Investigation of local structures and photo-induced surface properties on transparent Me(Ti, Cr)-containing mesoporous silica thin films

Mori, Kohsuke; Imaoka, Sadaharu; Nishio, Shunya; Nishiyama, Yuko; Nishiyama, Norikazu; Yamashita, Hiromi

doi:10.1016/j.micromeso.2006.10.031

Cited by 21 publications

(3 citation statements)

References 34 publications

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“…The Ti-MSTF was prepared on a quartz plate (10 Â 10 Â 1 mm) by a sol-gel/spin-coating method in accordance with previous literature. [24][25][26] A mixture of TEOS as silica source, TEOT as titania source, Brij Ò 30 as structure directing agent (SDA), HCl and EtOH with the following molar ratio: TEOS + TEOT : Brij Ò 30 : HCl : EtOH ¼ 1.5 : 0.18 : 0.15 : 10 (Si : Ti ¼ 100 : 2) was stirred at 293 K for 20 min. The thus-obtained sol was dripped onto the quartz plate, spread evenly and coated at a spinning rate of 4 000 rpm for 1 min, followed by calcination in air at 523 K for 5 h at a heating rate of 1 K/min for the removal of the SDA.…”

Section: Synthesismentioning

confidence: 99%

Size-controlled synthesis of silver nanoparticles on Ti-containing mesoporous silica thin film and photoluminescence enhancement of rhodamine 6G dyes by surface plasmon resonance

et al. 2009

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Silver nanoparticles having a narrow size distribution were synthesized on Ti-containing mesoporous silica thin film (Ti-MSTF) using a simple photo-assisted deposition (PAD) method. Their particle sizes were successfully controlled by changing the photo-irradiation time during the deposition and average particle sizes at irradiation times of 1, 5 and 24 h were determined to be 2.7, 4.7 and 7.6 nm, respectively. The XPS depth profile analysis indicated that silver nanoparticles mainly exist not on the surface but in the thin film. UV-vis absorption spectra of these films showed an absorption band in the visible-wavelength region attributed to the surface plasmon resonance of silver nanoparticles. Rhodamine 6G (R6G) dye molecules were further embedded on Ti-MSTF after silver nanoparticle deposition. Photoluminescence properties of R6G dyes on these thin films were enhanced due to surface plasmon excitation from silver nanoparticles and the photoluminescence intensity reached up to 3 times as high as that achieved without silver nanoparticles. It was proven that the silver nanoparticle size had a strong influence on these enhancement effects.

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Section: Synthesismentioning

confidence: 99%

Size-controlled synthesis of silver nanoparticles on Ti-containing mesoporous silica thin film and photoluminescence enhancement of rhodamine 6G dyes by surface plasmon resonance

et al. 2009

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“…With the preparation of thin films, the use of AlPO-based materials can be widely extended from catalysis to various other applications such as electronic, chemical or optical sensing, and chemical separations. – A general route toward mesoporous metal phosphates has been recently developed by Tian et al, based on the “acid−base pair” concept, where the production of mesoporous AlPO thin films with a 2D hexagonal mesostructure has been demonstrated . More recently, Nishiyama et al developed Zr phosphate mesoporous films with a 2D hexagonal mesostructure, aiming at proton conductive membranes .…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Aluminophosphate Thin Films with Cubic Pore Arrangement

et al. 2008

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Mesoporous aluminophosphate thin films with 3D cubic (Im3m) pore arrangement were synthesized for the first time. Thin films were templated with block copolymer nonionic templates Pluronic F127 and F108 and deposited on a glass substrate by dip-coating. In situ SAXS investigations show the formation of a highly ordered mesostructure upon the dip-coating process, which remains stable up to at least 670 K. A cubic mesostructure was observed also by TEM. Template removal process was monitored by TG and FT-IR. A transition from an amorphous aluminophosphate gel to a well-defined aluminophosphate framework was observed by MAS NMR.

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“…These transition metal oxide moieties such as tetrahedrally coordinated titanium oxide moieties incorporated and isolated within silica matrixes have been named as ''single-site catalysts''. [6][7][8][9][10][11][12][13] Although the previous studies for the utilization of Ti-containing mesoporous silica have mainly been focused on their catalytic activity, the application to synthesize nano-sized metal catalysts has not been investigated so far.…”

Section: Introductionmentioning

confidence: 99%

Design of Nano-Sized Pt Metals Synthesized on Ti-Containing Mesoporous Silicas and Efficient Catalytic Application for NO Reduction

et al. 2008

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A novel method to prepare the nano-sized Pt metal catalysts is proposed. Mesoporous silicas containing highly dispersed titanium oxide species (Ti-HMS) can act as the platform to generate highly dispersed Pt metal particles. Characterization by Pt L III -egde XAFS, CO adsorption, and TEM analyses revealed that the size of formed Pt metal particles depends on the presence of titanium oxide species and that the smaller sizes of Pt metal particles was obtained with increasing the Ti contents in the silica matrix. These nano-sized Pt metal catalysts are useful as efficient catalysts for NO reduction, and higher conversion could be attained with smaller size of Pt metal particles. The present technique using Ticontaining mesoporous silicas as catalyst supports make a great contribution to minimize the amount of precious metals in order to meet today's industrial requirements.

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Investigation of local structures and photo-induced surface properties on transparent Me(Ti, Cr)-containing mesoporous silica thin films

Cited by 21 publications

References 34 publications

Size-controlled synthesis of silver nanoparticles on Ti-containing mesoporous silica thin film and photoluminescence enhancement of rhodamine 6G dyes by surface plasmon resonance

Size-controlled synthesis of silver nanoparticles on Ti-containing mesoporous silica thin film and photoluminescence enhancement of rhodamine 6G dyes by surface plasmon resonance

Mesoporous Aluminophosphate Thin Films with Cubic Pore Arrangement

Design of Nano-Sized Pt Metals Synthesized on Ti-Containing Mesoporous Silicas and Efficient Catalytic Application for NO Reduction

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