Hierarchically structured nanowires on and nanosticks in ZnO microtubes

We report both coaxial core-shell structured microwires and ZnO microtubes with growth of nanosticks in the inner and nanowires on the outer surface as a novel hierarchical micro/nanoarchitecture. First, a core-shell structure is obtained—the core is formed by metallic Zn and the semiconducting shel...

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Main Authors:	Rivaldo-Gómez, C. M., Cabrera-Pasca, G. A., Zúñiga, A., Carbonari, A. W., Souza, J. A.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4601030/

id	pubmed-4601030
recordtype	oai_dc
spelling	pubmed-46010302015-10-21 Hierarchically structured nanowires on and nanosticks in ZnO microtubes Rivaldo-Gómez, C. M. Cabrera-Pasca, G. A. Zúñiga, A. Carbonari, A. W. Souza, J. A. Article We report both coaxial core-shell structured microwires and ZnO microtubes with growth of nanosticks in the inner and nanowires on the outer surface as a novel hierarchical micro/nanoarchitecture. First, a core-shell structure is obtained—the core is formed by metallic Zn and the semiconducting shell is comprised by a thin oxide layer covered with a high density of nanowires. Such Zn/ZnO core-shell array showed magnetoresistance effect. It is suggested that magnetic moments in the nanostructured shell superimposes to the external magnetic field enhancing the MR effect. Second, microtubes decorated with nanowires on the external surface are obtained. In an intermediate stage, a hierarchical morphology comprised of discrete nanosticks in the inner surface of the microtube has been found. Hyperfine interaction measurements disclosed the presence of confined metallic Zn regions at the interface between linked ZnO grains forming a chain and a ZnO thicker layer. Surprisingly, the metallic clusters form highly textured thin flat regions oriented parallel to the surface of the microtube as revealed by the electrical field gradient direction. The driving force to grow the internal nanosticks has been ascribed to stress-induced migration of Zn ions due to compressive stress caused by the presence of these confined regions. Nature Publishing Group 2015-10-12 /pmc/articles/PMC4601030/ /pubmed/26456527 http://dx.doi.org/10.1038/srep15128 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Rivaldo-Gómez, C. M. Cabrera-Pasca, G. A. Zúñiga, A. Carbonari, A. W. Souza, J. A.
spellingShingle	Rivaldo-Gómez, C. M. Cabrera-Pasca, G. A. Zúñiga, A. Carbonari, A. W. Souza, J. A. Hierarchically structured nanowires on and nanosticks in ZnO microtubes
author_facet	Rivaldo-Gómez, C. M. Cabrera-Pasca, G. A. Zúñiga, A. Carbonari, A. W. Souza, J. A.
author_sort	Rivaldo-Gómez, C. M.
title	Hierarchically structured nanowires on and nanosticks in ZnO microtubes
title_short	Hierarchically structured nanowires on and nanosticks in ZnO microtubes
title_full	Hierarchically structured nanowires on and nanosticks in ZnO microtubes
title_fullStr	Hierarchically structured nanowires on and nanosticks in ZnO microtubes
title_full_unstemmed	Hierarchically structured nanowires on and nanosticks in ZnO microtubes
title_sort	hierarchically structured nanowires on and nanosticks in zno microtubes
description	We report both coaxial core-shell structured microwires and ZnO microtubes with growth of nanosticks in the inner and nanowires on the outer surface as a novel hierarchical micro/nanoarchitecture. First, a core-shell structure is obtained—the core is formed by metallic Zn and the semiconducting shell is comprised by a thin oxide layer covered with a high density of nanowires. Such Zn/ZnO core-shell array showed magnetoresistance effect. It is suggested that magnetic moments in the nanostructured shell superimposes to the external magnetic field enhancing the MR effect. Second, microtubes decorated with nanowires on the external surface are obtained. In an intermediate stage, a hierarchical morphology comprised of discrete nanosticks in the inner surface of the microtube has been found. Hyperfine interaction measurements disclosed the presence of confined metallic Zn regions at the interface between linked ZnO grains forming a chain and a ZnO thicker layer. Surprisingly, the metallic clusters form highly textured thin flat regions oriented parallel to the surface of the microtube as revealed by the electrical field gradient direction. The driving force to grow the internal nanosticks has been ascribed to stress-induced migration of Zn ions due to compressive stress caused by the presence of these confined regions.
publisher	Nature Publishing Group
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4601030/
_version_	1613486366416437248

Hierarchically structured nanowires on and nanosticks in ZnO microtubes

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