http://www.cnr.it/ontology/cnr/individuo/prodotto/ID192655
Functionalization of ZnO Nanostructures by CdS Nanoparticles: Effects on Functional Properties (Comunicazione a convegno)
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- Label
- Functionalization of ZnO Nanostructures by CdS Nanoparticles: Effects on Functional Properties (Comunicazione a convegno) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Alternative label
Calestani Davide, Villani Marco, Lazzarini Laura, Mosca Roberto, Zappettini Andrea (2011)
Functionalization of ZnO Nanostructures by CdS Nanoparticles: Effects on Functional Properties
in MRS Fall Meeting 2011, Boston, USA, 28/11/2011-02/12/2011
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Calestani Davide, Villani Marco, Lazzarini Laura, Mosca Roberto, Zappettini Andrea (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- IMEM-CNR, Parma, Italy (literal)
- Titolo
- Functionalization of ZnO Nanostructures by CdS Nanoparticles: Effects on Functional Properties (literal)
- Abstract
- Zinc oxide (ZnO) nanostructures are today one of the most studied topic in materials science and the research about all the possible synthesis method for these unique and versatile nanocrystals is still growing exponentially. Indeed, ZnO is not only very important for its optical and semiconducting properties, but it has also a polar crystal structure and piezoelectric properties, it is a good transparent conducting oxide for photovoltaic applications and high temperature and radiation resistant circuits. Moreover it is a good n-type gas-sensing material and photocatalyst and, in addition, it is used for cantilevers production and for the preparation of diluted- and ferro-magnetic materials for semiconductor spintronics. But, above all, the enormous potentiality of this material rises from the possibility to combine all these application fields with the large variety of available ZnO nanostructures and the nearly infinite number of possible surface functionalizations by different materials.
Authors previously reported about the vapor phase synthesis of different ZnO nanostructures. The growth of specific morphologies have been optimized, stabilized and then coupled with different vapor and solution based techniques for adding different functionalizing materials (metal colloidal nanoparticles, organic molecules and inorganic materials,...). Among them, a detailed study on cadmium sulphide (CdS) deposition over ZnO nanorods and tetrapods is here reported.
At first, a focused optimization of CdS synthesis process have been faced in order to avoid the typical damaging of ZnO surfaces in alkaline solutions, that are generally used for the synthesis of calcogenide nanostructures.
Then fundamental and functional characterizations, such as scanning and transmission electron microscopy, x-ray diffraction, photoluminescence, photo-induced currents, photocatalytic activity and gas sensing properties, have been performed in order to study the effects of materials coupling on ZnO chemical and physical properties. In particular, some evidence of excitonic charge transfer and a selective inversion of the response towards specific gases in the obtained CdS-functionalized ZnO nanostructures have been observed and discussed. (literal)
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