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Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures
Published on: July 2, 2012
Growth of semiconducting single-walled carbon nanotubes by using ceria as catalyst supports
Xiaojun Qin1, Fei Peng, Feng Yang
1Key Laboratory for the Physics and Chemistry of Nanodevices, ‡Beijing National Laboratory for Molecular Science, College of Chemistry and Molecular Engineering, and §State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University , Beijing 100871, China.
Abstract:
The growth of semiconducting single-walled carbon nanotubes (s-SWNTs) on flat substrates is essential for the application of SWNTs in electronic and optoelectronic devices. We developed a flexible strategy to selectively grow s-SWNTs on silicon substrates using a ceria-supported iron or cobalt catalysts. Ceria, which stores active oxygen, plays a crucial role in the selective growth process by inhibiting the formation of metallic SWNTs via oxidation. The so-produced ultralong s-SWNT arrays are immediately ready for building field effect transistors.
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