Nanoscale effects of silica particle supports on the formation and properties of TiO2 nanocatalysts

Li, Aize; Jin, Yuhui; Muggli, Darrin S.; Pierce, David T.; Aranwela, Hemantha; Marasinghe, G. K.; Knutson, Theodore R.; Brockman, Greg; Zhao, Julia Xiaojun

doi:10.1039/c3nr01287e

Cited by 32 publications

(25 citation statements)

References 58 publications

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“…In the interface‐nucleation mechanism of anatase‐to‐rutile (A → R) transformation, rutile starts to nucleate at the interface of aggregated anatase crystals and the rate of A → R transformation closely depends on initial particle size and degree of NPs aggregation . Thus, A → R transformation can be inhibited by keeping the particle size below 14 nm and reducing particles aggregation …”

Section: Introductionmentioning

confidence: 99%

“…One of the widely accepted strategies to achieve better particle dispersion and thus suppress phase transformation as well as exploit interface‐related phenomena is to support small TiO 2 NPs on inert supports oxide materials such as SiO 2 , Fe 2 O 3 , Al 2 O 3 , MoO 3 , and ZrO 2 . SiO 2 is a low cost material, has good thermomechanical stability and is transparent in the UV region where TiO 2 absorbs and is thus preferred material for supporting TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…SiO 2 is a low cost material, has good thermomechanical stability and is transparent in the UV region where TiO 2 absorbs and is thus preferred material for supporting TiO 2 . Additionally, the presence of silica enhances the catalytic and photocatalytic activity of TiO 2 …”

Section: Introductionmentioning

confidence: 99%

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The stability of titania‐silica interface

Staykov

Ferreira-Neto

Cruz

et al. 2017

Int J of Quantum Chemistry

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Silica is very often the catalyst support of choice for transition metal oxides such as titania, and specially anatase. Titania is an excellent absorber and photocatalyst for many organic molecules degradation. In order to understand the chemical nature of the interaction between titania and silica, we have performed a theoretical study using density functional theory aiming to elucidate the role on the stability of the interface of the specific type of interactions, H-bonding, covalent bonding of the pristine surfaces, and covalent bonding after silicon and titanium ions interdiffusion. The calculations were carried out for hydrogen and oxygen terminated surface, comparing the bonding types and the forces acting along the interface. The interface dynamics was studied for interfaces under applied stress in order to elucidate their stability and failure limits. The shearing forces and the mechanisms of interface failure were determined. Interfaces with interdiffused Si and Ti ions were studied to improve the interface stabilization. The results demonstrate that high-temperature treatment leading to formation of SiAOATi bonds at the interface is responsible for the formation of strong and flexible binding interaction between both oxides. At high strains, the SiAOATi interface failure is observed due to lattice mismatch between the SiO 2 and TiO 2 .The failure is a result of forces acting orthogonal to the interface shearing. In case of hydrogen terminated surface, the interface binding is a result of hydrogen bond network. Such interface is fragile at moderate shearing forces along the applied strain. The hydrogen bond network decreases the elastic properties and flexibility of the interface. The SiO 2 /TiO 2 interface is further stabilized by Si/Ti ion interdiffusion. The ionic interdiffusion process also increases the interface flexibility. Thus, in order to obtain more stable anatase photocatalyst supported on silica, the synthetic routes should favor silicon and titanium ions interdiffusion along the interface. K E Y W O R D S density functional theory, interface, silica, titania | I N TR ODU C TI ONTiO 2 is one of the most widely used semiconductor materials finding widespread application in materials chemistry, heterogeneous catalysis, photocatalysis, and many other fields. [1][2][3][4][5] The widespread use of TiO 2 in different fields stems from its low cost, good thermochemical stability, and suitable optical and electronic properties. The discovery of photocatalytic water-splitting on anatase surface under UV illumination [6] led to a new era of TiO 2 -based heterogeneous photocatalysis [2,3,5,[7][8][9][10] and huge efforts have been directed to improve the quantum yield of the process as well as extend the light harvesting ability of TiO 2 to the visible region of the spectrum. [11][12][13][14] Since the efficiency of the photocatalytic process greatly depends on the physical properties of the photocatalyts, [5,[15][16][17] many strategies have been proposed to achieve the formation of TiO 2 nanoparticle...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The stability of titania‐silica interface

Staykov

Ferreira-Neto

Cruz

et al. 2017

Int J of Quantum Chemistry

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“…However, with increasing film thickness, the XRD patterns for the 100-nm and 200-nm films show a decreasing trend for full-width half-maxima, suggesting nucleation of crystalline phases in the amorphous matrix. 20,21 XRD characterization of the binary-alloy (60.12 at.% Ag-39.88 at.% Cu) sputtering target was also carried out (Fig. 2d).…”

Section: Resultsmentioning

confidence: 99%

Metallic Glass Nano-composite Thin Films for High-performance Functional Applications

Das

Arora

Mukherjee

2017

JOM

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Metallic glass nanocomposite thin films were synthesized for an immiscible Ag-Cu alloy system by magnetron sputtering. The structure of the films was unique, consisting of homogeneously dispersed nanocrystallites in an amorphous matrix. The size and volume fraction of the nanocrystallites increased with increasing film thickness resulting in increased elastic modulus and hardness. The high electrical conductivity of the nanocomposite films was examined by a valence-band study, which showed that exchange interaction between Ag and Cu in the nanocomposite structure resulted in enhanced charge carrier concentration. The inverse correlation between electrical conductivity and film thickness was explained by surface and interface scattering of electrons with increasing volume fraction of nanocrystallites. The small temperature dependence of conductivity was attributed to the distorted Fermi surface of the nanocomposite films resulting in a greater contribution from structure scattering, which is temperature-independent.

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“…It is well established that the photocatalytic properties obviously depend on the crystallinity, light absorption and recombination rate of photogenerated hole-electron pairs and so on. [46][47][48][49][50][51] It is apparent that the crystallinity of TiO 2 -520 is higher than the crystallinity of SDT because the Sn doping will decrease the crystallinity. The SPV is available to investigate the electronic structure and interface charge transfer process of semiconductor.…”

Section: E Photocatalytic Activitymentioning

confidence: 99%

Biotemplated synthesis of Au loaded Sn-doped TiO₂ hierarchical nanorods using nanocrystalline cellulose and their applications in photocatalysis

et al. 2016

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Sn doped TiO 2 (SDT) hierarchical nanorods have been synthesized by using nanocystalline cellulose nanorod as biotemplate. Experimental results show that the phase transition from anatase to rutile can be realized by increasing the calcination temperature. In contrast to enhancing the calcination temperature, the Sn doping can more effectively improve the phase transition with remaining morphology due to the similar ionic radius and charge between Sn and Ti. The crystallinity, electronic structure, interface charge transfer process, and the specific surface area have a strong effect on the photocatalytic activity of the hierarchical TiO 2 and SDT nanorods. Furthermore, the photocatalytic activity of SDT hierarchical nanorods can be obviously improved by loaded Au nanoparticles on the surface due to the local surface plasmon resonance effect of Au and formation of a Schottky barrier at the Au/TiO 2 interface, which is in favor of the effective separation of photoinduced carriers and the formation of superoxide anion radicals.

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Nanoscale effects of silica particle supports on the formation and properties of TiO2 nanocatalysts

Cited by 32 publications

References 58 publications

The stability of titania‐silica interface

The stability of titania‐silica interface

Metallic Glass Nano-composite Thin Films for High-performance Functional Applications

Biotemplated synthesis of Au loaded Sn-doped TiO₂ hierarchical nanorods using nanocrystalline cellulose and their applications in photocatalysis

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Nanoscale effects of silica particle supports on the formation and properties of TiO2 nanocatalysts

Cited by 32 publications

References 58 publications

The stability of titania‐silica interface

The stability of titania‐silica interface

Metallic Glass Nano-composite Thin Films for High-performance Functional Applications

Biotemplated synthesis of Au loaded Sn-doped TiO2 hierarchical nanorods using nanocrystalline cellulose and their applications in photocatalysis

Contact Info

Product

Resources

About

Biotemplated synthesis of Au loaded Sn-doped TiO₂ hierarchical nanorods using nanocrystalline cellulose and their applications in photocatalysis