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Structure of Frilled Carbon Nanowires Synthesized by Sulfur-assisted Chemical Vapor Deposition

Published online by Cambridge University Press:  15 March 2011

Tadashi Mitsui ,
Takashi Sekiguchi ,
Mikka Nishitani-Gamo ,
Yafei Zhang  and
Toshihiro Ando
Tadashi Mitsui
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science (NIMS) Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
Takashi Sekiguchi
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science (NIMS) Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
Mikka Nishitani-Gamo
Affiliation:
Insititute of Applied Physics and Center for Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8577, Japan
Yafei Zhang
Affiliation:
Core Research for Evolution Science and Technology (CREST) of Japan Science and Technology Cooperation (JST), c/o Advanced Materials Laboratory, NIMS Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan
Toshihiro Ando
Affiliation:
Core Research for Evolution Science and Technology (CREST) of Japan Science and Technology Cooperation (JST), c/o Advanced Materials Laboratory, NIMS Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan
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Abstract

Effects of hydrogen sulfide on the structure of carbon nanotubes (CNTs) were studied using high-resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS). The CNTs were synthesized with an iron thin-film catalyst by microwave plasma-assisted CVD on the diamond substrate. The HRTEM images revealed that essentially all of the CNTs obtained in this study were multiwall (MWCNT). The addition of H2S resulted in nanotubes with split skins as cornhusks and/or frills. Electron energy loss spectra of the cornhusks indicated that they consist of sp2, sp3 and amorphous carbon phase. The spectra revealed that the sp3 to sp2 ratio at the points where cornhusks divide from the main stem was more than that at the edge of the cornhusks. No evidence of sulfur incorporation into the MWCNTs grown with the H2S addition was found. We speculate that the chemical nature of sulfur on the CNT growth yields such anomalous structure.

Type
Article
Information
MRS Online Proceedings Library (OPL) , Volume 706: Symposium Z – Making Functional Materials with Nanotubes , 2001 , Z3.10.1
Copyright
Copyright © Materials Research Society 2002

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