Photoinduced effects in TiO2 nanocrystalline films with different morphology

Djaoued, Yahia; Ozga, K.; Wojciechowski, A.; Reshak, A.H.; Robichaud, Jacques; Kityk, I.V.

doi:10.1016/j.jallcom.2010.08.135

Cited by 37 publications

(13 citation statements)

References 27 publications

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“…So one can assume that in the presented here layers, which are annealed at temperature 500°C there is present only anatase [3]. Rutyl appears in the layers of TiO 2 which are thermoannelaed at temperatures higher 600°C [17,27,28].…”

Section: Optical Featuresmentioning

confidence: 77%

“…It is of interest for use as gas sensor [1, 2], photoinduced optical operated materials [3], solar cell [4][5][6], photocatalyst [7][8][9], selfcleaning glasses [10], electrochromic films [11], antireflection coatings [12] and transparent conductors [13]. Titanium dioxide is also a principal component used in planar waveguide technology [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Nano-sized blue spectral shift in sol–gel derived mesoporous titania films

Karasiński

Gondek

Drewniak

et al. 2011

J Sol-Gel Sci Technol

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Following the spectral energy shift of the energy gap (blue shift) of the TiO 2 sol-gel derived films we have evaluated diameters of the nanocrystallites. The TiO 2 films were deposited by dip-coating technique. Two types of mesoporous films were studied: films with porosity *16% and refractive index (2.15 at wavelength 633 nm) and films with porosity *46% and refractive index (1.61 at wavelength 633 nm). High porosity and consequently low refractive index was achieved by adding the non-ionic surfactant Triton X-100 to the starting solution as template. The principal goal of the work is to establish the influence of the Triton X-100 on the morphology as well as to establish a possible correlation between the morphology and optical features of the titania films. The surface morphology was explored using AFM method. And the energy gap was determined from the transmission spectra. Analysis of the blue energy spectral shift is performed following the excitonic model.

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Section: Optical Featuresmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Nano-sized blue spectral shift in sol–gel derived mesoporous titania films

Karasiński

Gondek

Drewniak

et al. 2011

J Sol-Gel Sci Technol

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“…As catalyst and catalyst supports, ZrTiO 4 is employed for a wide variety of catalytic applications both in liquid and gaseous phases [18,19]. Recently it has been reported that the oxide nanoparticles are promising for photonics, and their monodispersion and appropriate contact with the surrounding medium are very crucial parameters [20,21].…”

Section: Journal Of Nanoparticlesmentioning

confidence: 99%

Microwave-Assisted Synthesis of Mixed Metal-Oxide Nanoparticles

Verma

Dwivedi

Prasad

et al. 2013

Journal of Nanoparticles

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Nanoparticles of mixed metal oxides, ZrO2, ZrTiO4, and ZrV2O7 were prepared by microwave-assisted citrate sol-gel and solution combustion method. The prepared nanoparticles were characterized for their structural details using XRD and TEM techniques. The broadening of Raman bands is ascribed to local compositional fluctuations or local positional disordering produced due to random distribution of Zr4+ and Ti4+between equivalent sites. The XPS spectra confirm the incorporation of Ti in ZrO2 and suggest Zr as well as Ti in +4 oxidation state. Gelation and fast combustion seem to be the reason for smaller particle sizes. ZrV2O7 nanocrystalline material was synthesized by microwave- assisted solution combustion method. Low angle powder XRD measurements confirm the mesoporous nature of the prepared material. The effect of calcination temperature on the phase transformation of the materials has been investigated. Among tetragonal, monoclinic, and cubic phases, the monoclinic phase is predominant at higher calcinations temperature. The XPS confirms the incorporation of V2O5 in ZrO2 and suggests that Zr and V are in the same oxidation state (+4). The average particle sizes for ZrO2, ZrTiO4, and ZrV2O7 were found to be in the ranges of 5–10 nm, 2–5 nm, and 10–50 nm, respectively.

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“…Satyanarayana et al studied the role of valence states in optical and electronic features of PbOeSb 2 O 3 eB 2 O 3 :TiO 2 glass alloys [40]. In addition, photoinduced absorption was studied in TiO 2 nanocrystalline films prepared by dip-coating [41]. Furthermore, Reshak et al performed ab-initio calculations to obtain a comprehensive theoretical study of the electronic band structure and optical properties of titanium oxyphosphates single crystals [42,43].…”

Section: Introductionmentioning

confidence: 99%