Synthesis of Submicron-Sized Titania-Coated Silica Particles with a Sol-Gel Method and Their Application to Colloidal Photonic Crystals

Mine, Eiichi; Hirose, Mitsuaki; Kubo, Masaki; Kobayashi, Yoshio; Nagao, Daisuke; Konno, Mikio

doi:10.1007/s10971-006-5855-y

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…The coating step of the method described here, being a modification of the titania particle synthesis method described elsewhere [ 52 – 53 ], small volumes of the concentrated aqueous suspensions of synthesized NPs were transferred into a mixture of ethanol and acetonitrile. The hydrolysis reaction catalyst, methylamine, was then added to a suspension of NPs.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of noble metal–titania core–shell nanostructures with tunable shell thickness

Bartosewicz¹,

Michalska-Domańska²,

Liszewska³

et al. 2017

Beilstein J. Nanotechnol.

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Core–shell nanostructures have found applications in many fields, including surface enhanced spectroscopy, catalysis and solar cells. Titania-coated noble metal nanoparticles, which combine the surface plasmon resonance properties of the core and the photoactivity of the shell, have great potential for these applications. However, the controllable synthesis of such nanostructures remains a challenge due to the high reactivity of titania precursors. Hence, a simple titania coating method that would allow better control over the shell formation is desired. A sol–gel based titania coating method, which allows control over the shell thickness, was developed and applied to the synthesis of Ag@TiO2 and Au@TiO2 with various shell thicknesses. The morphology of the synthesized structures was investigated using scanning electron microscopy (SEM). Their sizes and shell thicknesses were determined using tunable resistive pulse sensing (TRPS) technique. The optical properties of the synthesized structures were characterized using UV–vis spectroscopy. Ag@TiO2 and Au@TiO2 structures with shell thickness in the range of ≈40–70 nm and 90 nm, for the Ag and Au nanostructures respectively, were prepared using a method we developed and adapted, consisting of a change in the titania precursor concentration. The synthesized nanostructures exhibited significant absorption in the UV–vis range. The TRPS technique was shown to be a very useful tool for the characterization of metal–metal oxide core–shell nanostructures.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of noble metal–titania core–shell nanostructures with tunable shell thickness

Bartosewicz¹,

Michalska-Domańska²,

Liszewska³

et al. 2017

Beilstein J. Nanotechnol.

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“…Among synthesis techniques of particles, a liquid phase process, especially sol-gel process, is a superior one to prepare monodispersed particles [1][2][3][4][5]. The so-called "Stöber method" is an excellent process to prepare monodispersed silica particles using sol-gel process [6], and silica particles with a diameter of about 100 nm to a few m are easily prepared by this method [7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of monodispersed silica nanoparticles with high concentration by the Stöber process

Tadanaga

Morita

Mori

et al. 2013

J Sol-Gel Sci Technol

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Silica nanoparticles with high concentration were prepared by the sol-gel process based on the Stöber method using tetraethoxysilane (TEOS) as a starting material. It was found that silica sol with about 4 wt% in concentration and with a diameter of about 10 nm was obtained by controlling the reaction conditions in the Stöber process. By removing the solvent under a reduced pressure, the particle concentration was increased up to 15 wt% without aggregation.

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“…[2][3][4][5][6] In recent years, metallic layers have been formed on polymer beads by various methods, including multiple electroless deposition, the electroplating method, direct metallization, sputtering, thermal evaporation, and the sol-gel method, to produce conductive beads. [7][8][9][10][11][12] For example, Lascelles et al reported the coating of micro-sized polystyrene (PS) beads with polypyrrole (PPy) by the insitu polymerization of pyrrole with FeCl 3 in aqueous solution. [13] Although many reports have been published on the preparation of metal-coated polymers, there have been few studies of the metal-polymer interface and the metal composition of the shell layers.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, metallic layers have been formed on polymer beads by various methods, including multiple electroless deposition, the electroplating method, direct metallization, sputtering, thermal evaporation, and the sol–gel method, to produce conductive beads 7–12. For example, Lascelles et al reported the coating of micro‐sized polystyrene (PS) beads with polypyrrole (PPy) by the in‐situ polymerization of pyrrole with FeCl 3 in aqueous solution 13.…”

Section: Introductionmentioning

confidence: 99%

Large Deformable Multiwalled Carbon Nanotube Core–Shell Structure on Polystyrene Beads

Lee

Nam

2008

Macromol. Rapid Commun.

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Multiwalled carbon nanotube (MWCNT)-coated polystyrene (PS) beads have been prepared by dispersion polymerization followed by a layer-by-layer self-assembly method. The concentration of carboxylic acid groups on the MWCNTs increased from 1.81 × 10(21) to 3.43 × 10(22) COO(-) per g as the treatment time was increased from 3 to 9 h. The sulfonated polystyrene (SPS) beads changed from being negatively charged to positively charged when the cationic polyelectrolyte was self-assembled on their surface. The surface morphology of the adsorbed polyelectrolyte was smooth without any aggregation and the thickness of the polyelectrolyte coating on the SPS beads was ≈0.6 µm. The electrical conductivity and resistance of the MWCNT-coated SPS beads were measured to be 4.0 × 10(-2) S · cm(-1) and 12.8 Ω at a volume fraction of 91%, respectively.

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Synthesis of Submicron-Sized Titania-Coated Silica Particles with a Sol-Gel Method and Their Application to Colloidal Photonic Crystals

Cited by 25 publications

References 16 publications

Synthesis and characterization of noble metal–titania core–shell nanostructures with tunable shell thickness

Synthesis and characterization of noble metal–titania core–shell nanostructures with tunable shell thickness

Synthesis of monodispersed silica nanoparticles with high concentration by the Stöber process

Large Deformable Multiwalled Carbon Nanotube Core–Shell Structure on Polystyrene Beads

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