Preparation of strain-included rutile titanium oxide thin films and influence of the strain upon optical properties

Nambara, T.; Yoshida, Kenta; Liu, Miao; Tanemura, Sakae; Tanaka, Nobuo

doi:10.1016/j.tsf.2006.09.004

Cited by 19 publications

(4 citation statements)

References 32 publications

(30 reference statements)

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“…4(b). The values of E g for the anatase TiO 2 films and rutile films are 3.28 eV and 3.12 eV, which are close to the values reported by others [16][17][18]. Fig.…”

Section: Resultssupporting

confidence: 88%

Third-order optical nonlinearities in anatase and rutile TiO2 thin films

et al. 2009

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“…4(b). The values of E g for the anatase TiO 2 films and rutile films are 3.28 eV and 3.12 eV, which are close to the values reported by others [16][17][18]. Fig.…”

Section: Resultssupporting

confidence: 88%

Third-order optical nonlinearities in anatase and rutile TiO2 thin films

et al. 2009

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“…Since both samples are anatase and there is no blue shift in the UV-visible absorption spectra, the difference in photocatalytic activity shown in Figure 5 must be due to the difference in specific surface area. The quantum size effect of TiO 2 nanocrystals is normally revealed as a blue shift of the absorption edge in the UV-visible absorption spectra for nanocrystal sizes less than 5 nm (Nambara et al, 2007). The crystal sizes of the present titania samples are sufficiently large that no blue shift was observed in the UV-visible absorption spectra, so that quantum size effects can be discarded.…”

Section: Resultsmentioning

confidence: 99%

Specific Surface Area and Three-Dimensional Nanostructure Measurements of Porous Titania Photocatalysts by Electron Tomography and Their Relation to Photocatalytic Activity

Yoshida¹,

Makihara²,

Tanaka³

et al. 2011

Microsc Microanal

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Various porous titania photocatalysts are analyzed three-dimensionally in real space by electron tomography. Shapes and three-dimensional (3D) distributions of fine pores and silver (Ag) particles (2 nm in diameter) within the pores are successfully reconstructed from the 3D data. Electron tomography is applied for measuring the specific surface area of the porous structures including open and closed porosity. Calculated specific surface areas of 22.8 m(2)/g for a conventional sol-gel TiO(2) sample and 366 m(2)/g for a highly porous TiO(2) sample prepared using the Pluronic P-123 self-assembly process are compared with those measured by the general BET method. The real-space surface measurement indicates that the highly porous TiO(2) produced by the present method using block copolymers has a greater number of effective reaction sites for the degradation of methylene blue. Electron tomography shows a great potential to contribute considerably to the nanostructural analysis and design of such catalyst materials for photocatalysis.

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“…Currently, one of the most attractive materials for nanophotonic functional surfaces is titanium dioxide ͑TiO 2 ͒, which has a bandgap energy larger than 3 eV at room temperature. 22 The relevant applications of TiO 2 range from photocatalysis 23 over superwetting and antifogging 24 or photovoltaics 25 to gas sensors 26 and electronic devices. 27,28 Furthermore, this material is biocompatible and was proposed to be implemented in components of future biomedical technologies.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond-laser-induced quasiperiodic nanostructures on TiO2 surfaces

Das

Dufft

Rosenfeld

et al. 2009

Journal of Applied Physics

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High-spatial frequency, quasiperiodic structures ͑HSFL, Nanoripples͒ of 170 nm feature size were induced in rutile-type titanium dioxide surfaces by focused 150 fs Ti:sapphire laser pulses at wavelengths around 800 nm. The ripple formation is distinctly visible for numbers of pulses of N = 100-1000. At lower number of pulses ͑N =10͒, a significant surface roughening appears instead of ripples which is characterized by randomly meandering nanostructures. These observations confirm an essential contribution of early stage irregular material modifications to the dynamics of quasiperiodic ripple formation. The threshold fluence for ripple generation is estimated on the basis of the conventional theory of laser-induced surface structuring. The decrease in the threshold fluence from 0.34 to 0.24 J / cm 2 , as it was found for an increase in the number of pulses from N = 100 to N = 1000, is attributed to a damage accumulation effect. Nanostructuring of spatially extended regions was enabled by utilizing a controlled sample translation at optimized energy and repetition rate of the laser pulses. A significant enhancement of the periodicity of the nanostructures was confirmed by two-dimensional Fourier transform of scanning electron microscopy data. At second harmonic wavelengths around 400 nm, the generation of nanoripples even on the sub-100 nm scale was demonstrated.

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Preparation of strain-included rutile titanium oxide thin films and influence of the strain upon optical properties

Cited by 19 publications

References 32 publications

Third-order optical nonlinearities in anatase and rutile TiO2 thin films

Third-order optical nonlinearities in anatase and rutile TiO2 thin films

Specific Surface Area and Three-Dimensional Nanostructure Measurements of Porous Titania Photocatalysts by Electron Tomography and Their Relation to Photocatalytic Activity

Femtosecond-laser-induced quasiperiodic nanostructures on TiO2 surfaces

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