Spray deposition and property analysis of anatase phase titania (TiO2) nanostructures

Raj, A. Moses Ezhil; Agnes, V.; Jothy, V. Bena; Ravidhas, C.; Wollschläger, J.; Suendorf, M.; Neumann, M.; Jayachandran, M.; Sanjeeviraja, C.

doi:10.1016/j.tsf.2010.07.073

Cited by 44 publications

(18 citation statements)

References 42 publications

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“…It allows determining the optical band gaps from the extrapolation of the linear range to the abscissa as illustrated in the upper left of Figure 4. Considering the indirect band gap nature of Anatase, an optical band gap energy around 3.55 eV was calculated for all materials, which is slightly blue shifted in comparison to bulk TiO 2 but in good agreement with the value reported for spray-deposited nano-sized titania 27 and can be attributed to quantum effects. The specific surface area (SSA) determined from BET measurements was used to calculate the particle equivalence diameters assuming spherical particles with the weighted mean density calculated from the bulk density of Anatase and Rutile by using the following equation:…”

Section: Resultssupporting

confidence: 85%

Impact of Ambient Pressure on Titania Nanoparticle Formation During Spray-Flame Synthesis

Hardt¹,

Wlokas²,

Schulz³

et al. 2015

j nanosci nanotechnol

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Nanocrystalline titania was synthesized via liquid-fed spray-flame synthesis in a hermetically closed system at various pressures. Titanium tetraisopropoxide dissolved in isopropanol was used as precursor. The size, crystal structure, degree of agglomeration, morphology and the band gap of the as-prepared particles were investigated ex situ by nitrogen adsorption, transmission electron microscopy, X-ray diffraction, and UV-VIS absorption spectroscopy. In comparison to synthesis at atmospheric pressure it was found that decreasing pressure has a significant influence on the particle size distribution leading to smaller particles with reduced geometric standard deviation while particle morphology and crystal structure are not affected. Computational fluid dynamics simulations support the experimental findings also indicating a significant decrease in particle size at reduced pressure. Although it is well known that decreasing pressure leads to smaller particle sizes, it is (to our knowledge) the first time that this relation was investigated for spray-flame synthesis.

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Section: Resultssupporting

confidence: 85%

Impact of Ambient Pressure on Titania Nanoparticle Formation During Spray-Flame Synthesis

Hardt¹,

Wlokas²,

Schulz³

et al. 2015

j nanosci nanotechnol

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“…The observed stress in the films is almost constant at ~0.4142 GPa (Table ) for both doped and undoped TiO 2 films. The observed values are much lower than that of the films developed by Raj et al (0.763 GPa).…”

Section: Resultscontrasting

confidence: 67%

Dye degradation studies of Mo‐doped TiO₂ thin films developed by reactive sputtering

Sreedhar

Brijitta

Reddy

et al. 2017

Surface & Interface Analysis

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TiO 2 thin films with various Mo concentrations have been deposited on glass and n-type silicon (100) substrates by this radio-frequency (RF) reactive magnetron sputtering at 400°C substrate temperature. The crystal structure, surface morphology, composition, and elemental oxidation states of the films have been analyzed by using X-ray diffraction, field emission scanning electron microscopy, atomic force microscopy, and X-ray photoelectron spectroscopy, respectively. Ultraviolet-visible spectroscopy has been used to investigate the degradation, transmittance, and absorption properties of doped and undoped TiO 2 films. The photocatalytic degradation activity of the films was evaluated by using methylene blue under a light intensity of 100 mW cm −2 . The X-ray diffraction patterns show the presence of anatase phase of TiO 2 in the developed films. Xray photoelectron spectroscopy studies have confirmed that Mo is present only as Mo 6+ ions in all films. The Mo/TiO 2 band gap decreases from~3.3 to 3.1 eV with increasing Mo dopant concentrations. Dye degradation of~60% is observed in Mo/TiO 2 samples, which is much higher than that of pure TiO 2 .

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“…[175] However, with respect to fabrication of hybrid solar cells or respective (metal oxide) photoanodes, it was only rarely applied so far. [176][177][178] For example Song et al used spray coating to fabricate mesoporous titania films. [177] Pre-synthesized crystalline titania nanoparticles with a size of ≈4.5 nm [179,180] were introduced into the block copolymer assisted sol-gel synthesis of the metal oxide phase of the hybrid films in order to obtain more efficient titania photoanodes.…”

Section: Morphology Control Using Insulating Block Copolymersmentioning

confidence: 99%

Hybrid Photovoltaics – from Fundamentals towards Application

Müller‐Buschbaum

Thelakkat

Fässler

et al. 2017

Advanced Energy Materials

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In hybrid photovoltaics, an organic and an inorganic semiconductor are combined in the active layer, with the advantages of both material classes in a single device. The organic component contributes towards the possibility for wet chemical device preparation with potentially low costs in combination with achieving flexible devices. From the inorganic component an increase in stability, as well as superior opto‐electronic properties, is added. Given the large diversity of organic and inorganic semiconductors, a large number of possible realizations of hybrid solar cells emerge. In the present review, we limit to hybrid solar cells which combine conjugated polymers with inorganic materials such as titanium dioxide, zinc oxide, silicon, germanium and quantum dots to keep focused. Particular emphasis is put on different routes to tailor nanostructures, such as the use of semiconductor block copolymers. The inorganic component is either synthesized directly in one of the blocks or added as a pre‐synthesized nanomaterial to form the hybrid material. Alternatively, the block copolymer is used as a structure‐directing template in a sol–gel synthesis approach to have tailored inorganic nanostructures, which are back‐filled with the organic component to fabricate the hybrid material. Hybrid solar cells based on crystalline Si are discussed for comparison.

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Spray deposition and property analysis of anatase phase titania (TiO2) nanostructures

Cited by 44 publications

References 42 publications

Impact of Ambient Pressure on Titania Nanoparticle Formation During Spray-Flame Synthesis

Impact of Ambient Pressure on Titania Nanoparticle Formation During Spray-Flame Synthesis

Dye degradation studies of Mo‐doped TiO₂ thin films developed by reactive sputtering

Hybrid Photovoltaics – from Fundamentals towards Application

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Spray deposition and property analysis of anatase phase titania (TiO2) nanostructures

Cited by 44 publications

References 42 publications

Impact of Ambient Pressure on Titania Nanoparticle Formation During Spray-Flame Synthesis

Impact of Ambient Pressure on Titania Nanoparticle Formation During Spray-Flame Synthesis

Dye degradation studies of Mo‐doped TiO2 thin films developed by reactive sputtering

Hybrid Photovoltaics – from Fundamentals towards Application

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Dye degradation studies of Mo‐doped TiO₂ thin films developed by reactive sputtering