Size effect of TiO2–SiO2 nano-hybrid particle

Ohno, Tomoya; Tagawa, Shouichiroh; Itoh, Hidenori; Suzuki, Hisao; Matsuda, Takeshi

doi:10.1016/j.matchemphys.2008.07.034

Cited by 72 publications

(37 citation statements)

References 20 publications

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“…Although the sol-gel method is considered as a suitable method to synthesize ultra-fine particles, this method needs a large quantity of solution, longer processing time and heat treatment for crystallization since amorphous TiO 2 has a very little photocatalytic activity. The photo catalytic efficiency of Titania (TiO 2 ) depends highly on particle size and surface area of the material (Hakki et al 2009;Ohno et al 2009). The efficiency of TiO 2 for dye-sensitized solar cells (DSSC) is highly depending on particle size and surface area.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of TiO2/SiO2 nano composites for solar cell applications

Kumar¹,

Shyla²,

Xavier³

2012

Appl Nanosci

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The use of titania-silica in photocatalytic process has been proposed as an alternative to the conventional TiO 2 catalysts. Mesoporous materials have been of great interest as catalysts because of their unique textural and structural properties. Mesoporous TiO 2 , SiO 2 nanoparticles and TiO 2 /SiO 2 nanocomposites were successfully synthesized by sol-gel method using titanium (IV) isopropoxide, tetra-ethylorthosilicate as starting materials. The synthesized samples are characterized by X-ray diffraction, UV-Vis spectroscopy, Fourier transform infrared spectroscopy, Brunauett-Emmett-Teller and field-dependent photoconductivity. The UV-Vis spectrum of as-synthesized samples shows similar absorption in the visible range. The crystallite size of the as-synthesized samples was calculated by Scherrer's formula. The BET surface area for TiO 2 /SiO 2 nanocomposite is found to be 303 m 2 /g and pore size distribution has average pore diameter about 10 nm. It also confirms the absence of macropores and the presence of micro and mesopores. The field-dependent photoconductivity of TiO 2 /SiO 2 nanocomposite shows nearly 300 folds more than that of TiO 2 nanoparticle for a field of 800 V/cm.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of TiO2/SiO2 nano composites for solar cell applications

Kumar¹,

Shyla²,

Xavier³

2012

Appl Nanosci

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“…From Table 2, the formation of TiO2-SiO2 has higher specific area and pore volume compared to RHA. It would provide more surface sites for adsorption of reactant molecules and enhance photocatalytic activity [7]. This is due to the formation of titania particles on the surface of SiO2.…”

Section: Resultsmentioning

confidence: 99%

Preparation of TiO2-SiO2 using Rice Husk Ash as Silica Source and The Kinetics Study as Photocatalyst in Methyl Violet Decolorization

Fatimah

Said

Hasanah

2014

Bull. Chem. React. Eng. Catal.

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Preparation, characterization and utilization of TiO2-SiO2 as photocatalyst for methyl violet (MV) decolorization has been conducted. In this research, preparation of TiO2-SiO2 was developed based on natural renewable silica source; rice husk ash (RHA) via a sol-gel technique. The composite was formed by the dispersing of titanium isopropoxide as titania precursor into the gel of silica followed by aging, drying and calcination. The TiO2-SiO2 sample was characterized by powder X-ray diffraction (XRD), diffuse reflectance-UV Visible spectrophotometric analysis (DRUV-Vis), gas sorption analyzer and Scanning electron micrograph (SEM) before its utilization as photocatalyst in methyl violet photooxidation. As comparison to the physicochemical character study, the synthesis of TiO2-SiO2 by using tetraethyl ortosilicate (TEOS) was performed as a confirmation. Result showed that prepared TiO2-SiO2 has the character similar to TiO2-SiO2 as synthesized by TEOS precursor. The formation of crystalline titania in anatase and rutile phase was identified with increasing surface porosity data and the value of band gap energy which sufficiently contribute to a photocatalytic mechanism. The character data are in line with the kinetic data of methyl violet decolorization. From the compared photooxidation, photolysis, photocatalysis and adsorption process, it can be concluded that TiO2-SiO2 acts efficiently as a photocatalyst.

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“…The obtained TiO 2 -SiO 2 hybrid particles were in sub-micron size, but showed the blue shift of the band gap energy due to the quantum size effect [5]. This result indicated that the characteristic of particles was improved by hybridization.…”

Section: Introductionmentioning

confidence: 90%

The agglomeration control of alkoxide derived TiO<sub>2</sub>-SiO<sub>2</sub> hybrid nano-particle

Tagawa

Ohno

Suzuki

et al. 2011

Trans. Mat. Res. Soc. Japan

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This paper describes the effects of the drying conditions of titania-silica (TiO 2 -SiO 2 ) sol on the dispersibility of the hybrid particles. The hybrid sol of SiO 2 nano-particles coated with TiO 2 was prepared by a sol-gel process with controlled chemical modification (CCM). The effects of the initial pressure of supercritical drying (SCD) and the zeta potential in the sol on the dispersibility of the particles were investigated to obtain the well-dispersed TiO 2 -SiO 2 hybrid particles. As a result, well-dispersed TiO 2 -SiO 2 hybrid particles were successfully prepared by controlling the initial pressure of SCD and/or the zeta potential.

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Size effect of TiO2–SiO2 nano-hybrid particle

Cited by 72 publications

References 20 publications

Synthesis and characterization of TiO2/SiO2 nano composites for solar cell applications

Synthesis and characterization of TiO2/SiO2 nano composites for solar cell applications

Preparation of TiO2-SiO2 using Rice Husk Ash as Silica Source and The Kinetics Study as Photocatalyst in Methyl Violet Decolorization

The agglomeration control of alkoxide derived TiO<sub>2</sub>-SiO<sub>2</sub> hybrid nano-particle

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