Dispersion and Optical Absorption of Au and Ag Particles Supported on an Amorphous SiO2 Substrate

Arai, Masahiko; Mitsui, Misato; Ozaki, Jun‐ichi; Nishiyama, Yoshiyuki

doi:10.1006/jcis.1994.1444

Cited by 13 publications

(7 citation statements)

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“…Porous vicor glass, organoclay complexes, zeolites, and nanoporous membranes have been employed as hosts for size-quantized semiconductor and metallic particles . More recently, size-quantized silver, , gold, and cadmium sulfide , particles have been prepared and stabilized on the surfaces and within the pores of colloidal silica particles. , …”

Section: Introductionmentioning

confidence: 99%

“…Porous vicor glass, organoclay complexes, zeolites, and nanoporous membranes have been employed as hosts for size-quantized semiconductor and metallic particles. 1 More recently, size-quantized silver, 4,5 gold, 5 and cadmium sulfide 6,7 particles have been prepared and stabilized on the surfaces and within the pores of colloidal silica particles. 1,2 Judicious selection of the composition of the liquid used for dispersing the colloidal hosts provides an additional control for the growth and stabilization of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of CdS and ZnS Particles in Nanophase Reactors Provided by Binary Liquids Adsorbed at Colloidal Silica Particles

Dékány¹,

Nagy²,

Túri³

et al. 1996

Langmuir

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Determinations of adsorption excess isotherms of silica particle dispersions in ethanol−cyclohexane and in methanol−cyclohexane binary mixtures have established the formation of 0.5−5.0 nm thick alcohol rich adsorption layers at the silica particle interface. The adsorption layers on silica particles, formed in methanol−cyclohexane = 0.01:99.99 (mol/mol) and ethanol−cyclohexane = 0.05:99.95 (mol/mol), were used as nanophase reactors for the in situ generation of size-quantized CdS and ZnS particles. The semiconductor particles were generated by the addition of H2S to silica particle dispersions which contained different concentrations of Cd2+ or Zn2+. The smallest semiconductor particles were generated in dispersions which contained the least amount of precursors. Absorption spectrophotometry, small-angle X-ray scattering, rheological, and calorimetric measurements were used to characterize the dispersions. The presence of semiconductor particles increased the viscosities and decreased the immersion wetting enthalpies of the silica dispersions, indicating strong interparticle interactions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of CdS and ZnS Particles in Nanophase Reactors Provided by Binary Liquids Adsorbed at Colloidal Silica Particles

Dékány¹,

Nagy²,

Túri³

et al. 1996

Langmuir

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“…A particularly good example is the nanometer-scale analysis of noble metal surfaces, where there exist well-defined relationships between surface morphology and bulk physical properties. For instance, surface-enhanced Raman scattering (SERS) 16 depends critically on the nanometer-level details of Ag, Au, or Cu surface topography, and there have been numerous studies describing the nanostructure of thin-film substrates designed for SERS. − More generally, continuous and discontinuous Au or Ag films have been characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), − scanning tunneling microscopy (STM) 26 and photon STM, atomic force microscopy (AFM), and near-field scanning optical microscopy (NSOM) . These studies have afforded a morphological description of continuous Au and Ag thin films prepared by a variety of methods.…”

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Nanoscale Characterization of Gold Colloid Monolayers: A Comparison of Four Techniques

et al. 1997

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Atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and near-field scanning optical microscopy (NSOM) have been used to characterize the nanostructure of Au colloid-based surfaces. Because these substrates are composed of particles whose dimensions are known prior to assembly, they are well-suited for a critical comparison of the capabilities and limitations of each nanoscale imaging technique. The three criteria for this comparison, which are relevant to the field of nanoparticle assemblies in general, are (i) accuracy in establishing particle size, particle coverage, and interparticle spacing; (ii) accuracy in delineating surface topography; and (iii) ease of sample preparation, data acquisition, and image analysis. For colloidal Au arrays, TEM gives the most reliable size and spacing information but exhibits the greatest constraints with regard to sample preparation; in contrast, AFM is widely applicable but yields data that are the least straightforward to interpret. For accurate information regarding nanometer-scale architecture of particle-based surfaces, a combination of at least one scanning probe method (AFM, NSOM) and one accelerated-electron method (TEM, FE-SEM) is required.

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“…410 nm, a resonate frequency very close to that observed for Ag/silica xerogel nanocomposite 1c , as expected due to the similarity of the host matrixes. Silver nanoclusters supported in other solid host matrixes give surface plasmon maxima from 440 to 458 nm. − Line width measurements of the surface plasmon resonance for the silver/silica xerogel nanocomposite prepared using a Si/Ag stoichiometry of 11/1 give a calculated average silver particle size of 14 nm 36b…”

Section: Resultsmentioning

confidence: 99%

“…Silver nanoclusters supported in other solid host matrixes give surface plasmon maxima from 440 to 458 nm. [45][46][47] Line width measurements of the surface plasmon resonance for the silver/silica xerogel nanocomposite prepared using a Si/Ag stoichiometry of 11/1 give a calculated average silver particle size of 14 nm. 36b This value is in reasonable agreement with that determined by XRD nm).…”

Section: Resultsmentioning

confidence: 99%

Formation of Crystalline Nanoclusters of Ag, Cu, Os, Pd, Pt, Re, or Ru in a Silica Xerogel Matrix from Single-Source Molecular Precursors

Carpenter¹,

Lukehart²,

Milne³

et al. 1997

Chem. Mater.

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Metal complexes containing bifunctional ligands which possess alkoxysilyl functional groups have been prepared for seven metals of the first, second, or third transition metal series. Incorporation of these single-source precursors into silica xerogel matrixes using sol−gel chemistry affords molecularly doped xerogels. Subsequent thermal treatment of these doped xerogels under reducing or oxidizing-then-reducing conditions affords nanoclusters of Ag, Cu, Os, Pd, Pt, Re, or Ru which are highly dispersed throughout the bulk of the xerogel matrix. Characterization of these nanocomposite materials by TEM, EDS, XRD, and electron diffraction indicates that the metal nanoclusters are highly crystalline. A visible spectrum of the silver nanocomposite shows the expected surface plasmon resonance near 415 nm.

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Dispersion and Optical Absorption of Au and Ag Particles Supported on an Amorphous SiO2 Substrate

Cited by 13 publications

References 0 publications

Preparation and Characterization of CdS and ZnS Particles in Nanophase Reactors Provided by Binary Liquids Adsorbed at Colloidal Silica Particles

Preparation and Characterization of CdS and ZnS Particles in Nanophase Reactors Provided by Binary Liquids Adsorbed at Colloidal Silica Particles

Nanoscale Characterization of Gold Colloid Monolayers: A Comparison of Four Techniques

Formation of Crystalline Nanoclusters of Ag, Cu, Os, Pd, Pt, Re, or Ru in a Silica Xerogel Matrix from Single-Source Molecular Precursors

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