Thermal activation of the electronic transport in porous titanium dioxides

Dittrich, Th.; Weidmann, J.; Timoshenko, V. Yu.; Petrov, Andrey A.; Koch, F.; Lisachenko, M. G.; Lebedev, E. A.

doi:10.1016/s0921-5107(99)00281-0

Cited by 37 publications

(22 citation statements)

References 16 publications

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“…40 A similar result was obtained from time-of-flight experiments, which gave an activation energy of 0.75-0.8 eV for drift mobility and 0.8-0.9 eV for electrical conductivity. 41 Previously, the same group reported an activation energy of 0.45 eV for electron mobility in porous TiO 2 films. 42 None of these studies considers the effect of electron density or an electrolyte on the activation energy or measures the electron mobility or diffusion coefficient directly.…”

Section: Resultsmentioning

confidence: 96%

Temperature dependence of the electron diffusion coefficient in electrolyte-filledTiO2nanoparticle films: Evidence against multiple trapping in exponential conduction-band tails

et al. 2006

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The temperature and photoexcitation density dependences of the electron transport dynamics in electrolytefilled mesoporous TiO 2 nanoparticle films were investigated by transient photocurrent measurements. The thermal activation energy of the diffusion coefficient of photogenerated electrons ranged from 0.19-0.27 eV, depending on the specific sample studied. The diffusion coefficient also depends strongly on the photoexcitation density; however, the activation energy has little, if any, dependence on the photoexcitation density. The light intensity dependence can be used to infer temperature-independent dispersion parameters in the range 0.3-0.5. These results are inconsistent with the widely used transport model that assumes multiple trapping of electrons in an exponential conduction-band tail. We can also exclude a model allowing for widening of a band tail with increased temperature. Our results suggest that structural, not energetic, disorder limits electron transport in mesoporous TiO 2 . The analogy between this material and others in which charge transport is limited by structural disorder is discussed.

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Section: Resultsmentioning

confidence: 96%

Temperature dependence of the electron diffusion coefficient in electrolyte-filledTiO2nanoparticle films: Evidence against multiple trapping in exponential conduction-band tails

et al. 2006

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“…10 -9 S cm -1 . [66] Heat treatment of titanate nanotubes in vacuum at 100°C or more resulted in the appearance of a symmetrical electron spin resonance signal with a g factor of 2.003. [67] Jin and co-workers attributed this signal to the single-electron trapped oxygen vacancies.…”

Section: Electrical Conductivity Thermal Conductivity and Magnetic mentioning

confidence: 99%

Protonated Titanates and TiO₂ Nanostructured Materials: Synthesis, Properties, and Applications

Bavykin¹,

Friedrich²,

Walsh³

2006

Advanced Materials

1,391

1,013

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Tubular and fibrous nanostructures of titanates have recently been synthesized and characterized. Three general approaches (template assisted, anodic oxidation, and alkaline hydrothermal) for the preparation of nanostructured titanate and TiO2 are reviewed. The crystal structures, morphologies, and mechanism of formation of nanostructured titanates produced by the alkaline hydrothermal method are critically discussed. The physicochemical properties of nanostructured titanates are highlighted and the links between properties and applications are emphasized. Examples of early applications of nanostructured titanates in catalysis, photocatalysis, electrocatalysis, lithium batteries, hydrogen storage, and solar‐cell technologies are reviewed. The stability of titanate nanotubes at elevated temperatures and in acid media is considered.

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“…14-46 GPa [39,40] n.a. Electrical conductivity 1.5 Â 10 À 6 -7.9 Â 10 À 7 S cm À 1 [59,60] $10 À 7 S cm À 1 for porous films of NWs and $10 À 1 S cm…”

Section: Nanotubementioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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Thermal activation of the electronic transport in porous titanium dioxides

Cited by 37 publications

References 16 publications

Temperature dependence of the electron diffusion coefficient in electrolyte-filledTiO2nanoparticle films: Evidence against multiple trapping in exponential conduction-band tails

Temperature dependence of the electron diffusion coefficient in electrolyte-filledTiO2nanoparticle films: Evidence against multiple trapping in exponential conduction-band tails

Protonated Titanates and TiO₂ Nanostructured Materials: Synthesis, Properties, and Applications

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

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Thermal activation of the electronic transport in porous titanium dioxides

Cited by 37 publications

References 16 publications

Temperature dependence of the electron diffusion coefficient in electrolyte-filledTiO2nanoparticle films: Evidence against multiple trapping in exponential conduction-band tails

Temperature dependence of the electron diffusion coefficient in electrolyte-filledTiO2nanoparticle films: Evidence against multiple trapping in exponential conduction-band tails

Protonated Titanates and TiO2 Nanostructured Materials: Synthesis, Properties, and Applications

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

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Protonated Titanates and TiO₂ Nanostructured Materials: Synthesis, Properties, and Applications