Growth Mechanism of Single-Walled Carbon Nanotubes on Iron鈥揅opper Catalyst and Chirality Studies by Electron Diffraction
详细信息 查看全文
- 作者：Maoshuai He ; Bilu Liu ; Alexander I. Chernov ; Elena D. Obraztsova ; Inkeri Kauppi ; Hua Jiang ; Ilya Anoshkin ; Filippo Cavalca ; Thomas W. Hansen ; Jakob B. Wagner ; Albert. G. Nasibulin ; Esko I. Kauppinen ; Juha Linnekoski ; Marita Niemel盲 ; Juha Lehtonen
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：May 22, 2012
- 年：2012
- 卷：24
- 期：10
- 页码：1796-1801
- 全文大小：405K
- 年卷期：v.24,no.10(May 22, 2012)
- ISSN：1520-5002
文摘
Chiralities of single-walled carbon nanotubes grown on an atomic layer deposition prepared bimetallic FeCu/MgO catalyst were evaluated quantitatively using nanobeam electron diffraction. The results reveal that the growth yields nearly 90% semiconducting tubes, 45% of which are of the (6,5) type. The growth mechanisms as well as the roles of different components in the catalyst were studied in situ using environmental transmission electron microscopy and infrared spectroscopy. On the basis of the understanding of carbon nanotube growth mechanisms, an MgO-supported FeCu catalyst was prepared by impregnation, showing similar catalytic performance as the atomic layer deposition-prepared catalyst, yielding single-walled carbon nanotubes with a similar narrow chirality distribution.