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Size- and Surface-dependent Photoresistance in SnO2 Nanowires

Published online by Cambridge University Press:  26 February 2011

Sanjay Mathur ,
Sven Barth ,
Jae-Chul Pyun  and
Hao Shen
Sanjay Mathur
Affiliation:
smathur@inm-gmbh.de, Leibniz-Institute of New Materials, Nanokrystalline Materials and Thin Film Systems, Im Stadtwald, Gebaeude D2 2, Saarbrücken, Saarland, 66041, Germany, +49 681 9300 279
Sven Barth
Affiliation:
barth@inm-gmbh.de, Leibniz-Institute of New Materials, Nanocrystalline Materials and Thin Film Systems, Germany
Jae-Chul Pyun
Affiliation:
pyun@kist-europe.de, Korea Institute of Science and Technology (KIST) Europe Forschungsgesellschaft mbH
Hao Shen
Affiliation:
Shen@inm-gmbh.de, Leibniz-Institute of New Materials, Nanocrystalline Materials and Thin Film Systems
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Abstract

Nanostructured one-dimensional materials, such as nanowires, tubes and rods, are gaining increasing attention due to interesting properties and confinement effects, however controlled synthesis of these structures is still limited to a few methods. We present here the synthesis of SnO2 nanowires (Ø, 50 – 1000 nm) at moderate temperatures (550 – 900 °C) using a molecular source [Sn(OBut)4] with pre-existent Sn-O bonds. The growth occurs via a catalyst driven vapor-solid-solid mechanism. Size-selective synthesis of NWs in high areal density was achieved by choosing Au particles of appropriate size. HR-TEM analysis reveals the single crystalline behaviour of wires with a preferred growth direction [100]. Use of SnO2 nanowires as potential optical switches for UV applications was demonstrated by the photo-response measurements. Determination of band gap values confirmed the blue-shift of the main photo-response peak with shrinking radial dimensions of the wires. Furthermore, deposition of vanadium oxide onto SnO2 led to a red-shift of the main conduction value of the nanowires.

Keywords

chemical vapor deposition (CVD) (deposition)semiconductingfiber
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 901: Symposium R – Assembly at the Nanoscale – Toward Functional Nanostructured Materials , 2005 , 0901-Rb15-02
Copyright
Copyright © Materials Research Society 2006

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