Enhancement of photocatalytic pollutant decomposition efficiency of surface mounted TiO2 via lithographic surface patterning

Sidaraviciute, Ruta; Kavaliūnas, Vytautas; Puodžiukynas, Linas; Guobienė, Asta; Martuzevičius, Dainius; Andrulevičius, Mindaugas

doi:10.1016/j.eti.2020.100983

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…Moreover, active investigations are related to the photocatalytic activity of TiO 2 -based materials, including nanopowders and thin films. Due to chemical stability, non-toxicity, low cost, and high availability, titanium dioxide is considered the most promising photocatalyst for the degradation of organic pollutants in water and air, as well as for water splitting and hydrogen production [1][2][3]7,8,[13][14][15][16][17][18][19]. However, TiO 2 is a wide bandgap semiconductor (3.2 and 3.02 eV for the anatase and rutile phases, respectively [20]) that requires UV light (5% in the solar spectrum) for its activation.…”

Section: Introductionmentioning

confidence: 99%

Extraction–Pyrolytic Method for TiO2 Polymorphs Production

et al. 2021

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The unique properties and numerous applications of nanocrystalline titanium dioxide (TiO2) are stimulating research on improving the existing and developing new titanium dioxide synthesis methods. In this work, we demonstrate for the first time the possibilities of the extraction–pyrolytic method (EPM) for the production of nanocrystalline TiO2 powders. A titanium-containing precursor (extract) was prepared by liquid–liquid extraction using valeric acid C4H9COOH without diluent as an extractant. Simultaneous thermogravimetric analysis and differential scanning calorimetry (TGA–DSC), as well as the Fourier-transform infrared (FTIR) spectroscopy were used to determine the temperature conditions to fabricate TiO2 powders free of organic impurities. The produced materials were also characterized by X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM). The results showed the possibility of the fabrication of storage-stable liquid titanium (IV)-containing precursor, which provided nanocrystalline TiO2 powders. It was established that the EPM permits the production of both monophase (anatase polymorph or rutile polymorph) and biphase (mixed anatase–rutile polymorphs), impurity-free nanocrystalline TiO2 powders. For comparison, TiO2 powders were also produced by the precipitation method. The results presented in this study could serve as a solid basis for further developing the EPM for the cheap and simple production of nanocrystalline TiO2-based materials in the form of doped nanocrystalline powders, thin films, and composite materials.

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Section: Introductionmentioning

confidence: 99%

Extraction–Pyrolytic Method for TiO2 Polymorphs Production

et al. 2021

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“…Photocatalysts play a crucial role in photocatalytic hydrolysis of hydrogen production and carbon dioxide reduction. [8][9][10] Conventional photocatalysts, such as TiO 2 , [11][12][13][14][15] g-C 3 N 4 [16][17][18] and other photocatalysts, exhibit low conversion efficiency due to rapid charge recombination. [19][20] Therefore, it is necessary to find a co-catalyst to inhibit charge recombination and enhance separation ability.…”

Section: Introduction *mentioning

confidence: 99%

Progress in photocatalysis of new two-dimensional layered materials Mxenes

Kai¹,

ZHANG²,

KONG³

et al. 2021

Rev.Roum.Chim.

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As an extremely promising new class of materials, MXenes (two-dimensional layered materials) have attracted much interest and become a research hotspot in many fields. Owing to the typical layered structure, excellent electronic performance, it can be used as co-catalysts to recombine other photocatalytic materials to enhance the separation of photo-generated charges, inhibit the rapid recombination of charges, and finally convert solar energy into chemical energy. MXenes, which exhibit extraordinary catalytic activity in photocatalytic reactions, are increasingly being widely used as co-catalysts. This article summarizes and discusses two photocatalytic reactions with MXenes as co-catalysts, the dehydrogenation reaction (HER) and the CO2 reduction reaction (CO2RR), as well as their physical and chemical properties, preparation and synthesis methods, and the latest research progress. Summarized related applications and photocatalysis principles. Finally, the prospects and expectations of MXenes in photocatalytic applications are presented.

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“…In the TiO 2 solar-cell HEs, the TiO 2 acts as a hole blocker, which increases their efficiency. In addition to that, much research has been carried out over the past few decades, which focused on TiO 2 modification: metal doping of TiO 2 , [7][8][9][10][11] surface area modification, [12][13][14][15][16][17] and application of high-quality crystal phases or their mixtures. [18][19][20][21][22][23][24][25][26] Furthermore, various deposition methods have been extensively analyzed and compared through decades of research, based on photocatalysis efficiency.…”

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confidence: 99%

Conduction Band Discontinuity in n-type Si/TiO₂ Heterojunction Interfaces

Kavaliūnas

Hatanaka

Neo

et al. 2021

ECS J. Solid State Sci. Technol.

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The conduction band discontinuity between n-type Si substrates and anatase TiO2 films has been investigated. n-type Si substrates with three different dopant concentrations were used as a substrate for TiO2 thin-films: ND = 1015–16 cm−3 (as n-Si); ND = 1017–18 cm−3 (as n+-Si); ND = 1020–21 cm−3 (as n++-Si). The translation of X-ray photoelectron spectroscopy (XPS) results to an energy band diagram through the valence band offset (VBO) enables us to evaluate the conduction band discontinuities accurately: n-Si/TiO2—−0.22 eV, n+-Si/TiO2—−0.06 eV, and n++-Si/TiO2—+0.07 eV. Temperature–dependent current–voltage (I–V) characteristics were measured to evaluate the Fermi energy level (EF) of the TiO2 thin-films. Light transmittance was measured to evaluate the energy bandgap of the TiO2 thin-films. The band diagram of the n-type Si/TiO2 heterojunction was proposed. Deep-insight analysis of n-type Si/TiO2 was carried out on the basis of measured I–V characteristics.

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Enhancement of photocatalytic pollutant decomposition efficiency of surface mounted TiO2 via lithographic surface patterning

Cited by 9 publications

References 34 publications

Extraction–Pyrolytic Method for TiO2 Polymorphs Production

Extraction–Pyrolytic Method for TiO2 Polymorphs Production

Progress in photocatalysis of new two-dimensional layered materials Mxenes

Conduction Band Discontinuity in n-type Si/TiO₂ Heterojunction Interfaces

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Enhancement of photocatalytic pollutant decomposition efficiency of surface mounted TiO2 via lithographic surface patterning

Cited by 9 publications

References 34 publications

Extraction–Pyrolytic Method for TiO2 Polymorphs Production

Extraction–Pyrolytic Method for TiO2 Polymorphs Production

Progress in photocatalysis of new two-dimensional layered materials Mxenes

Conduction Band Discontinuity in n-type Si/TiO2 Heterojunction Interfaces

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Conduction Band Discontinuity in n-type Si/TiO₂ Heterojunction Interfaces