Decoration of the TiO2 nanotube arays with copper suboxide by AC treatment

Jagminas, Arūnas; Kovger, Jelena; Rėza, A.; Niaura, Gediminas; Juodkazytė, Jurga; Selskis, A.; Kondrotas, Rokas; Šebeka, Benjaminas; Vaičiūnienė, Jūratė

doi:10.1016/j.electacta.2014.01.146

Cited by 11 publications

(7 citation statements)

References 53 publications

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“…It is well known that nanocrystalline and nanotubular TiO 2 structures decorated with visible light absorbers, such as dye molecules [1], QDs of precious metals [2][3][4], and semiconducting species of metal oxides, sulfides, etc. [5][6][7][8][9][10], can absorb a visible light. In the past decade, this effect has been intensively investigated, leading to numerous suggestions regarding doping and decoration of various TiO 2 -based structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen doping on the loading of titania nanotube films with copper selenide species via alternating current deposition

et al. 2015

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Fabrication of TiO 2 nanotube (TiNT) films nicely decorated with lower band gap semiconducting nanoparticles remains a challenging issue for photocatalytic and solar cell applications active under visible light irradiation. In this study, TiNT films were decorated with copper selenide species via alternating current deposition method. For the first time, to achieve uniform loading of copper selenide species inside the TiNT film, as-grown and calcined TiNT films before depositions were subjected to hydrogen doping in various solutions under DC and AC pretreatments as well as by treating TiNT in H 2 atmosphere. Different pretreatments resulted in different architectures of Cu x Se-in-TiNT formed by subsequent AC deposition from the acidic Cu(II)-H 2 SeO 3 solution allowing predictable to encase Cu 2 Se 3 , Cu 2 Se, CuSe, or Cu 2-x Se species in nm-scaled size. Field-emission scanning electron microscopy with EDS and X-ray mapping, low-angle X-ray diffraction, and diffuse reflectance spectroscopy were applied to characterize the morphology, composition, uniformity of loading, and optical properties of the fabricated heterostructures. Except light absorption, characteristic for anatase TiO 2 , the additional absorption edge in the visible region is formed in the TiNT films decorated with copper selenide.

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Section: Introductionmentioning

confidence: 99%

Effect of hydrogen doping on the loading of titania nanotube films with copper selenide species via alternating current deposition

et al. 2015

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“…These two nanoparticles were combined to form the TiO 2 /Cu hybrid in an aqueous solution due to the opposing surface charge. The combination process is not complicated and can be upscaled for mass production (Deng et al 2014b, Jagminas et al 2014. Therefore, the TiO 2 /Cu hybrid exhibited good photocatalytic performance due to the interparticle charge transfer between the two nanoparticles (Nurdin 2014).…”

Section: Tio 2 /Cu Hybrid Photocatalytic Systemmentioning

confidence: 99%

TiO2 hybrid photocatalytic systems: impact of adsorption and photocatalytic performance

Amir

Julkapli

Yousefi³

2015

Reviews in Inorganic Chemistry

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AbstractFor the past 40 years, titanium dioxide (TiO2) nanomaterials have attracted immense attention because of their potential applications in the photodegradation of organic pollutants, photocatalytic water splitting for H2 generation, and dye-sensitized solar cells. Despite the fact that the potential applications of TiO2 nanoparticles are ubiquitous, they are not problem free, examples include a large interfacial area that causes slow charge carrier transport, a wide optical band gap that leads to limited applications using solar light, and single-phase and nanoscales features that induce fast recombination of photo-reduced carriers. Therefore, this review highlights the development associated with the adsorption photocatalysis hybrid system for treating wastewater. The immobilization of TiO2 photocatalysts in metal oxide, carbon, and ceramic materials to form TiO2 hybrid systems could prevent the problem of particle recovery, adsorption capacity, and the separation process. Such hybrid systems require significant effort of optimizing the specific surface area-to-volume ratio of the supported photocatalysts with its photocatalytic activities.

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“…Figure 5A compares the Raman spectra of the TiNT film before and after deposition of copper containing species. Strong Raman bands at 147, 397, 518, and 637 cm -1 are characteristic of crystalline anatase TiO 2 structure [30,31] whereas difference spectrum (c) clearly shows several peaks associated with copper oxygenous compounds. In brief, bands at 219, 533, and 625 cm -1 evidence the presence of Cu 2 O [32][33][34].…”

Section: Composition and Structure Of Heterostructured Filmsmentioning

confidence: 99%

Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu₂O-TiO₂ Heterostructures

Žalnėravičius

Paškevičius

Kovger

et al. 2014

Nanomaterials and Nanotechnology

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Nanoparticulate surfaces possessing antimicrobial and fungicidal properties under visible light illumination have found wide applications in a number of fields. In this study, titania nanotubes, as well as titania compact films were designed with pure Cu 2 O crystals in a mildly acidic copper acetate solution using a simple alternating current (AC) deposition approach. In this way, the thermally oxidized Ti substrate was coated by densely packed pyramidal and bipyramidal shaped Cu 2 O crystals with dominant (111) planes and investigated against several types of fungi and bacteria. For comparison, TiO 2 nanotube (TiNT) films were also decorated with similar crystals and tested. The results showed that, compared to bare TiO 2 films, both Cu 2 O-inTiNT and Cu 2 O-on-TiO 2 heterostructures exhibited remarkably enhanced activity against tested fungi and bacteria. We also demonstrated that the high photoactivity of these crystals remained even after 50 h stability tests under bright light illumination. The results obtained from in vitro tests indicated that Cu 2 O-in/on-TiO 2 heterostructures show promise as visible light driven antimicrobial materials.

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Decoration of the TiO2 nanotube arays with copper suboxide by AC treatment

Cited by 11 publications

References 53 publications

Effect of hydrogen doping on the loading of titania nanotube films with copper selenide species via alternating current deposition

Effect of hydrogen doping on the loading of titania nanotube films with copper selenide species via alternating current deposition

TiO2 hybrid photocatalytic systems: impact of adsorption and photocatalytic performance

Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu₂O-TiO₂ Heterostructures

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Decoration of the TiO2 nanotube arays with copper suboxide by AC treatment

Cited by 11 publications

References 53 publications

Effect of hydrogen doping on the loading of titania nanotube films with copper selenide species via alternating current deposition

Effect of hydrogen doping on the loading of titania nanotube films with copper selenide species via alternating current deposition

TiO2 hybrid photocatalytic systems: impact of adsorption and photocatalytic performance

Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu2O-TiO2 Heterostructures

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Fabrication by AC Deposition and Antimicrobial Properties of Pyramidal-Shaped Cu₂O-TiO₂ Heterostructures