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Morphology Transition of ZnO Nanorod Arrays Synthesized by a Two-Step Aqueous Solution Method
Open AccessArticle

Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure

NIS (Nanostructured Interfaces and Surfaces) Inter-Departmental Centre, University of Torino, Via P. Giuria 7, Consorzio INSTM (UdR of Torino), I-10125 Torino, Italy
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Crystals 2018, 8(4), 153; https://doi.org/10.3390/cryst8040153
Received: 1 March 2018 / Revised: 14 March 2018 / Accepted: 28 March 2018 / Published: 30 March 2018
(This article belongs to the Collection Nanocrystals)
Tailor-made nanostructured ZnO cages have been catalytically grown on Au and Pt films covering silicon substrates, by a controlled evaporation process, which means an accurate choice of temperatures, times, gas flows (He in the heating, He/air during the synthesis), and Au/Pt film thickness. The effect of the process parameters affecting the morphology and the structure of the obtained materials has been investigated by XRD analysis, scanning electron microscopy (SEM) and atomic force microscopy (AFM) microscopies, and FTIR spectroscopies. In particular, the role of the synthesis temperature in affecting the size and shape of the obtained ZnO cages has been highlighted. It will be shown that by adopting higher temperatures, the protruding nanowhiskers several microns in length, covering the cages and exhibiting both basal and prismatic faces, change into very thin and narrow structures, with extended prismatic faces, prevailing with respect to the basal ones. At an even higher process temperature, the building up of Au particles aggregates inside and/or anchored to the walls of the hollow cages, without any evidence of elongated ZnO nanostructures will be highlighted. From FTIR spectra information on lattice modes of the investigated ZnO, materials have been obtained. View Full-Text
Keywords: ZnO; hierarchical nanostructures; ZnO nanowhiskers; ZnO hollow microspheres; thermal oxidation; Au catalyst; Pt catalyst; SEM; AFM; XRD; FTIR spectroscopy ZnO; hierarchical nanostructures; ZnO nanowhiskers; ZnO hollow microspheres; thermal oxidation; Au catalyst; Pt catalyst; SEM; AFM; XRD; FTIR spectroscopy
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MDPI and ACS Style

Scarano, D.; Cesano, F.; Bertarione, S.; Zecchina, A. Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure. Crystals 2018, 8, 153.

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