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Your search keyword '"Oviedo, O.A."' showing total 3 results
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3 results on '"Oviedo, O.A."'

1. Thermodynamic stability of electrochemically decorated Au–Pd core@shell nanoparticles

Author

Oviedo, O.A., Reinaudi, L., Mariscal, M.M., and Leiva, E.P.M.

Subjects
*THERMODYNAMICS, *CHEMICAL stability, *ELECTROCHEMICAL analysis, *COLLOIDAL gold, *PALLADIUM alloys, *MECHANICAL properties of metals, *PARTICLE size distribution
Abstract

Abstract: The electrochemical decoration of Au and Pd nanoparticles by Pd and Au atoms respectively is discussed in a statistical mechanical framework. It is found that depending on precursor nanoparticle size and shape, controlled decoration may be achieved in undersaturation or oversaturation conditions. Multilayer deposition is also considered, with the finding that this phenomenon is also size dependent. [Copyright &y& Elsevier]

Published
2012
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2. The limits of underpotential deposition in the nanoscale

Author

Oviedo, O.A., Reinaudi, L., and Leiva, E.P.M.

Subjects
*ADATOMS, *THERMODYNAMICS, *NANOPARTICLES, *BINDING energy, *SUBSTRATES (Materials science), *PHYSICAL & theoretical chemistry
Abstract

Abstract: A thermodynamic model predicting the disappearance of the underpotential deposition phenomenon in the limit of small nanoparticles is proposed and developed for selected families of geometric bodies. The key parameters are the binding energy of adatoms on the flat foreign substrate and at the edges of the nanoparticle. [Copyright &y& Elsevier]

Published
2012
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3. Underpotential deposition on free nanoparticles: Its meaning and measurement

Author

Oviedo, O.A., Negre, C.F.A., Mariscal, M.M., Sánchez, C.G., and Leiva, E.P.M.

Subjects
*NANOPARTICLES, *MEASUREMENT errors, *OXIDATION-reduction reaction, *MONTE Carlo method, *SIMULATION methods & models, *MONOMOLECULAR films, *PLASMONS (Physics), *QUANTUM theory
Abstract

Abstract: The meaning of underpotential shift is discussed for free nanoparticles, where a redox couple is used to set potential control on them. Atomistic Monte Carlo simulations are performed to study their decoration in the submonolayer regime. The resulting configurations are used to simulate their plasmon spectra by means of a state-of-the art quantum mechanical atomistic model. [Copyright &y& Elsevier]

Published
2012
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