Controlled Growth of Supported ZnO Inverted Nanopyramids with Downward Pointing Tips

Davide Barreca, Giorgio Carraro, Chiara Maccato, Thomas Altantzis, Kimmo Kaunisto, Alberto Gasparotto

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)


    High purity porous ZnO nanopyramids with controllable properties are grown on their tips on Si(100) substrates by means of a catalyst-free vapor phase deposition route in a wet oxygen reaction environment. The system degree of preferential [001] orientation, as well as nanopyramid size, geometrical shape, and density distribution, can be finely tuned by varying the growth temperature between 300 and 400°C, whereas higher temperatures lead to more compact systems with a three-dimensional (3D) morphology. A growth mechanism of the obtained ZnO nanostructures based on a self-catalytic vapor-solid (VS) mode is proposed, in order to explain the evolution of nanostructure morphologies as a function of the adopted process conditions. The results obtained by a thorough chemico-physical characterization enable us to get an improved control over the properties of ZnO nanopyramids grown by this technique. Taken together, they are of noticeable importance not only for fundamental research on ZnO nanomaterials with controlled nano-organization but also to tailor ZnO functionalities in view of various potential applications.
    Original languageEnglish
    Pages (from-to)2579-2587
    JournalCrystal Growth and Design
    Issue number4
    Publication statusPublished - 4 Apr 2018
    MoE publication typeA1 Journal article-refereed


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