Room-temperature pulsed CVD-grown SiO<sub>2</sub> protective layer on TiO<sub>2</sub> particles for photocatalytic activity suppression

Guo, Jing; Yuan, Shaojun; Yu, Yangyang; Ommen, J. Ruud van; Liang, Bin

doi:10.1039/c6ra27976g

Cited by 37 publications

(23 citation statements)

References 43 publications

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“…It has been found that the growth of SiO 2 film on the TiO 2 surface is due to the hydrolysis of SiCl 4 vapor with the surface hydroxyl of TiO 2 . A similar growth mechanism was proposed for SnO 2 film since SnCl 4 can also react with hydroxyl groups .…”

Section: Results and Discussionmentioning

confidence: 71%

“…However, the formation of SiO 2 film by the CVD method requires high temperatures (above 600 °C) or the presence of NH 3 as catalyst . Recently, we presented a novel room-temperature pulsed CVD method of SiO 2 on TiO 2 nanoparticles based on the reaction of SiCl 4 with surface hydroxyl groups to obtain a coating layer with an effective thickness of >3 nm to ensure the suppression of TiO 2 photocatalytic activity . However, SiO 2 coating layers with the thickness of >3 nm may also result in a significant decrease in pigment properties such as lightening power of TiO 2 because the refractive index of SiO 2 (1.46) is much lower than that of anatase TiO 2 (2.55). ,, …”

Section: Introductionmentioning

confidence: 99%

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Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Zhu

Guo

et al. 2018

Ind. Eng. Chem. Res.

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TiO 2 pigments are widely used in paint industries. Inert coating layers were usually deposited on the TiO 2 pigments to suppress the photocatalytic activity of TiO 2 , which can prevent the degradation of surrounding polymer molecules. However, the traditional wet chemical methods normally form thick films, which would impair the pigment properties of TiO 2 . In this work, SnO 2 and SiO 2 protective layers were grown on the TiO 2 particle surface by lowtemperature pulsed chemical vapor deposition. At temperatures <60 °C, thin and uniform amorphous SnO 2 films were obtained. The photocatalytic activities of both TiO 2 /SnO 2 and TiO 2 /SiO 2 core−shell particles were suppressed, and TiO 2 /SnO 2 core− shell particles showed higher lightening power than TiO 2 /SiO 2 . According to transient fluorescence, photocurrent, and electrochemical impedance spectroscopy measurements, the low electron mobility of amorphous SnO 2 and SiO 2 films led to fast recombination of photogenerated electrons and holes, thus preventing their migration to the surface and suppressing the photocatalytic activity of TiO 2 .

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Section: Results and Discussionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Zhu

Guo

et al. 2018

Ind. Eng. Chem. Res.

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“…For instance, an ultrathin Al 2 O 3 coating was employed to improve the chemical, mechanical, and thermal stability of TiO 2 nanotube layers in extreme environments (Zazpe et al, 2017) such as for Li-ion batteries (Sopha et al, 2017a). On the other hand, a SiO 2 insulating layer was utilized to encapsulate TiO 2 nanoparticles to inhibit the photo catalytic activity, which undesirably darkens the white pigment of TiO 2 (Guo et al, 2017), and also to improve the cell compatibility and photo-killing ability (Feng et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

TiO2 ALD Coating of Amorphous TiO2 Nanotube Layers: Inhibition of the Structural and Morphological Changes Due to Water Annealing

Sopha

Zazpe

et al. 2019

Front. Chem.

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The present work presents a strategy to stabilize amorphous anodic self-organized TiO2 nanotube layers against morphological changes and crystallization upon extensive water soaking. The growth of needle-like nanoparticles was observed on the outer and inner walls of amorphous nanotube layers after extensive water soakings, in line with the literature on water annealing. In contrary, when TiO2 nanotube layers uniformly coated by thin TiO2 using atomic layer deposition (ALD) were soaked in water, the growth rates of needle-like nanoparticles were substantially reduced. We investigated the soaking effects of ALD TiO2 coatings with different thicknesses and deposition temperatures. Sufficiently thick TiO2 coatings (≈8.4 nm) deposited at different ALD process temperatures efficiently hamper the reactions between water and F− ions, maintain the amorphous state, and preserve the original tubular morphology. This work demonstrates the possibility of having robust amorphous 1D TiO2 nanotube layers that are very stable in water. This is very practical for diverse biomedical applications that are accompanied by extensive contact with an aqueous environment.

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“…At the same time, 50% of RIF is degraded by IP-TiO 2 , which further increases to 70% for Ag@IP-TiO 2 . From the linear regression of kinetic plots shown in Figure 5f, the first-order degradation rates are determined [43]. For P25 TiO 2 , a rate of 1.52 × 10 −3 min −1 is achieved, which is above three times higher than the self-degradation rate (i.e., 0.42 × 10 −3 min −1 ).…”

Section: Photocatalytic Activity Of Ip-tio 2 and Ag@ip-tiomentioning

confidence: 99%

TiO2 Inverse Opals Modified by Ag Nanoparticles: A Synergic Effect of Enhanced Visible-Light Absorption and Efficient Charge Separation for Visible-Light Photocatalysis

Bui

et al. 2021

Catalysts

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This work reports on the synthesis, characterization, and photocatalytic performance of the TiO2 inverse opal nanostructure (IP-TiO2) and the IP-TiO2 modified by Ag nanoparticles (Ag@IP-TiO2). The IP-TiO2 is fabricated using polystyrene spheres as the template and TiCl4 as the precursor, and the Ag@IP-TiO2 is realized by photoreduction method. The morphological, structural, and optical properties of the materials are investigated by scanning electron microscopy, X-ray diffraction, ultraviolet–visible (UV-VIS) absorption spectroscopy, and photoluminescence spectroscopy. Their photocatalytic performances are studied by the degradation of rifampicin antibiotic under the visible-light irradiation generated by an LED lamp. The results demonstrate that the IP-TiO2 is composed of mesopores arranged in the honeycomb structure and strongly absorbs visible light in the wavelength range of 400–500 nm. This facilitates the visible-light catalytic activity of IP-TiO2, which is further enhanced by the surface modification by Ag nanoparticles. Our studies on the UV-VIS absorption and photoluminescent properties of the materials reveal that the presence of Ag nanoparticles not only enhances the visible-light absorption of IP-TiO2, but also reduces the recombination of photogenerated electrons and holes. These two factors create a synergic effect that causes the enhanced photocatalytic performance of Ag@IP-TiO2.

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Room-temperature pulsed CVD-grown SiO₂ protective layer on TiO₂ particles for photocatalytic activity suppression

Abstract: Influence of initial surface states of TiO2 on the morphology of SiO2 films grown by CVD using SiCl4 and air at room temperature.

Cited by 37 publications

References 43 publications

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

TiO2 ALD Coating of Amorphous TiO2 Nanotube Layers: Inhibition of the Structural and Morphological Changes Due to Water Annealing

TiO2 Inverse Opals Modified by Ag Nanoparticles: A Synergic Effect of Enhanced Visible-Light Absorption and Efficient Charge Separation for Visible-Light Photocatalysis

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Room-temperature pulsed CVD-grown SiO2 protective layer on TiO2 particles for photocatalytic activity suppression

Abstract: Influence of initial surface states of TiO2 on the morphology of SiO2 films grown by CVD using SiCl4 and air at room temperature.

Cited by 37 publications

References 43 publications

Suppression of TiO2 Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO2 Protective Layer

Suppression of TiO2 Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO2 Protective Layer

TiO2 ALD Coating of Amorphous TiO2 Nanotube Layers: Inhibition of the Structural and Morphological Changes Due to Water Annealing

TiO2 Inverse Opals Modified by Ag Nanoparticles: A Synergic Effect of Enhanced Visible-Light Absorption and Efficient Charge Separation for Visible-Light Photocatalysis

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Resources

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Room-temperature pulsed CVD-grown SiO₂ protective layer on TiO₂ particles for photocatalytic activity suppression

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer

Suppression of TiO₂ Photocatalytic Activity by Low-Temperature Pulsed CVD-Grown SnO₂ Protective Layer