Local Ordering at the Interface of the TiO2-WO3 Bi-Layers

Macovei, D.; Dăscăleanu, Vasile; Teodorescu, Cristian M.; Luca, D.

doi:10.1007/978-3-319-30198-3_10

Cited by 1 publication

(2 citation statements)

References 48 publications

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“…As for a potential co-doping of TNA through the incorporation of W landed atoms under cathode sputtering, at present we can only speculate, due to experimental difficulties in carrying out chemical depth profiling of nanotube walls. However, our previous results concerning the profile of the interface of the WO 3 -TiO 2 bi-layer films [38] evidenced a sharp interface, 25 nm thick, and no W atoms in the TiO 2 layer within the detection limits of the XPS instrument.…”

Section: Nanotube Crystallinity and Elemental Compositionmentioning

confidence: 70%

“…Despite being due to different mechanisms, the photocatalytic and hydrophilic characteristics of titania are closely correlated, following similar evolution under photo-activation and back-reaction conditions [37,38]. The UV irradiation induces surface oxygen vacancies at the bridging sections of TiO 2 , hence OH − species, able to facilitate almost full surface wetting [39].…”

Section: Photocatalytic Activity Camentioning

confidence: 98%

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Synthesis and optimization of photocatalytic performance of WO₃-loaded TiO₂nanotube array layers

Teodorescu-Soare¹,

Dobromir²,

Ciobanu³

et al. 2019

Semicond. Sci. Technol.

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TiO 2 nanotube arrays were grown by anodic oxidation of the surface of Ti metal foils in an electrochemical cell with organic electrolyte containing fluorine, using constant bias voltage, 30 V. The average typical diameter and length of the as-prepared tubes were 87 nm and 3.8 μm, respectively. The titania nanotube arrays surface was subsequently loaded with WO 3 noncontiguous thin layers by plasma-assisted RF sputtering. The addition of WO 3 on the nanotube surface resulted in the formation of semiconductor heterojunctions, which lead to supplementary spatial separation of electron-hole pairs and reduced the recombination rate. Macroscopically, this is certified by increased lifetime of the photocatalytic activation and associated increase of surface wettability. In the current experiments, four sample sets with increasing WO 3 coverage were prepared by increasing the sputter-deposition time of the WO 3 material. Nanotube array morphology, structure and elemental composition were investigated by high-resolution scanning electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, and energy-dispersive x-ray spectroscopy. A comparison was made between the characteristics of the WO 3 -loaded nanotube layers and a reference bare TiO 2 nanotube arrays layer. Annealing the samples at 420 °C led to the development of predominant anatase. The effects of UV irradiation and the presence of dopant fluorine species were further investigated and discussed as means to modifying the generation of hydroxyl radicals. Optimal conditions for the best photocatalytic performance of titania nanotube arrays were established via monitoring the degradation of methylene blue pollutant.

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Section: Nanotube Crystallinity and Elemental Compositionmentioning

confidence: 70%

Section: Photocatalytic Activity Camentioning

confidence: 98%

Synthesis and optimization of photocatalytic performance of WO₃-loaded TiO₂nanotube array layers

Teodorescu-Soare¹,

Dobromir²,

Ciobanu³

et al. 2019

Semicond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Local Ordering at the Interface of the TiO2-WO3 Bi-Layers

Cited by 1 publication

References 48 publications

Synthesis and optimization of photocatalytic performance of WO₃-loaded TiO₂nanotube array layers

Synthesis and optimization of photocatalytic performance of WO₃-loaded TiO₂nanotube array layers

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Local Ordering at the Interface of the TiO2-WO3 Bi-Layers

Cited by 1 publication

References 48 publications

Synthesis and optimization of photocatalytic performance of WO3-loaded TiO2nanotube array layers

Synthesis and optimization of photocatalytic performance of WO3-loaded TiO2nanotube array layers

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Synthesis and optimization of photocatalytic performance of WO₃-loaded TiO₂nanotube array layers

Synthesis and optimization of photocatalytic performance of WO₃-loaded TiO₂nanotube array layers