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Open Access NANO EXPRESS

Preferential Growth of Semiconducting Single-Walled Carbon Nanotubes on Substrate by Europium Oxide

Yong Qian1*, Bin Huang1, Fenglei Gao2, Chunyan Wang1 and Guangyuan Ren1

Author Affiliations

1 Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense, Department of Materials Science and Engineering, East China Institute of Technology, 344000, Fuzhou, China

2 College of Chemistry and Materials Engineering, Wenzhou University, 325027, Wenzhou, People’s Republic of China

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Nanoscale Research Letters 2010, 5:1578-1584  doi:10.1007/s11671-010-9679-x

Published: 18 July 2010

Abstract

In this paper, we have demonstrated that europium oxide (Eu2O3) is a new type of active catalyst for single-walled carbon nanotubes (SWNTs) growth under suitable conditions. Both random SWNT networks and horizontally aligned SWNT arrays are efficiently grown on silicon wafers. The density of the SWNT arrays can be altered by the CVD conditions. This result further provides the experimental evidence that the efficient catalyst for SWNT growth is more size dependent than the catalysts themselves. Furthermore, the SWNTs from europium sesquioxides have compatibly higher quality than that from Fe/Mo catalyst. More importantly, over 80% of the nanotubes from Eu2O3 are semiconducting SWNTs (s-SWNTs), indicating the preferential growth of s-SWNTs from Eu2O3. This new finding could open a way for selective growth of s-SWNTs, which can be used as high-current nanoFETs and sensors. Moreover, the successful growth of SWNTs by Eu2O3 catalyst provides new experimental information for understanding the preferential growth of s-SWNTs from Eu2O3, which may be helpful for their controllable synthesis.

Keywords:
Preferential growth; Semiconducting single-walled carbon nanotubes; Europium oxide