Behaviors of metals in production of nanonetwork materials investigated by radiochemical technique

Keisuke Sueki, Kazuhiko Akiyama, Chieko Kurata, Kazuya Oogama, Yuliang Zhao, Motomi Katada, Syuichi Enomoto, Shizuko Ambe, Fumitoshi Ambe, Hiromichi Nakahara, Koichi Kikuchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The iron atoms in the SWNTs soot produced from a carbon rod with Fe-Ni metal by the arc-discharge method were studied for their chemical species by Mössbauer spectroscopy. They were found present as a mixture of some Fe-Ni alloys and the α-Fe metal particles of sizes more than 10 nm that were dispersed. No change was observed in the Mossbauer spectra by the treatment of the soot with 1 M HCl but a drastic temperature dependence of the spectra observed for the samples burned in air indicated that more than 50% of the iron was oxidized to Fe2O3 in small particles of less than 10 nm. Effects of acid leaching and baking commonly used for separation of SWNTs were quantitatively studied by use of a radiotracer. Effectiveness of various kinds of metal atoms for forming nanonetwork materials were also investigated by taking advantage of the use of multi-radiotracers. A clear dependence of the yield of metal-containing fullerene species on the boiling point of the metal was indicated, and the yields were found sensitively affected by the amount of the current at the time of dc arc-discharge for the metal elements that were known to take +2 oxidation state in M@C82.

Original languageEnglish (US)
Title of host publicationNanonetwork Materials: Fullerenes, Nanotubes, and Related Systems
PublisherAmerican Institute of Physics Inc.
Pages313-316
Number of pages4
Volume590
ISBN (Electronic)0735400326, 9780735400320
DOIs
StatePublished - Oct 16 2001
EventInternational Symposium on Nanonetwork Materials: Fullerenes, Nanotubes, and Related Systems 2001 - Kamakura, Japan
Duration: Jan 15 2001Jan 18 2001

Other

OtherInternational Symposium on Nanonetwork Materials: Fullerenes, Nanotubes, and Related Systems 2001
CountryJapan
CityKamakura
Period1/15/011/18/01

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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