http://www.cnr.it/ontology/cnr/individuo/prodotto/ID281651
Hollow and Concave Nanoparticles via Preferential Oxidation of the Core in Colloidal Core/Shell Nanocrystals (Articolo in rivista)
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- Hollow and Concave Nanoparticles via Preferential Oxidation of the Core in Colloidal Core/Shell Nanocrystals (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/ja5032634 (literal)
- Alternative label
Miszta, Karol; Brescia, Rosaria; Prato, Mirko; Bertoni, Giovanni; Marras, Sergio; Xie, Yi; Ghosh, Sandeep; Kim, Mee Rahn; Manna, Liberato (2014)
Hollow and Concave Nanoparticles via Preferential Oxidation of the Core in Colloidal Core/Shell Nanocrystals
in Journal of the American Chemical Society (Print); ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Miszta, Karol; Brescia, Rosaria; Prato, Mirko; Bertoni, Giovanni; Marras, Sergio; Xie, Yi; Ghosh, Sandeep; Kim, Mee Rahn; Manna, Liberato (literal)
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- http://pubs.acs.org/doi/abs/10.1021/ja5032634 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
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- Department of Nanochemistry, Istituto Italiano di Tecnologia (IIT), via Morego 30, 16163 Genova, Italy; IMEM-CNR, Parco Area delle Scienze 37/A, 43124 Parma, Italy (literal)
- Titolo
- Hollow and Concave Nanoparticles via Preferential Oxidation of the Core in Colloidal Core/Shell Nanocrystals (literal)
- Abstract
- Hollow and concave nanocrystals find applications in many fields, and their fabrication can follow different possible mechanisms. We report a new route to these nanostructures that exploits the oxidation of Cu2-xSe/Cu2-xS core/shell nanocrystals with various etchants. Even though the Cu2-xSe core is encased in a thick Cu2-xS shell, the initial effect of oxidation is the creation of a void in the core. This is rationalized in terms of diffusion of Cu+ ions and electrons from the core to the shell (and from there to the solution). Differently from the classical Kirkendall effect, which entails an imbalance between in-diffusion and out-diffusion of two different species across an interface, the present mechanism can be considered as a limiting case of such effect and is triggered by the stronger tendency of Cu2-xSe over Cu2-xS toward oxidation and by fast Cu+ diffusion in copper chalcogenides. As the oxidation progresses, expansion of the inner void erodes the entire Cu2-xSe core, accompanied by etching and partial collapse of the shell, yielding Cu2-xSySe1-y concave particles. (literal)
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