Study of encapsulated mechanism of N2 into central hollow of multiwall carbon nanotube

Abstract Submitted to the ;

Study of encapsulated mechanism of N2 into central hollow of multiwall carbon nanotube

Ji Hoon Yang1, Dae Ho Lee1, Min Hyung Yum1, Eun Jung Kim1, Yong Sook Shin1, Myeung Hoi Kwon2, Chul Woong Yang3, Ji-Beom Yoo3, Ha-Jin Song4, Hyun-Joon Shin4, and Chong-Yun Park1

1 Center for Nanotubes and Nanostructured Composites, Dept. of Physics, Sungkyunkwan University, 300 Chunchun-dong, Suwon 440-746, Korea,
2 Physics Department, University of Incheon Dowhadong 177, Namku, Incheon, Korea
3Center for Nanotubes and Nanostructured Composites, School of Metallurgy and Materials Engineering, Sungkyunkwan University, 300 Chunchun-dong, Suwon 440-746, Korea
4 Beamline Research Division, Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 790-784, Korea
Contact e-mail: kwonmh@incheon.ac.kr

Recent studies have revealed that gaseous molecules can be stored in carbon nanotube (CNT). In the typical process of gas molecule storage, high-pressure gas was introduced after growing nanotube. However, nitrogen molecules could be encapsulated directly in the hollow of carbon nanotube core during the growth procedure. For studying the encapsulated mechanism of nitrogen molecules, we synthesized the tip growth CNT and bottom growth CNT by dc plasma-enhanced chemical vapor deposition and microwave enhanced plasma chemical deposition, respectively. Crystal structure, composition, and electronic structure of nanotubes were investigated using SEM, XPS, and HRTEM equipped with GATAN image filter (GIF). The diagonosis of plasma was carried out with OES. In the case of dc PECVD, Well-crystalline N-CNTs were grown. The distributions of nitrogen atoms and molecules on CNTs were investigated by elementary mapping using GIF and near-edge x-ray absorption fine structure. Based on experimental measurements, we will suggest the direct encapsulation mechanism of nitrogen molecules into the hollows of CNT during the growth process.

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