Universität zu Köln

Mueller, Ralf, Hernandez-Ramirez, Francisco ORCID: 0000-0002-2690-947X, Shen, Hao ORCID: 0000-0001-5098-7948, Du, Hongchu ORCID: 0000-0002-4661-4644, Mader, Werner and Mathur, Sanjay (2012). Influence of Precursor Chemistry on Morphology and Composition of CVD-Grown SnO2 Nanowires. Chem. Mat., 24 (21). S. 4028 - 4036. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-5002

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Abstract

Tin oxide (SnO2) nanowires (NWs) were synthesized via the gold-catalyzed chemical vapor deposition of tin(IV) and tin(II) precursors, namely, [Sn((OBu)-Bu-t)(4)] (1) and [Sn((OBu)-Bu-t)(2)](2) (2). Nanowires were deposited on gold-coated Si(001) substrates, following the vapor-liquid-solid mechanism. Energy-dispersive X-ray (EDX) analysis and high-resolution transmission electron microscopy (HR-TEM) measurements on individual nanostructures showed that the change in tin valence from +IV to +II has significant influence on the morphology and composition of the resulting NWs. Whereas 1 led directly to the growth of SnO2 nanowires, 2 underwent a disproportionation reaction whereby the elemental phase (Sn-0) reacted with Au nanoparticles to form a Au-Sn intermetallic catalyst. Comparative analysis of gas-sensing behaviors of nanowires grown from 1 and 2 illustrated that crystallographic imperfections, such as oxygen deficiency and a change in the oxidation states of the cations, are subject to the precursor configurations (Sn:O ratio in 1 and 2) and can significantly alter the surface properties, such as transduction behavior and electronic transport, that are responsible for their sensitivity toward analyte gases.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mueller, Ralf UNSPECIFIED UNSPECIFIED UNSPECIFIED Hernandez-Ramirez, Francisco UNSPECIFIED orcid.org/0000-0002-2690-947X UNSPECIFIED Shen, Hao UNSPECIFIED orcid.org/0000-0001-5098-7948 UNSPECIFIED Du, Hongchu UNSPECIFIED orcid.org/0000-0002-4661-4644 UNSPECIFIED Mader, Werner UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-478965
DOI:	10.1021/cm300913h
Journal or Publication Title:	Chem. Mat.
Volume:	24
Number:	21
Page Range:	S. 4028 - 4036
Date:	2012
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-5002
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NO2 SENSING PROPERTIES; GRAIN-SIZE CONTROL; NANOSTRUCTURES; FABRICATION; DEFECT Multiple languages Chemistry, Physical; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47896