TAILIEUCHUNG - Báo cáo hóa học: " Magnetometric Studies of Catalyst Refuses in Nanocarbon Materials"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Magnetometric Studies of Catalyst Refuses in Nanocarbon Materials | Nanoscale Res Lett 2008 3 60-64 DOI s11671-007-9115-z NANO EXPRESS Magnetometric Studies of Catalyst Refuses in Nanocarbon Materials Irina V. Ovsienko Lyudmila Yu. Matzuy Nykolai I. Zakharenko Nykolai G. Babich Tetyana A. Len Yuriy I. Prylutskyy David Hui Yuri M. Strzhemechny Peter C. Eklund Received 19 October 2007 Accepted 15 December 2007 Published online 8 January 2008 to the authors 2008 Abstract It is shown that magnetometry can be employed as an effective tool to control the content of a ferromagnetic constituent in nanocarbon materials. We propose a thermochemical treatment protocol to achieve extensive cleaning of the source nanocarbon materials from ferromagnetic refuses. Keywords Nanocarbon material Magnetometry Carbon nanotubes Catalyst refuse Magnetic susceptibility Thermochemical treatment Introduction There is a number of common procedures to fabricate carbon nanotubes CNT by . thermal sputtering of graphite in an electric arc laser evaporation etc. 1-8 . For any of them the synthesized substance is a nanocarbon material NCM containing not only single-wall and multiwall CNT but also amorphous carbon graphite nanoparticles and catalyst refuses. Transition metals are commonly used as catalysts for the CNT synthesis. Their contents depend on the synthesis procedure 9-11 . To obtain CNT of the highest possible purity it is therefore vital to understand and control the routes of their rectification. At the same time it is necessary to control the composition of the synthesized material. For instance a fast method for quantitative analysis of the amorphous component is based on Raman scattering as described in Refs. 12-15 . The presence of the metallic component is I. V. Ovsienko L. Yu. Matzuy N. I. Zakharenko N. G. Babich T. A. Len Department of Physics Kyiv National Shevchenko University Volodymyrska Str. 64 03310 Kyiv Ukraine I. V. Ovsienko e-mail ovsienko@ L. Yu. Matzuy e-mail matzui@ N. I. Zakharenko e-mail .

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