Optical and hydrophilic properties of Cr doped TiO2–SiO2 nanostructure thin film

Eshaghi, Akbar; Eshaghi, Ameneh

doi:10.1016/j.apsusc.2011.10.073

Cited by 30 publications

(9 citation statements)

References 19 publications

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“…Regarding the connection mode, each octahedron in the rutile phase is coupled with 10 adjacent octahedrons, while in the anatase phase, each octahedron is coupled with 8 adjacent octahedrons. These differences in the lattice structure result in different mass densities and electronic band structures of the two forms of TiO 2 [74]. The mass density of anatase TiO 2 is 3.894 g/cm 2 , which is slightly smaller than the value of 4.250 g/cm 2 for rutile.…”

Section: Molecular Dynamics Simulationmentioning

confidence: 89%

Theoretical calculation of a TiO₂-based photocatalyst in the field of water splitting: A review

Gao

2020

Nanotechnology Reviews

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Currently, energy and environmental problems are becoming more serious. The use of solar energy to split water and produce clean, renewable hydrogen as an energy source is a feasible and effective approach to solve these problems. As the most promising semiconductor material for photocatalytic water splitting, TiO2-based nanomaterials have received increasing attention from researchers in academia and industry in recent years. This review describes the research progress in the theoretical calculations of TiO2-based photocatalysts in water splitting. First, it briefly introduces some commonly used theoretical calculation methods, the crystal structure of TiO2 and its photocatalytic mechanism, and the principle of doping and heterojunction modification to improve the photocatalytic performance of TiO2. Subsequently, the adsorption state of water molecules with different coverages on the surface of TiO2, the rate-limiting steps of the splitting of water molecules on the surface of TiO2, and the transfer process of photogenerated current carriers at the interface between water molecules and TiO2 are analyzed. In addition, a brief review of research into the theoretical calculations of TiO2-based commercial photocatalysts in the field of water splitting is also provided. Finally, the calculation of TiO2-based photocatalytic water-splitting simulations is summarized, and possible future research and development directions are discussed.

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Section: Molecular Dynamics Simulationmentioning

confidence: 89%

Theoretical calculation of a TiO₂-based photocatalyst in the field of water splitting: A review

Gao

2020

Nanotechnology Reviews

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“…Hydrophilicity and photo-induced hydrophilicity are important factors affecting photocatalysis. It has been reported that Si doping is highly effective in the enhancement of hydrophilicity and photo-induced hydrophilicity and so the enhancement of photocatalysis (Eshaghi and Eshaghi 2012;Lu et al 2011;Eshaghi et al 2011);…”

Section: Introductionmentioning

confidence: 99%

“…To improve their photocatalysis and mineralization, many methods including various dopings were used to enlarge the wavelength range of absorbed light by narrowing the bandgap of TiO 2 (Lindgren et al 2003;Nishijima et al 2007;Umebayashi et al 2002;Ahmad et al 2013;Fa et al 2013). Constructing hybrid materials with other semiconductors has also been widely used in enhancing photocatalytic activity (Zhang et al 2012;György et al 2014;Wang et al 2013;Li et al 2012;Wang et al 2014;Park et al 2013;Eshaghi and Eshaghi 2012). Hydrophilicity and photo-induced hydrophilicity are important factors affecting photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Highly Active Si-doped TiO2 Nanotube/SnS Hybrids for Photocatalytic Degradation of Toxic Dyes

2021

Preprint

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Heterostructures with nanoscale sizes have great superiorities in photocatalytic environment decontaminant because of their efficient interface charge transfer and great surface area. This work reports the facile fabrication of nano-tubular TiO2 and Si-doped TiO2 (NTs) hybridizing SnS nanocrystallites and their high-efficient photocatalytic activity. The fabricated nanostructures show wide light absorption in the UV-visible region. The SBET, light absorption, hydrophilicity, and photo-induced super hydrophilicity were enhanced by Si-doping and SnS modification. Moreover, high-efficient interface charge transfer was produced after the SnS modification and further enhanced by the Si doping because of band structure modulation. Thus, the Si-doped TiO2 nanotubes/SnS heterostructures showed a remarkably enhanced photocatalytic and Fenton-like photocatalytic activities in dye wastewater treatment than the TiO2 NTs. This work suggests potential materials and their facile fabrication process for the photocatalytic application of environmental decontamination.

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“…Sol-gel technique offers many advantages over the other fabrication techniques, such as homogeneity, stoichiometric control of reagents, high degree of purity, ease of processing, controlling the material composition, and ability to coat large and complex area of substrate (Helmut, 1986). Controlling the valence and conduction band positions is important for designing pigments and such knowledge is also essential for exploring new photocatalysts (Dolgos et al, 2009;Peng et al, 2012;Eshaghi, 2012). Interestingly, Cr 1.3 Fe 0.7 O 3 is not only of interest as a pigment but also seems to be a highly efficient photovoltaic material.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterisation and optical band gap of Cr_1.3Fe_0.7O₃ nanopigments

Enhessari

2013

Pigment &Amp; Resin Technology

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Purpose -Inorganic pigments have been widely investigated due to their chemical stability such as resistance to chemical attacks by acids and alkalis, excellent hardness and high temperature stability. Cr 1.3 Fe 0.7 O 3 which is considered as a ceramic nanopigment also seems to be a highly efficient photovoltaic material. The paper aims to discuss these issues. Design/methodology/approach -In this work, the paper reports the synthesis of a novel and high purity Cr 1.3 Fe 0.7 O 3 nanopigment via sol-gel process using stearic acid as complexing agent. The method includes formation of an organic precursor with metallic cations homogeneously distributed all over the matrix. Sample characterisations were performed by X-ray diffraction, electron microscopy, UV-vis diffused reflectance spectra and photoluminescence. The transport properties and colour characteristics were also investigated by spectroscopic and technological characterisation of the synthesised nanoparticles. Findings -The prepared nanopigments were uniform in distribution and a spherical morphology with an average size of about 200 nm was observed. Cr 1.3 Fe 0.7 O 3 nanoparticles showed a direct band gap value of 2.85 eV and the colour efficiency of the nanopigments evaluated by colourimetric analysis resulted characteristic values of L * ¼ 39.96, a * ¼ 3.67 and b * ¼ 3.12. Originality/value -This method for synthesis of nanopigments is novel and could be employed for various applications in synthesis of wide variety of nanoceramics.

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Optical and hydrophilic properties of Cr doped TiO2–SiO2 nanostructure thin film

Cited by 30 publications

References 19 publications

Theoretical calculation of a TiO₂-based photocatalyst in the field of water splitting: A review

Theoretical calculation of a TiO₂-based photocatalyst in the field of water splitting: A review

Synthesis of Highly Active Si-doped TiO2 Nanotube/SnS Hybrids for Photocatalytic Degradation of Toxic Dyes

Synthesis, characterisation and optical band gap of Cr_1.3Fe_0.7O₃ nanopigments

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Optical and hydrophilic properties of Cr doped TiO2–SiO2 nanostructure thin film

Cited by 30 publications

References 19 publications

Theoretical calculation of a TiO2-based photocatalyst in the field of water splitting: A review

Theoretical calculation of a TiO2-based photocatalyst in the field of water splitting: A review

Synthesis of Highly Active Si-doped TiO2 Nanotube/SnS Hybrids for Photocatalytic Degradation of Toxic Dyes

Synthesis, characterisation and optical band gap of Cr1.3Fe0.7O3 nanopigments

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Theoretical calculation of a TiO₂-based photocatalyst in the field of water splitting: A review

Theoretical calculation of a TiO₂-based photocatalyst in the field of water splitting: A review

Synthesis, characterisation and optical band gap of Cr_1.3Fe_0.7O₃ nanopigments