Effect of lattice distortion on bandgap decrement due to vanadium substitution in TiO2 nanoparticles

Khatun, Nasima; Rini, E.G.; Shirage, Parasharam M.; Rajput, Parasmani; Jha, S. N.; Sen, Somaditya

doi:10.1016/j.mssp.2016.04.002

Cited by 62 publications

(18 citation statements)

References 30 publications

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“…The 101 diffraction peak of the rutile titania slightly shifts to 36.05°, matching well with a =4.595 Å. The lattice distortions in TiO 2 can efficiently suppress the recombination rate of carriers and create the impurity energy levels as band tails, which could narrow the bandgap. The variation trend of lattice distortions in TiO 2 NCs suits well with the extrapolated values of intrinsic bandgap in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the mechanism of optimizing photocatalytic performance of TiO 2 for hydrogen evolution via introducing hydroxyls can be explained based on the above analysis (Figure ). On one hand, abundant hydroxyls induce the lattice distortion, which can efficiently suppress the recombination rate of photo‐generated charge carriers and create the impurity energy levels as band tails, thus promoting the photocatalytic performance. Besides, the presence of Ti 3+ ions could induce vacancy‐related electronic states under the conduction band maximum (CBM) from Ti 3+ 3d 1 and above the valance band maximum (VBM) from O 2p 6 , thus narrowing the bandgap of TiO 2 NCs.…”

Section: Resultsmentioning

confidence: 99%

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High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO₂ Nanocrystals for Water Splitting

Fan

Han

et al. 2019

ChemistrySelect

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Herein, a facile and controllable strategy to synthesize self‐hydroxylated TiO2 nanocrystals with promoted photocatalytic activity in hydrogen evolution is demonstrated. Various colors (yellow, light yellow, blueish gray and gray) in appearance are induced by controlling the molar ratio of titanium source to oxidant during the hydrothermal treatment. Compared with commercial P25 TiO2 nanoparticles, the as‐obtained self‐hydroxylated TiO2 nanocrystals exhibit better photocatalytic performance in H2 evolution. Specifically, the maximum hydrogen evolution rate under solar light illumination (10.0 mmol/h/g) is 4.6 times superior to that of P25. The characterization results confirm the presence of abundant hydroxyls resulting from the hydrothermal treatment, which decreases the recombination rate of carriers and the energy barrier of hydrogen formation while facilitates light absorption for promoting photocatalytic performance.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO₂ Nanocrystals for Water Splitting

Fan

Han

et al. 2019

ChemistrySelect

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“…Apart from Ti 3+ ions, other transition metals, such as copper (Cu), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe) and nickel (Ni), are typically employed to enhance the visible-light photocatalytic activity of titania [88][89][90][91][92][93][94][95][109][110][111][112][113][114][115]. The redshift effectiveness takes the following order: V > Cr > Mn > Fe > Ni [86].…”

Section: Metal Dopingmentioning

confidence: 99%

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

2020

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This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.

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“…This is significant The observation of the TiO 2 nanoparticles' morphology commonly requires magnification up to 30,000 times [54]. However, higher magnification up to 200,000 times has also been reported in characterising the surface morphology of TiO 2 nanoparticles [52,55]. These mainly depend on the condition of TiO 2 nanoparticles prior to characterisation.…”

Section: Field Emission Scanning Electron Microscopementioning

confidence: 99%

Recent Characterisation of Sol-Gel Synthesised TiO2 Nanoparticles

Yahaya¹,

Azam²,

Mat-Teridi³

et al. 2017

Recent Applications in Sol-Gel Synthesis

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High demand and current applications have led to continuous study and subsequent improvement of TiO 2 nanoparticles. The versatility of the sol-gel method allows employing different process parameters to influence the resultant properties of TiO 2 nanoparticles. The evaluation and characterisation process of the synthesised TiO 2 nanoparticles commonly involves a series of methods and techniques. Such characterisation methods include phase, structural, morphology and size analysis. A combination of data from these evaluations provides the relationship between the synthesis parameters and the end properties of TiO 2 nanoparticles. Apart from the research findings on TiO 2 nanoparticles, the characterisation used to obtain these findings is equally important. Thus, this chapter highlights the recent characterisation techniques and practices employed for TiO 2 nanoparticles synthesised by the sol-gel method.

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Effect of lattice distortion on bandgap decrement due to vanadium substitution in TiO2 nanoparticles

Cited by 62 publications

References 30 publications

High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO₂ Nanocrystals for Water Splitting

High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO₂ Nanocrystals for Water Splitting

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

Recent Characterisation of Sol-Gel Synthesised TiO2 Nanoparticles

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Effect of lattice distortion on bandgap decrement due to vanadium substitution in TiO2 nanoparticles

Cited by 62 publications

References 30 publications

High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO2 Nanocrystals for Water Splitting

High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO2 Nanocrystals for Water Splitting

Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties

Recent Characterisation of Sol-Gel Synthesised TiO2 Nanoparticles

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Product

Resources

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High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO₂ Nanocrystals for Water Splitting

High‐Efficiency Photocatalysis of Self‐Hydroxylated TiO₂ Nanocrystals for Water Splitting