The challenge for large-scale vapor-phase growths of not-catalyzed ZnO nanostructures: purity vs. yield (Articolo in rivista)

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  • The challenge for large-scale vapor-phase growths of not-catalyzed ZnO nanostructures: purity vs. yield (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Calestani D.; Zha M.; Mosca R.; Lazzarini L.; Salviati G.; Zappettini A.; Zanotti L. (2009)
    The challenge for large-scale vapor-phase growths of not-catalyzed ZnO nanostructures: purity vs. yield
    in Materials Research Society symposia proceedings
    (literal)
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  • Calestani D.; Zha M.; Mosca R.; Lazzarini L.; Salviati G.; Zappettini A.; Zanotti L. (literal)
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  • 1174 (literal)
Rivista
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  • In: Materials Research Society Symposia Proceedings, vol. 1174 article n. 1174-V05-02. Materials Research Society, 2009. In: MRS Spring Meeting 2009 (San Francisco (U.S.A.), 13-17 Aprile 2009). Abstract, article n. V05-02. Materials Research Society, 2009. (literal)
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  • ZnO nanostructures are today a very important research topic because their proved (or even just \"potential\") properties promoted huge studies in many different application fields, such as optoelectronics, photovoltaics, spintronics, gas sensing, photocatalysis, piezo-electric applications, etc. Since a reproducible large-scale production is essential for a likely use of these nanostructures in any industrial application, large efforts have been done to control and stabilize their synthesis processes. Good results have been obtained in vapor phase growths of nanorods and nanowires, by mean of metal catalysts (such as Au, Pt or Ni particles). On the other side, large and controlled production of some ZnO nanostructures have been realized by wet chemical processes. Unfortunately both these approaches are intrinsically affected by the introduction of impurities in the nanocrystals' structure. Indeed, even very low impurity levels may have a strong effect on the physical properties of these semiconducting nanostructures. Catalyst-free vapor-phase growth techniques should not be affected by the same impurity levels if high purity sources and gases are employed. Unfortunately, the synthesis control is generally more difficult in this kind of processes. In the present work authors show the results obtained in the optimization of three different growth processes, for a large-scale oriented production of (i) ZnO tetrapods, (ii) ZnO nanorods and (iii) ZnO long nanowires. All the described processes share a catalyst-free growth and the use of high purity metallic Zn, O2 and inert carrier gas (Ar) only. The properties of the obtained ZnO nanostructures have been characterized and, hence, pros and cons of the used approach have been discussed. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • CNR-IMEM, Parma (literal)
Titolo
  • The challenge for large-scale vapor-phase growths of not-catalyzed ZnO nanostructures: purity vs. yield (literal)
Abstract
  • Large-scale growth capability is a general requirement for any reliable and cost-effective device application. Catalyst-free vapor-phase growth techniques generally let obtain high purity materials, but their application in large-scale growths of zinc oxide (ZnO) nanostructures is not trivial, because the lack of catalysts makes the control of these process rather difficult. Three different optimizations of the basic vapor phase growth have been studied and performed to obtain selected and reproducible growths of three different ZnO nanostructures with improved yield, i.e. nanotetrapods, nanowires and nanorods. No precursor or catalyst has been used in order to reduce contamination sources as more as possible. (literal)
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