Release of N(2) from the carbon nanotubes via high-temperature annealing |
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Authors: | Choi Hyun Chul Bae Seung Yong Jang Woo-Sung Park Jeunghee Song Ha Jin Shin Hyun-Joon Jung Hyunsung Ahn Jae-Pyoung |
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Institution: | Department of Chemistry, Korea University, Jochiwon 339-700, South Korea. |
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Abstract: | Nitrogen (N)-doped carbon nanotubes (CNTs) were heated to 1000 degrees C under an ultrahigh vacuum. X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) reveal three different N structures; graphitelike, pyridine-like, and molecular N(2). The vibrationally resolved XANES peaks of N(2) were first observed, suggesting the existence of molecular N(2) as intercalated and trapped forms. The annealing process can decrease the average N content from 6.3 at. % to 3.3 at. %, mainly by releasing molecular N(2). Electron energy-loss spectroscopy (EELS) confirms that the annealing releases molecular N(2) from the CNTs. |
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