Size dependence of the dissolution of ZnO nanoparticles

Article Abstract:

Zinc oxide nanoparticles with initial sizes ranging from 30 to 60 angstroms in ethanolic solution were etched by addition of anhydrous acetic acid. The volume-weighted particle size decreased by about 10% after dissolution. Polydispersity was observed to increase slightly. The dissolution rate was strongly dependent on particle size. Size selective etching of a mixture of ZnO particles was also demonstrated. The change of particle size can be modeled adequately by a Monte Carlo simulation, suggesting that dissolution can be conveniently used to study size-dependent chemical properties.

Zinc oxide, Etching reagents, Etchants

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Size and temperature dependence of the plasmon absorption of colloidal gold nanoparticles

Article Abstract:

The size and temperature dependence of the plasmon absorption was investigated for 9, 15, 22, 48 and 99 nm gold nanoparticles in aqueous solution. The plasmon bandwidth was observed to follow the expected behavior as it increases with decreasing size in the intrinsic size region, and also increases with increasing size in the extrinsic region. A homogeneous size distribution and, therefore, a homogeneous widening of the plasmon band is concluded for all the prepared gold nanoparticle samples.

Gold, Colloids, Plasmons (Physics)

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Size control of monodispersed Pt nanoparticles and their 2D organization by electrophoretic deposition

Article Abstract:

A study was conducted to analyze a method of controlling the size of platinum nanoparticles using an alcohol reduction. The mean diameter of the monodispersed platinum nanoparticles was controlled in a one-step reaction. Results indicated that the particle diameter decreases linearly with concentration of alcohol in water. Findings also showed that increasing the amount of PVP decreases the size of the platinum nanoparticles.

Platinum, Alcohol, Ethanol, Particles, Particulate matter

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