The optical absorption edge of brookite TiO2

Zallen, Richard; Moret, Mona P.

doi:10.1016/j.ssc.2005.10.024

Cited by 196 publications

(112 citation statements)

References 25 publications

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“…Zallen and Moret [26] reported that natural crystals of brookite had an indirect band gap of about 1.9 eV. This low value is ascribable to the presence of impurities in the mineral that was pale brown in color.…”

Section: Electronic Propertiesmentioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

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Abstract:Brookite is the least studied TiO 2 photocatalyst due to the difficulties usually encountered in order to obtain it as a pure phase. In this review, a comprehensive survey of the different methods available for preparing brookite powders and films is reported. Attention has been paid both to the most traditional methods, such as hydrothermal processes at high temperatures and pressures, and to environmentally benign syntheses using water soluble compounds and water as the solvent. Papers reporting the photocatalytic activity of pure and brookite-based samples have been reviewed.

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Section: Electronic Propertiesmentioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

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“…Refractive indices have been reported by Gehrsitz et al [33], Gini and Melchior [34], Chandra et al [35], and Henry et al [36], Lee and Lee [37] or found in www.virginiasemi.com. Temperature−dependent absorption coefficients have been given in [38][39][40][41][42][43][44][45]. Electrical and thermal parameters of structure layers at 300 K and, as an example, at 350 K are listed in Tables 1 and 3, respectively, optical ones -in Table 4, and model parameters necessary for gain calculations (found in Refs.…”

Section: Model Parametersmentioning

confidence: 99%

Investigation of temperature characteristics of modern InAsP/InGaAsP multi-quantum-well TJ-VCSELs for optical fibre communication

Piskorski¹,

Sarzała²,

Nakwaski³

2011

Opto-Electronics Review

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Continuous-wave (CW) performance of modern 1.3-μm InAsP/InGaAsP multi-quantum-well (MQW) tunnel-junction vertical-cavity surface-emitting diode lasers (TJ-VCSELs) is investigated using our comprehensive self-consistent simulation model to suggest their optimal design for room and elevated temperatures. For increasing ambient temperatures, an increase in the VCSEL threshold current has happened to be mostly associated with the Auger recombination. Nevertheless, the InAsP/InGaAsP VCSELs have been found to exhibit encouraging thermal behaviour with the quite high value of maximal operating temperature of 350 K. It has been found that 5-μm devices seem to be the most optimal ones because they demonstrate both the room temperature (RT) threshold current equal to only 0.55 mA and maximum operating temperature equal to as much as 345 K. For these devices, the characteristic temperature T0 is equal to 92 K for 290–305 K, 51 K for 310–325 K and 29 K for 330–345 K. Therefore, the InAsP/InGaAsP VCSELs have been found to offer very promising performance both at room and elevated temperatures as sources of the carrier 1.3-μm wave in the fibre optical communication using silica fibres.

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“…Electrical energy per order (E EO ) compares electrical efficiency of different UV-based AOPs and is a measure of the electrical efficiency of an AOP system. It is defined (for low concentration of pollutants) as the electrical energy in kilowatt hours (kWh) required bringing about the degradation of a contaminant by one order of magnitude in 1m 3 (1000 L) of contaminated water. Generally, the higher the energy efficiency of a process, the lower the E EO .…”

Section: Photocatalytic Activity Of the Synthesised Tio 2 Nanoparticlesmentioning

confidence: 99%

“…It has been used mostly as a pigment in paints, sunscreens, ointments and toothpaste since its commercial production in the early twentieth century. TiO 2 pigments are inorganic chemical products used for imparting whiteness, brightness and opacity to a diverse range of applications and end-use markets, including coatings, plastics, paper and other industrial and consumer products [2,3]. TiO 2 is obtained from a variety of ores that contain ilmenite, rutile, anatase and leucoxene, which are mined from deposits located throughout the world.…”

Section: Introductionmentioning

confidence: 99%