Facile Synthesis of Mesoporous Gold−Silica Nanocomposite Materials via Sol−Gel Process with Nonsurfactant Templates

Cheng, Shan; Wei, Yen; Qin, Feng; Qiu, Kun-Yuan; Pang, Jiebin; Jansen, Susan A.; Yin, Ruoyu; Ong, Kate K.

doi:10.1021/cm0202106

Cited by 38 publications

(26 citation statements)

References 43 publications

(56 reference statements)

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“…Even though the size, shape and crystalline domains of the AuNPs remain unchanged during the synthesis process, the catalytic activity was not evaluated. Chen et al [169] prepared mesoporous gold-silica nanocomposites (Au loading from 6.9 to 11.4%wt) using a simple one-step method involving the sol-gel reaction of the silica precursor (TEOS) with a gold sol (Liquid Bright Gold 5154, containing 5%wt metallo-organic gold compound in cyclohexanone) in the presence of DBTA as a nonsurfactant template. After removal of DBTA by calcination at 550 °C during 16 h, the mesoporous worm-hole-like structure of the gold-silica nanocomposites, with AuNPs ranging between 2 and 8 nm dispersed throughout the silica porous matrix, showed high surface area (up to 630 m 2 /g), large pore volume (~0.5 cm 3 /g) and pore diameters of 3-5 nm with relatively narrow pore size distributions.…”

Section: Synthesis By Dispersion Of Gold Colloids or Presynthesized Amentioning

confidence: 99%

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

2011

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Mesoporous silica materials (MSM) with ordered and controllable porous structure, high surface area, pore volume and thermal stability are very suitable catalyst supports, because they provide high dispersion of metal nanoparticles and facilitate the access of the substrates to the active sites. Since the conventional wet-impregnation and deposition-precipitation methods are not appropriate for the incorporation of gold nanoparticles (AuNPs) into MSM, considerable efforts have been made to develop suitable methods to synthesize Au/MSM catalysts, because the incorporation of AuNPs into the channel system can prevent their agglomeration and leaching. In this review, we summarize the main methods to synthesize active gold catalysts supported on MSM. Examples and details of the preparative methods, as well as selected applications are provided. We expect this article to be interesting to researchers due to the wide variety of chemical reactions that can be catalyzed by gold supported catalysts.

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Section: Synthesis By Dispersion Of Gold Colloids or Presynthesized Amentioning

confidence: 99%

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

2011

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“…[5][6][7][8] Several methods, such as ion-exchange, multitarget sputtering, ion implantation, sol-gel, and so forth, have been used to control the chemical and structural factors effectively. [1][2][3][4][5][6][7][8][9][10] Despite some notable properties, these processes have a few limitations. These include low nanocluster concentrations, difficulties in mass production, a large amount of carbon contamination, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Silver-nanoparticle dispersion from the consolidation of Ag-attached silica colloid

Kim

Kim³

et al. 2004

J. Mater. Res.

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Silver nanoparticles dispersed in a silica matrix were made by the consolidation of a Ag-attached silica colloid, which was synthesized via the electrolysis of a pure Ag electrode, the reduction of Ag + ions by H 2 , and the nucleation and growth of Ag particles on the silica nanoparticles in water. This simple process produced Ag/silica nanocomposites with a high concentration and narrow size distribution of nanoparticles, which was confirmed by transmission electron microscopy and x-ray diffraction. As estimated by Raman and photoluminescence measurements, the quantity of broken oxygen bonds was increased with increasing Ag concentration due to the intervention of Ag ions as structural modifiers in the silica network structure. Ag ions in the matrix are probably a residue of the Ag + ions that could not be reduced by H 2 during the electrolysis/reduction reaction. The optical-absorption spectra and the HCl-soaking test suggested that a chemical-interface damping effect, which was caused by electron transfer from the metal particles to the oxide matrix, dominates the optical-absorption properties in this system.

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“…136 Gold colloids were also introduced during the gelling step of mesoporous silica synthesis. 137 Calcination at 550 1C led to homogeneously distributed 2-8 nm particles for Au loadings up to 10 wt%. The gold colloids can be also coated by the surfactant used for the synthesis of mesoporous materials.…”

Section: Sol-gel Co-synthesismentioning

confidence: 94%

Synthesis and Physicochemical Properties of Gold‐based Catalysts

Louis

2013

Environmental Catalysis Over Gold-Based Materials

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This chapter focuses on the chemical methods that are used for the preparation of gold‐based catalysts with the aim of forming small metal particles (<5 nm) stabilised on solid supports. The chapter mainly gathers the advances in gold catalyst preparation made since 2006, i.e. since the publication of the very first book on Catalysis by Gold (G. C. Bond, C. Louis and D. Thompson, Catalysis by Gold, Imperial College Press, London, 2006, vol. 6). Emphasis is given to the most frequently used preparation methods and to their new development, the new preparation methods, new supports and the recent development of gold‐based bimetallic catalysts.

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Facile Synthesis of Mesoporous Gold−Silica Nanocomposite Materials via Sol−Gel Process with Nonsurfactant Templates

Cited by 38 publications

References 43 publications

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

Silver-nanoparticle dispersion from the consolidation of Ag-attached silica colloid

Synthesis and Physicochemical Properties of Gold‐based Catalysts

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