatings exhibit small contact angles, while the photoinduced surface hydrophilicity of Sc-doped titanium dioxide films decreases with increasing scandium concentration. [ABSTRACT FROM AUTHOR] |
| Copyright of Colloid Journal is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 180735029 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Photoinduced Superhydrophilicity of Titanium Dioxide: Effect of Heterovalent Doping with Metals. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rudakova%2C+A%2E+V%2E%22">Rudakova, A. V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> aida.rudakova@spbu.ru</i><br /><searchLink fieldCode="AR" term="%22Bulanin%2C+K%2E+M%2E%22">Bulanin, K. M.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Colloid+Journal%22">Colloid Journal</searchLink>. Oct2024, Vol. 86 Issue 5, p757-779. 23p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Electron+work+function%22">Electron work function</searchLink><br /><searchLink fieldCode="DE" term="%22Contact+angle%22">Contact angle</searchLink><br /><searchLink fieldCode="DE" term="%22Substrates+%28Materials+science%29%22">Substrates (Materials science)</searchLink><br /><searchLink fieldCode="DE" term="%22Acidity+function%22">Acidity function</searchLink><br /><searchLink fieldCode="DE" term="%22Titanium+dioxide%22">Titanium dioxide</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The self-cleaning effect of titanium dioxide coatings is based on the photocatalytic oxidative ability and the phenomenon of photoinduced superhydrophilicity. Doping with metals is used to enhance the photocatalytic activity; however, its influence on the surface hydrophilicity remains to be studied. In this work, the effect of the heterovalent doping of titanium dioxide anatase on its hydrophilic properties has been investigated in detail. Thin xM–TiO2 films, where the M symbol denotes Nb5+, Sc3+, and Al3+, with dopant concentrations of 0.0–1.0 at % have been obtained on glass substrates from solutions of corresponding sols by the deep coating method. The phase composition, surface dopant content, lattice microstress, surface acidity, and electron work function values have been determined and analyzed for three series of doped samples as functions of dopant concentrations. The surface hydrophilicity of xM–TiO2 nanocoatings has been estimated by measuring water contact angle and surface free energy values. It has been shown that doping with niobium ions affects the wettability of titanium dioxide, while its hydrophilic state remains unchanged upon doping with scandium and aluminum ions. It has been found that the incorporation of niobium ions into anatase drastically increases the hydrophilicity of the surface with a simultaneous change in its acidity and work function. At the same time, as Nb content increases, the electronic factor prevails. The kinetic dependences obtained for the photoinduced water contact angles have shown an increase in the surface hydrophilicity of all investigated coatings irrespective of a dopant type within the studied dopant concentration range, thereby indicating their self-cleaning ability. At the same time, the final UV-induced hydrophilic state depends on a dopant type. The maximum surface hydrophilicity is achieved upon UV irradiation of TiO2 doped with Nb regardless of its content. UV-irradiated Al-doped TiO2 coatings exhibit small contact angles, while the photoinduced surface hydrophilicity of Sc-doped titanium dioxide films decreases with increasing scandium concentration. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Colloid Journal is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1134/S1061933X24600544 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 23 StartPage: 757 Subjects: – SubjectFull: Electron work function Type: general – SubjectFull: Contact angle Type: general – SubjectFull: Substrates (Materials science) Type: general – SubjectFull: Acidity function Type: general – SubjectFull: Titanium dioxide Type: general Titles: – TitleFull: Photoinduced Superhydrophilicity of Titanium Dioxide: Effect of Heterovalent Doping with Metals. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rudakova, A. V. – PersonEntity: Name: NameFull: Bulanin, K. M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 1061933X Numbering: – Type: volume Value: 86 – Type: issue Value: 5 Titles: – TitleFull: Colloid Journal Type: main |
| ResultId | 1 |
