Electronic structure and field emission of multiwalled carbon nanotubes depending on growth temperature |
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Authors: | Yoon Sang Won Kim Shin Young Park Jeunghee Park Chan Jun Lee Cheol Jin |
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Affiliation: | Department of Chemistry, Korea University, Jochiwon 339-700, Korea. |
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Abstract: | The electronic structure of multiwalled carbon nanotubes (CNTs) has been investigated, depending on the growth temperature, using synchrotron X-ray photoelectron spectroscopy (XPS) and field emission measurements. The vertically aligned CNTs are grown via pyrolysis of ferrocene and acetylene in a broad temperature range 600-1000 degrees C. The CNTs have a cylindrical structure with a uniform diameter of 20 nm. As growth temperature increases, due to an improved crystallinity of the graphitic sheets, the width of the XPS C 1s peak becomes narrower and the intensity of the valence band increases. Field emission from the as-grown CNTs exhibits a large enhancement of current density with growth temperature, strongly correlated with the electronic structure revealed by XPS. |
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