Universität zu Köln

Vomiero, Alberto, Ferroni, Matteo ORCID: 0000-0002-4231-9162, Natile, Marta Maria ORCID: 0000-0001-5591-2670, Fischer, Thomas, Fiz, Raquel, Mathur, Sanjay and Sberveglieri, Giorgio ORCID: 0000-0003-0080-8117 (2014). Sequential physical vapor deposition and chemical vapor deposition for the growth of In2O3-SnO2 radial and longitudinal heterojunctions. Appl. Surf. Sci., 323. S. 59 - 65. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1873-5584

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Abstract

Heterostructures of In2O3 and SnO2 were produced by sequential application of the physical- and chemical-vapor deposition techniques usually adopted for nanowire fabrication. In2O3 nanowires exhibit a single crystal body-centered cubic structure oriented along the [1 0 0] direction and grow epitaxially on alpha-sapphire substrate by means of a transport and condensation method assisted by Au nanoparticles. Nucleation and growth occurred via direct vapor solid (VS) mechanism competing with catalyst-mediated vapor-liquid-solid (VLS). SnO2 nanowires were obtained in a single crystal tetragonal (cassiterite) structure and oriented along the [1 0 1] direction, the growth being promoted by the gold particle at the apex of the In2O3 nanowires. The size of the catalyst thereby determines the main morphological features of SnO2 wires. CVD deposition allows precise control of the geometrical features of the heterojunction, also limiting detrimental nucleation of SnO2 on the lateral sides of In2O3 nanowires due to lower longitudinal growth rate. These results can help in improving the ability of finely tuning the morphological and structural properties of heterostructured oxide nanocrystals. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vomiero, Alberto UNSPECIFIED UNSPECIFIED UNSPECIFIED Ferroni, Matteo UNSPECIFIED orcid.org/0000-0002-4231-9162 UNSPECIFIED Natile, Marta Maria UNSPECIFIED orcid.org/0000-0001-5591-2670 UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Fiz, Raquel UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Sberveglieri, Giorgio UNSPECIFIED orcid.org/0000-0003-0080-8117 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-419948
DOI:	10.1016/j.apsusc.2014.07.177
Journal or Publication Title:	Appl. Surf. Sci.
Volume:	323
Page Range:	S. 59 - 65
Date:	2014
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1873-5584
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TIN OXIDE NANOWIRES; EPITAXIAL-GROWTH; NANOSTRUCTURES; NUCLEATION; MECHANISM; ARRAYS; FILMS; SNO2 Multiple languages Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/41994