Optical studies on sol–gel derived titanium dioxide films

Ray, Asim K.; Tracey, S.M.; McQuillin, B; Hodgson, Simon

doi:10.1049/ip-smt:20000698

Cited by 12 publications

(10 citation statements)

References 17 publications

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“…This problem is not expected in high density, non-porous anatase titania thin films which may be incorporated in conductiometric gas sensing and photovoltaic devices. The estimated value of trap depth from the conductivity measurements agrees well with that for the density of state tails in the mobility band gap obtained from optical absorption measurements on the polycrystalline TiO 2 film [18]. It is also possible that there is a distribution of traps E t over a wide range of energy.…”

Section: Discussionsupporting

confidence: 79%

High density, non-porous anatase titania thin films for device applications

Fan

McQuillin

Ray

et al. 2000

J. Phys. D: Appl. Phys.

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TEM studies have been performed on 50 nm thick monolayer films of sol-gel derived anatase titania (TiO2). It is found that a dense polycrystalline structure, having low porosity and consisting of nanocrystallites ranging from 5-20 nm in diameter, is the result of a sintering process involving temperature ramping up to 550 °C. Ohmic conduction is believed to be due to almost flat band conditions caused by partial depletion of carriers from the crystallites.

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Section: Discussionsupporting

confidence: 79%

High density, non-porous anatase titania thin films for device applications

Fan

McQuillin

Ray

et al. 2000

J. Phys. D: Appl. Phys.

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“…These crystalline planes can be associated with the rutile phase (JCPDS #021-1276); this happens because the rutile phase is thermodynamically the most stable crystalline phase and it possesses the highest density with a compact atomic structure. The presence of Cu is a disadvantage for the formation of the metastable anatase phase and so the rutile growth can occur [20]. Furthermore, not a signal associated with CuO or compund of Cu is observed, indicating that the compound could be amorfous or that it could be incorporated in the crystalline network of the doped TiO 2 .…”

Section: A Diffuse Transmittance Measurementsmentioning

confidence: 99%

Synthesis and characterization of Tio2 thin films doped with copper to be used in photocatalysis

Díaz‐Uribe¹,

Vallejo²,

Ortega³

2013

Iteckne

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In this work we studied the influence of incorporation of copper into TiO 2 thin films on structural, optical and surface properties of TiO 2 thin films. The as-grown TiO 2 was synthesized by sol gel method using titanium isopropoxide, and the TiO 2 thin films were deposited by spin coating method. TiO 2 copper-doped (Cu:TiO 2) was synthesized by impregnation method using Cu(NO 3).H 2 O as source of Cu(II), the Cu:TiO 2 thin films were deposited by spin coating method. The properties of the compounds obtained were evaluated by measurements of x-ray diffraction (xRD) and diffuse reflectance. The xRD results showed that Cu doping change the crystalline phase radio of the films, xRD pattern of TiO 2 indicated that films grow with anatase structute, while Cu:TiO 2 thin films presented a polycrystalline mixture of anatase/rutile. Reflectance analysis indicated that TiO 2 presents an energy band gap of 3.25 eV and the Cu:TiO 2 presents a shift-red of the band gap to 2,9 eV. The results suggest that doping with copper improved the harvesting of the TiO 2 to visible radiation.

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“…Brookite phase is difficult to produce and hence is barely used in any application. Rutile phase is thermodynamically the most stable one and possesses the highest refractive index and the highest density with compact atomic structure [12]. Rutile phase of TiO 2 is largely employed as a pigment in the reflective coatings because of its effective light scattering properties.…”

Section: Introductionmentioning

confidence: 99%

UV-reflecting sintered nano-TiO₂ thin film on glass for anti-bird strike application

Dey

2020

Surface Engineering

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A nanocrystalline TiO 2 glass coating was developed by sintering sol-gel derived thin film at 450°C. FTIR spectroscopy confirmed the absence of hydroxide gel and unreacted precursor as well as the presence of TiO 2 . The crystalline phase was predominantly anatase as identified from the XRD measurement and the crystallite size obtained from Scherrer's equation was 166 nm. This was in good agreement with the TiO 2 nanoparticle size of 148 nm obtained from BET adsorption experiment. The approximate BET surface coverage was 10.38 m 2 g −1 and the total pore volume was 0.02 cc g −1 . Most importantly, the sintered TiO 2 coated quartz glass showed a significant increase of 27.8% in UV reflectance, as obtained from UV-vis measurement and subsequent Kubelka-Munk function. This result is particularly advantageous to prevent bird-strike against high-rise glass buildings and windows.

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Optical studies on sol–gel derived titanium dioxide films

Cited by 12 publications

References 17 publications

High density, non-porous anatase titania thin films for device applications

High density, non-porous anatase titania thin films for device applications

Synthesis and characterization of Tio2 thin films doped with copper to be used in photocatalysis

UV-reflecting sintered nano-TiO₂ thin film on glass for anti-bird strike application

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Optical studies on sol–gel derived titanium dioxide films

Cited by 12 publications

References 17 publications

High density, non-porous anatase titania thin films for device applications

High density, non-porous anatase titania thin films for device applications

Synthesis and characterization of Tio2 thin films doped with copper to be used in photocatalysis

UV-reflecting sintered nano-TiO2 thin film on glass for anti-bird strike application

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UV-reflecting sintered nano-TiO₂ thin film on glass for anti-bird strike application