High-performance photodetectors and enhanced photocatalysts of two-dimensional TiO<sub>2</sub>nanosheets under UV light excitation

Yang, Jing; Jiang, Yilin; Li, Lin-Jie; Muhire, Elisée; Gao, Meizhen

doi:10.1039/c5nr09248e

Cited by 70 publications

(22 citation statements)

References 39 publications

(43 reference statements)

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“…These peaks represent the binding energy of Ti 2p 3/2 and Ti 2p 1/2 , which indicates that Ti is in the +4 valence state in the sample. The spacing between the two peaks of 5.7 eV is also consistent with the +4 oxidation state [32]. Figure 5d shows the high-resolution spectrum of Ag.…”

Section: Resultssupporting

confidence: 65%

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

Xu¹,

Liu²,

Zhao³

2020

Beilstein J. Nanotechnol.

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Plasmonic metal/semiconductor composites have attracted great attention for efficient solar energy harvesting in photovoltaic and photocatalytic applications owing to their extremely high visible-light absorption and tuned effective band gap. In this work, Ag-loaded TiO2 nanocolumn (Ag-TNC) arrays were fabricated based on anodic aluminum oxide (AAO) template by combining atomic layer deposition (ALD) and vacuum evaporation. The effects of the Ag loading position and deposition thickness, and the morphology, structure and composition of Ag-deposited TNC arrays on its optical and photocatalytic properties were studied. The Ag-filled TiO2 (AFT) nanocolumn arrays exhibited higher removal efficiency of methylene blue (MB) compared with Ag-coated TiO2 (ACT) nanocolumn arrays and pure TiO2 nanocolumns arrays. Both experimental and theoretical simulation results demonstrated that the enhanced photocatalytic performance of AFT nanocolumn arrays was attributed to the surface plasmon resonance (SPR) of Ag and the absorption of light by TiO2. These results represent a promising step forward to the development of high-performance photocatalysts for energy conversion and storage.

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Section: Resultssupporting

confidence: 65%

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

Xu¹,

Liu²,

Zhao³

2020

Beilstein J. Nanotechnol.

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show abstract

“…These peaks represent the binding energy of Ti 2p3/2 and Ti 2p1/2, which indicates that Ti is in the +4 valence state in the sample. The spacing between the two peaks of 5.7 eV is also consistent with the +4 oxidation state [29]. Fig.…”

Section: Characterizationsupporting

confidence: 75%

Effect of Ag Loading Location on the Photocatalytic Performance of a TiO₂ Nanocolumn Array

Xu¹,

Zhao²,

Liu³

2019

Preprint

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The evaluation of the photocatalytic performance of Ag-loaded TiO2 nanocolumn (Ag-TNC) arrays prepared by atomic layer deposition (ALD) and vacuum evaporation is described. The effects of Ag loading position and deposition thickness on the morphology, structure, composition, and optical and photocatalytic properties of the Ag-TNC arrays were studied by controlling the preparation process and vacuum evaporation time. The Ag-filled samples were found to maintain high catalytic efficiency, whereas that of the Ag-coated samples decreased with the increase of Ag deposition thickness. The reasons for the influence of the loading position on the catalytic efficiency are discussed, and the conclusions were verified by simulation.

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“…Constructing ultrathin 2D metal oxides has been regarded as an effective approach to optimize the specific surface area, charge migration, and thus achieve an efficient photocatalytic behavior. Up to now, several metal oxides with ultrathin 2D structures have been controlled prepared and applied to photocatalysis applications, such as TiO 2 , ZnO, WO 3 , Fe 2 O 3 , Cu 2 O, SnO, CeO 2 , In 2 O 3 , HNb 3 O 8 , and so on . Since the intrinsic nonlayered structured feature, some ultrathin 2D metal oxides are difficult to be synthesized via the simply direct ultrasonic exfoliation method from these bulk counterparts.…”

Section: D Photocatalystsmentioning

confidence: 99%

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

et al. 2017

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a great deal of research interest for diverse applications such as field effect transistors, optoelectronic devices, catalysis, energy storage, and conversion. [1][2][3][4][5] Benefiting from the features of atomic thickness, large specific surface area, intrinsic quantum confined electrons, and high ratio of surface atoms to entire atoms, the ultrathin 2D materials exhibit unique physicochemical properties, such as planar conductivity, electronic anisotropy, tunable energy band structure, and high surface activity. [6,7] When the thickness of bulk materials is reduced to the atomic level, the local atomic structures will suffer from obvious distinctions including coordination number, bond angle, bond length, and disorder degree of the surface atoms and may even result in the formation of numerous surface defects. As a consequence, the ultrathin 2D materials can not only display improved inherent properties of the bulk materials but also give birth to new properties that the corresponding bulk materials do not possess. [8,9] Semiconductor photocatalysis has attracted massive research interest since it has been regarded as one of the most promising solutions to deal with the energy shortage and environmental-pollution issues. [10][11][12][13][14] With the solar light as the external driving force, the semiconductor could split water into hydrogen and oxygen, reduce the CO 2 to chemicals and valuable fuel, as well as completely eliminate pollutants. [15][16][17][18] Generally, the major critical steps in the photocatalytic process can be classified as light absorption, charge separation and migration, as well as surface redox reactions. Under the irradiation, the photocatalysts can absorb the solar light and are excited to produce electron-hole pairs when the photon energy equal to or higher the bandgap, leaving the electrons in the conduction band (CB) and holes in the valence band (VB), respectively. Subsequently, the photogenerated electrons and holes will diffuse to the materials surface and further migrate to the surface active sites before involving in the surface reactions. During this process, the recombination of charge carriers will happen and the crystal structure, crystallinity, particle size, surface atomic structure, etc., will strongly affect the separation efficiency. Finally, the target molecule will be adsorbed on the materials surface, and will undergo charge injection process and desorption to form the ultimate products. [19] Up to now, hundreds of semiconductor materials are available for different photocatalytic applications with the help As a sustainable technology, semiconductor photocatalysis has attracted considerable interest in the past several decades owing to the potential to relieve or resolve energy and environmental-pollution issues. By virtue of their unique structural and electronic properties, emerging ultrathin 2D materials with appropriate band structure show enormous potential to achieve efficient photocatalytic performance. Here, the state-of-the-art progress on ultrathin 2D...

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High-performance photodetectors and enhanced photocatalysts of two-dimensional TiO₂nanosheets under UV light excitation

Cited by 70 publications

References 39 publications

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

Effect of Ag Loading Location on the Photocatalytic Performance of a TiO₂ Nanocolumn Array

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

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High-performance photodetectors and enhanced photocatalysts of two-dimensional TiO2nanosheets under UV light excitation

Cited by 70 publications

References 39 publications

Effect of Ag loading position on the photocatalytic performance of TiO2 nanocolumn arrays

Effect of Ag loading position on the photocatalytic performance of TiO2 nanocolumn arrays

Effect of Ag Loading Location on the Photocatalytic Performance of a TiO2 Nanocolumn Array

Ultrathin 2D Photocatalysts: Electronic‐Structure Tailoring, Hybridization, and Applications

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High-performance photodetectors and enhanced photocatalysts of two-dimensional TiO₂nanosheets under UV light excitation

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

Effect of Ag loading position on the photocatalytic performance of TiO₂ nanocolumn arrays

Effect of Ag Loading Location on the Photocatalytic Performance of a TiO₂ Nanocolumn Array