The Preparation of Colloidal Precious Metal Particles Using Copolymers of Vinyl Alcohol–<i>N</i>-Vinylpyrrolidone

Meguro, Kenjiro; Nakamura, Yukari; Hayashi, Yoshihiro; Torizuka, Makoto; Esumi, Kunio

doi:10.1246/bcsj.61.347

Cited by 32 publications

(14 citation statements)

References 3 publications

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“…A number of polymers can be used as protective agents (e.g. poly(vinylalcohol), poly(methylvinylether), sodium polyacrylate, poly(N-vinylpyrrolidone) (PVP)); 15 such a component allows one to recover the fine particles as a polymer-based composite.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of poly(N‐vinylpyrrolidone) filled by monodispersed silver clusters with controlled size

Carotenuto

2001

Applied Organom Chemis

122

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Dispersions of very small metal particles in polymeric matrixes are scientifically and technologically important. Here, poly(N-vinylpyrrolidone) (PVP) filled with nanometric silver particles characterized by a narrow size distribution and a controlled average dimension has been obtained using a modification of the polyol process. In particular, the nanocomposite material was prepared by reduction of silver nitrate in ethylene glycol in the presence of ultrasound and PVP as a protective agent. The final particle size was controlled by removing the silver-PVP system from the reactive mixture by addition of acetone. The UV-visible spectrum of the material shows a very strong plasmon resonance band centred at 410 nm. The band position depends on the particle size and, consequently, the control of the particle growth process allows one to modulate the nanocomposite absorption wavelength. Such an important characteristic offers the possibility to use Ag-PVP nanocomposites to produce UV-absorbers and colour filters for advanced optical devices.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of poly(N‐vinylpyrrolidone) filled by monodispersed silver clusters with controlled size

Carotenuto

2001

Applied Organom Chemis

122

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“…Metallic nanodispersions can be prepared in aqueous and organic solvents using diverse procedures. − Nanodispersions can be stabilized in organic solvents by the solvent itself (e.g., naked gold sols in toluene),14b by the addition of long chain cationic surfactants (e.g., quaternary ammonium compounds), − or by specific ligands (e.g. sulfonated phosphines). , Stabilization of metal nanodispersions in aqueous solutions is somewhat more complicated, but still several successful stabilization methods are based on capping by buffer electrolytes (e.g., citrate) 8,9 or polyelectrolytes (e.g., poly(vinylpyrrolidine)). , Removal of the stabilizing agents induces immediate destabilization of the sol.…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis and Characterization of Gold and Other Noble Metal Nanodispersions in Sol−Gel-Derived Organically Modified Silicates

1999

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A general approach to prepare nanodispersions of noble metals in organically modified silicates is presented with particular emphasis on the synthesis of gold nanodispersion and its characterization. Organically modified sol−gel monomers containing amine functional groups are used to stabilize the metal salts before the reduction step and to cap and prevent coagulation of the metal sol after reduction and through gel formation, drying, and aging. Uniform spherical metal nanodispersions of Au, Pt, and Pd with average diameter of 4−6 nm were obtained. The particle size distribution and the average size of silver nanoparticles prepared by the same method were considerably larger. This was attributed to the lower stability of the silver−amine complex and to the lower affinity of amines to silver surfaces. Stable aqueous colloidal solutions and supported metal nanodispersions in porous films and monoliths can be prepared by this route.

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“…PVP has been used as a protective agent by other workers in the preparation of colloidal metal particles of controlled size. [6][7][8] …”

Section: Introductionmentioning

confidence: 99%

Nanoparticles of Ag, Au, Pd, and Cu produced by alcohol reduction of the salts

et al. 1997

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Nanoparticles of Ag, Au, Pd, and Cu have been prepared by the reduction of their salts by ethyl alcohol under refluxing conditions in the presence of polyvinylpyrrolidone (PVP). In the case of Au and Cu, it was necessary to use magnesium metal as a catalyst during the reduction. The nanoparticles are in the 5-35 nm range in the case of Ag, Au, and Pd, but there is considerable agglomeration in the case of Cu even in the presence of PVP.

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The Preparation of Colloidal Precious Metal Particles Using Copolymers of Vinyl Alcohol–N-Vinylpyrrolidone

Cited by 32 publications

References 3 publications

Synthesis and characterization of poly(N‐vinylpyrrolidone) filled by monodispersed silver clusters with controlled size

Synthesis and characterization of poly(N‐vinylpyrrolidone) filled by monodispersed silver clusters with controlled size

Direct Synthesis and Characterization of Gold and Other Noble Metal Nanodispersions in Sol−Gel-Derived Organically Modified Silicates

Nanoparticles of Ag, Au, Pd, and Cu produced by alcohol reduction of the salts

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