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Light-controlled two-dimensional TiO₂ plate micromotors.

ABSTRACT: In this work, UV light-controlled two-dimensional (2D) TiO₂ plate micromotors are demonstrated for the first time. The 2D TiO₂ micromotors are produced by the well-known anodic oxidation method in combination with a cracking and separation process. When the motor is placed in H₂O₂ aqueous solution under UV irradiation, oxygen bubbles are generated in the holes of the TiO₂ membrane. The 2D micromotor thus moves upon O₂ bubbles under its own weight. In contrast to bubble-propelled micromotors, which require an addition of surfactants to chemical fuels, the 2D micromotor is capable of moving in aqueous H₂O₂ solution without surfactants. Moreover, speed of the 2D TiO₂ micromotor can be controlled by the intensity of the UV light. Such surfactant-free micromotors and their facile fabrication hold considerable promise for diverse practical applications in the biomedical and energy fields, for example, and in new materials.

SUBMITTER: Wang Y

PROVIDER: S-EPMC9071806 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Light-controlled two-dimensional TiO2 plate micromotors.

Wang Ying Y Li Zhen Z Solovev Alexander A AA Huang Gaoshan G Mei Yongfeng Y

RSC advances 20190917 50

In this work, UV light-controlled two-dimensional (2D) TiO2 plate micromotors are demonstrated for the first time. The 2D TiO2 micromotors are produced by the well-known anodic oxidation method in combination with a cracking and separation process. When the motor is placed in H2O2 aqueous solution under UV irradiation, oxygen bubbles are generated in the holes of the TiO2 membrane. The 2D micromotor thus moves upon O2 bubbles unde ...[more]

PMID: 35528446

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Project description:This paper reports the synthesis of two-dimensional, hierarchical, porous, and (001)-faceted metal (Ag, Zn, and Al)-doped TiO2 nanostructures (TNSs) and the study of their photocatalytic activity. Two-dimensional metal-doped TNSs were synthesized using the hydrolysis of ammonium hexafluorotitanate in the presence of hexamethylenetetramine and metal precursors. Typical morphology of metal-doped TNSs is a hierarchical nanosheet that is composed of randomly stacked nanocubes (dimensions of up to 5 μm and 200 nm in edge length and thickness, respectively) and has dominant (001) facets exposed. Raman analysis and X-ray photoelectron spectroscopy results indicated that the Ag doping, compared to Zn and Al, much improves the crystallinity degree and at the same time dramatically lowers the valence state binding energy of the TNS and provides an additional dopant oxidation state into the system for an enhanced electron-transfer process and surface reaction. These are assumed to enhance the photocatalytic of the TNS. In a model of photocatalytic reaction, that is, rhodamine B degradation, the AgTNS demonstrates a high photocatalytic activity by converting approximately 91% of rhodamine B within only 120 min, equivalent to a rate constant of 0.018 m-1 and ToN and ToF of 94 and 1.57 min-1, respectively, or 91.1 mmol mg-1 W-1 degradation when normalized to used light source intensity, which is approximately 2 times higher than the pristine TNS and several order higher when compared to Zn- and Al-doped TNSs. Improvement of the crystallinity degree, decrease in the defect density and the photogenerated electron and hole recombination, and increase of the oxygen vacancy in the AgTNS are found to be the key factors for the enhancement of the photocatalytic properties. This work provides a straightforward strategy for the preparation of high-energy (001) faceted, two-dimensional, hierarchical, and porous Ag-doped TNSs for potential use in photocatalysis and photoelectrochemical application.

Dataset Information

Light-controlled two-dimensional TiO₂ plate micromotors.

Publications

Light-controlled two-dimensional TiO<sub>2</sub> plate micromotors.

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