Voids, nanochannels and formation of nanotubes with mobile Sn fillings in Sn doped ZnO nanorods

被引：10

作者：

Ortega, Y. ^{[1
,2
]}

Dieker, Ch ^{[1
]}

Jaeger, W. ^{[1
]}

Piqueras, J. ^{[2
]}

Fernandez, P. ^{[2
]}

机构：

[1] Univ Kiel, Inst Mat Sci, D-24143 Kiel, Germany

[2] Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Mat, E-28040 Madrid, Spain

来源：

NANOTECHNOLOGY | 2010年 / 21卷 / 22期

关键词：

CORE-SHELL NANOWIRES; FABRICATION;

D O I：

10.1088/0957-4484/21/22/225604

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

ZnO nanorods containing different hollow structures have been grown by a thermal evaporation-deposition method with a mixture of ZnS and SnO2 powders as precursor. Transmission electron microscopy shows rods with rows of voids as well as rods with empty channels along the growth axis. The presence of Sn nanoprecipitates associated with the empty regions indicates, in addition, that these are generated by diffusion processes during growth, probably due to an inhomogeneous distribution of Sn. The mechanism of forming voids and precipitates appears to be based on diffusion processes similar to the Kirkendall effect, which can lead to void formation at interfaces of bulk materials or in core-shell nanostructures. In some cases the nanorods are ZnO tubes partially filled with Sn that has been found to melt and expand by heating the nanotubes under the microscope electron beam. Such metal-semiconductor nanostructures have potential applications as thermal nanosensors or as electrical nanocomponents.

引用

页数：7

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