Encapsulation mechanism of N2 molecules into the central hollow of carbon nitride multiwalled nanofibers |
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Authors: | Ji Hoon Yang Min Hyung Yum Eun Jung Kim Myeung Hoi Kwon Cheol Woong Yang Ha-Jin Song Yong-Wan Jin |
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Affiliation: | a Center for Nanotubes and Nanostructured Composites (CNNC), Institute of Basic Science, Sungkyunkwan University, 300 Chunchun-dong, Suwon 440-746, Republic of Korea b Physics Department, University of Incheon, 177 Dowha-dong, Incheon 402-749, Republic of Korea c CNNC, School of Metallurgy and Materials Engineering, Sungkyunkwan University, 300 Chunchun-dong, Suwon 440-746, Republic of Korea d Beamline Research Division, Pohang Accelerator Laboratory, POSTECH, Pohang, Kyunbuk 790-784, Republic of Korea e Materials Lab., Samsung Advanced Institute of Technology, P.O. Box 111, Suwon 440-600, Republic of Korea |
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Abstract: | Nitrogen molecules have been encapsulated into the central hollows of vertically aligned carbon nitride (CN) multiwalled nanofibers by dc plasma-enhanced chemical vapor deposition with C2H2, NH3, and N2 gases on a Ni/TiN/Si(1 0 0) substrate at 650 °C. X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectra showed the existence of nitrogen molecules in CN nanofibers. Elemental mapping images with electron energy loss spectroscopy of the CN nanofiber and catalyst metal, and optical emission spectroscopy spectra of the plasma showed the distribution of nitrogen atoms and molecules in the CN nanofiber, catalyst metal, and gaseous precursor, respectively. These studies showed that atomic nitrogen diffused into the catalytic metal particle because of the concentration gradient and then saturated at the bottom of the particle. Saturated nitrogen atom participated in the formation of the CN nanofiber wall but most of nitrogen was trapped in the central hollow of the nanofiber as molecules. |
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Keywords: | Carbon nanofibers Chemical vapor deposition Scanning electron microcopy Electron energy loss spectroscopy Gas storage |
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