Preparation of Au-Doped Silica Glass by Sol-Gel Method

Matsuoka, Jun; Mizutani, Ryoichi; Nasu, Hiroyuki; Kamiya, Kanichi

doi:10.2109/jcersj.100.599

Cited by 36 publications

(14 citation statements)

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“…On the other hand, in the Au:AI203 film Au microcrystals are not formed by the heat treatment at 200~ as well as in the Au:SiO2 films [10]. Therefore, it can be assumed that TiQ and ZrO2 can act as a catalyst for decomposition of AuC14, but A1203 and SiO2 cannot do, and the catalytic activity is independent from PZC.…”

Section: Discussionmentioning

confidence: 99%

“…Adopting this type of method, Au microcrystaldoped silica glasses have been prepared by using NaAuCI4.2H20 [10,11] or HAuCI4-4H20 [12,13] as starting materials of Au. In the other type of method, Au microcrystals are prepared in aqueous or organic solutions, and then, they are incorporated into porous oxide gels or alkoxide solutions to be gelled [12,[14][15][16][17].…”

Section: *Present Address: School Of Engineering the University Of Smentioning

confidence: 99%

“…In our previous works, Au-microcrystals with the average diameter of 8 nm were incorporated into SiO2 dip-coating films by using NaAuCI4 9 2H20 and Si(OC2H5)4 (TEOS) as starting materials and HC1 as a hydrolysis-catalyst [ 10,11]. In this case, the maximum amount of Au microcrystals incorporated in the silica film was 0.04 in the molar ratio to SiO2 (Au/SiO2).…”

Section: *Present Address: School Of Engineering the University Of Smentioning

confidence: 99%

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Preparation of gold microcrystal-doped TiO2, ZrO2 and Al2O3 films through sol-gel process

Matsuoka

Yoshida

Nasu

et al. 1997

J Sol-Gel Sci Technol

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Abstract. Au-microcrystal-doped TiO2, ZrO2 and A1203 films were made by sol-gel dip-coating method using titanium, zirconium and aluminum alkoxides with HAuCI4 9 4H20. The influence of the oxide matrix composition on the maximum amount of the Au microcrystals that can be incorporated in the oxide film was examined. Some amount of Au microcrystals were exhausted to the surface of Au microcrystal-doped oxide films when an excess amount of HAuC14 9 4H20 was dissolved in the coating solution. The maximum amount of Au that can be incorporated in the oxide film was found to increase with the increase of the pH point at zero charge (PZC) of the matrix oxide. This should be due to the fact that AuCl 4 ions are charged negative and also Au microcrystals tend to charge negative, so that the oxide gel with high PZC, which has a tendency to charge positive, may fix the ions and/or microcrystals to its interior. A maximum amount of Au microcrystals as high as 12.6 vol% was attained in an Au:Al203 film.

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Section: Discussionmentioning

confidence: 99%

Section: *Present Address: School Of Engineering the University Of Smentioning

confidence: 99%

Section: *Present Address: School Of Engineering the University Of Smentioning

confidence: 99%

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Preparation of gold microcrystal-doped TiO2, ZrO2 and Al2O3 films through sol-gel process

Matsuoka

Yoshida

Nasu

et al. 1997

J Sol-Gel Sci Technol

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“…sputtering 21 and pyrolysis of precursor molecules in a sol-gel film. 22,23 These methods are often expensive and time consuming.…”

Section: Introductionmentioning

confidence: 99%

Determination of cyanide in waste water by low‐resolution surface enhanced Raman spectroscopy on sol‐gel substrates

Premasiri

Clarke

Londhe

et al. 2001

J Raman Spectroscopy

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We introduce the concept of low-resolution surface enhanced Raman spectroscopy (SERS) for cyanide as a potentially highly useful, cost-effective approach to detection and analysis for monitoring water contamination. We present high-sensitivity, low-resolution measurements of cyanide in water using a solid-state gold sol-gel substrate. These data suggest a sensitivity limit for low-resolution SERS detection of cyanide in water in the region of 10 ppb.

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“…Anion species analysis of protein ( 7,8 ) . Usually, they are prepared by vapor deposition such as Cl 0 and -COO 0 or surface active reagents, which make gold ( 9 ) or the sol -gel method ( 10,11 ) . In these methods, fine gold particles particles stable in water, are not added in the present colloid solution.…”

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confidence: 99%