Gold colloids properties

Wilcoxon J P, Williamson R L and Baughman R 1993 Optical properties of gold colloids formed in inverse micelles J. Chem. Phys. 98 9933... 

Duff, D.G. and Baiker, A., Preparation and structural properties of ultrafine gold colloids for oxidation catalysis, in Preparation of Catalysts VI, Poncelet, G., Martens, J., Delmon, B., Jacobs, P.A., and Grange, P., Eds., Elsevier, Amsterdam, 1995, p. 505. 

Wilcoxon JP, Williamson RL, Baughman R (1993) Optical-Properties of Gold Colloids Formed in Inverse Micelles. J Chem Phys 98 9933-9950... 

Stable colloidal forms of nanocomposites protected with the polymer 12a have been recently synthesized (Scheme 5) [75]. Gold colloidal particles were formed with narrow size distribution (average size 6 nm) via reduction of HAuCLt by 12a due to its electron donating property. The oxidized polymer then protected and stabilized the gold nanoparticles which were stable in... 

While the chemical properties of GNPs were first studied by Faraday, the main application of gold colloids in the biomedical field has been related to their electronic and optical properties [8, 9]. At present, there are many synthetic routes to... 

A short laser pulse ( 200 fs) generates hot electrons in the metal clusters. A second laser pulse monitors the hot electron population. This technique enables the direct observation of electron relaxation as a result of electron-phonon coupling. Electron-phonon coupling is a decisive property enabling differentiation between bulk and molecular properties. Although this possibility has been exploited by different authors, the particles used have not been single-sized, which is necessary if valid results are to be obtained. The use of clusters of a distinct size such as Aun and Auss" and almost monodisperse 15-nm gold colloids and 3 nm and 35 nm Pt particles recently enabled more precise measurements to be made and better results to be obtained than in the past. It could be shown that the hot electron relaxation depends on the particle size in two different ways ... 

That the optical properties of such 2D/3D colloid arrays will depend on particle packing densities has been demonstrated by Dusemund et al., who measured the reflectivity of gold colloid films as a function of colloid volume fraction [47]. Although the films were not ordered they showed a clear shift in surface plasmon position with increasing particle volume fraction. The only compromise was that the volume fraction could not be directly determined on the samples from which spectra were taken, but had to be measured on separately prepared TEM grids. Several groups have found that clustered quantum dots exhibit red-shifted fluorescence, a question recently reviewed by Weller [48]. 

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