Study on electronic transport properties of WO3/TiO2 nanocrystalline thin films by photoassisted conductive atomic force microscopy

Wang, Shujie; Zhang, Xingtang; Cheng, Gang; Jiang, Xiaohong; Li, Yuncai; Huang, Yabin; Du, Zuliang

doi:10.1016/j.cplett.2005.01.118

Cited by 44 publications

(18 citation statements)

References 19 publications

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“…Such effective charge separation and transport processes could also be proved by our previous works. 10,14) The dynamic processes of photo-induced charge separation and transport were observed in the present TPV measurements. From Fig.…”

supporting

confidence: 51%

Dynamic Characterization of Charge Separation in WO$_{3}$–TiO$_{2}$ Nanoscale Heterojunction Investigated by the Transient Photovoltaic Technique

Cheng¹,

Qiao

Pang

et al. 2012

Appl. Phys. Express

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The dynamic photo induced charge separation and transport properties of pulsed-magnetron-sputtered TiO 2 , WO 3 , and WO 3 -TiO 2 double-layer films were investigated using the transient photovoltage (TPV) technique. Effective charge separation and transport were observed for the WO 3 -TiO 2 heterojunction, which was about three times larger than those of the TiO 2 and WO 3 single-layer films. The TPV response of the WO 3 -TiO 2 heterojunction peaked at 28 ns with a recombination lifetime of 179 ns. These results suggested that the electron injection from TiO 2 under illumination was the dominant factor for the separation of photo induced charge carriers in the WO 3 -TiO 2 double-layer films.

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confidence: 51%

Dynamic Characterization of Charge Separation in WO$_{3}$–TiO$_{2}$ Nanoscale Heterojunction Investigated by the Transient Photovoltaic Technique

Cheng¹,

Qiao

Pang

et al. 2012

Appl. Phys. Express

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“…To demonstrate the intricate relationship between structure and function, we investigated photoinduced charge transfer properties of mesocrystal superstructures by means of conductive atomic force microscopy (AFM) equipped with a UV light source (365 nm, Figure S10). , Figure a shows a typical AFM image of Meso-TiO 2 -500 on an indium tin oxide (ITO) electrode. Without UV irradiation, there was no measurable current response to the applied voltage at the marked point (Figure b).…”

mentioning

confidence: 99%

Superstructure of TiO₂ Crystalline Nanoparticles Yields Effective Conduction Pathways for Photogenerated Charges

Bian

Tachikawa

Majima

2012

J. Phys. Chem. Lett.

138

171

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Materials with intricate nanostructures display fascinating properties, which have inspired extensive research on the synthesis of materials with controlled structures. In this study, we investigated the properties of superstructures of TiO2 to understand the inter-relationship between structural ordering and photocatalytic performance. The nanoplate anatase TiO2 mesocrystals were chosen as the typical investigation objects, which were newly synthesized by a topotactic structural transformation. The TiO2 mesocrystals displayed the superstructure of crystallographically ordered alignment of anatase TiO2 nanocrystals with high surface area and large high-energy surface {001} planes exposed. The photoconductive atomic force microscopy and time-resolved diffuse reflectance spectroscopy were utilized to determine the charge transport properties of TiO2 mesocrystals, and their features were highlighted by a comparison with reference TiO2 samples, for example, anatase TiO2 nanocrystals with similar surface area and single crystal structure. Consequently, it was found for the first time that such a superstructure of TiO2 could largely enhance charge separation and had remarkably long-lived charges, thereby exhibiting greatly increased photoconductivity and photocatalytic activity.

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“…The linear portion of the plot was extended to the X axis to find the band gap of the material. The band gap of TiO 2 decreased from 3.11 to 2.93 eV during its composite preparation with WO 3 . − The band-gap value further declined to 2.74 eV in the case of the titanium-turnings-supported mixed-oxide nanocomposite, revealing its activity in the visible region.…”

Section: Results and Discussionmentioning

confidence: 94%

In Situ Surface Decoration of a Titanium Nanosubstrate by a TiO₂–WO₃ Composite

Krishnan

Shibli

2018

Ind. Eng. Chem. Res.

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An efficient TiO2 core/TiO2–WO3 shell structured nanocomposite is successfully synthesized by a method of acid precipitation followed by thermal decomposition. The metal weight ratio of TiO2–WO3 is optimized in order to achieve visible-light absorption. We made the mixed-oxide composite on titanium metal turnings in order to enhance the active surface area available for water-splitting reaction. The novelty of the present work mainly lies on the utterly different approach that we adopt for tuning of the composite with titanium turnings as the major material. The structural and morphological changes in the mixed oxide on the turnings are characterized in detail based on X-ray diffraction, Fourier transform infrared, transmission electron microscopy, scanning electron microscopy–energy-dispersive X-ray analysis, and Raman spectroscopy. The enhanced surface properties are evaluated based on Brunauer–Emmett–Teller adsorption. The band-edge position, band gap, and range of light absorption are envisaged by UV–visible spectroscopy. The photocatalytic activity of the composite is evaluated under visible-light irradiation. The volume of hydrogen gas evolved during water-splitting reaction is quantified after confirming the purity of the evolved hydrogen by gas chromatography. The mechanism of the enhanced water-splitting process by the fabricated photocatalytic system is then depicted. An appreciable quantity of pure hydrogen is produced by the catalyst composite, the stability and reproducibility of which is further ascertained by different experiments.

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Study on electronic transport properties of WO3/TiO2 nanocrystalline thin films by photoassisted conductive atomic force microscopy

Cited by 44 publications

References 19 publications

Dynamic Characterization of Charge Separation in WO$_{3}$–TiO$_{2}$ Nanoscale Heterojunction Investigated by the Transient Photovoltaic Technique

Dynamic Characterization of Charge Separation in WO$_{3}$–TiO$_{2}$ Nanoscale Heterojunction Investigated by the Transient Photovoltaic Technique

Superstructure of TiO₂ Crystalline Nanoparticles Yields Effective Conduction Pathways for Photogenerated Charges

In Situ Surface Decoration of a Titanium Nanosubstrate by a TiO₂–WO₃ Composite

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Study on electronic transport properties of WO3/TiO2 nanocrystalline thin films by photoassisted conductive atomic force microscopy

Cited by 44 publications

References 19 publications

Dynamic Characterization of Charge Separation in WO$_{3}$–TiO$_{2}$ Nanoscale Heterojunction Investigated by the Transient Photovoltaic Technique

Dynamic Characterization of Charge Separation in WO$_{3}$–TiO$_{2}$ Nanoscale Heterojunction Investigated by the Transient Photovoltaic Technique

Superstructure of TiO2 Crystalline Nanoparticles Yields Effective Conduction Pathways for Photogenerated Charges

In Situ Surface Decoration of a Titanium Nanosubstrate by a TiO2–WO3 Composite

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Superstructure of TiO₂ Crystalline Nanoparticles Yields Effective Conduction Pathways for Photogenerated Charges

In Situ Surface Decoration of a Titanium Nanosubstrate by a TiO₂–WO₃ Composite