By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Fullerenes. According to news originating from Shanghai, People's Republic of China, by NewsRx correspondents, research stated, "We demonstrate that reactions confined within single-walled carbon nanotube (SWCNT) channels are modulated by the metallic and semiconducting character of the hosts. In situ Raman and X-ray absorption near-edge structure spectroscopies provide complementary information about the electronic state of carbon nanotubes and the encapsulated rhenium species, which reveal electronic interactions between encapsulated species and nanotubes."
Our news journalists obtained a quote from the research from the Shanghai Institute of Applied Physics, "More electrons are transferred from metallic tubes (m-SWCNTs) to oxidic rhenium clusters, leading to a lower valence state rhenium oxide than that in semiconducting tubes (s-SWCNTs). Reduction in 3.5% (vol/vol) H-2/Ar leads to weakened host-guest electronic interaction. The high valence state Re within s-SWCNTs is more readily reduced when raising the temperature, whereas only a sluggish change is observed for Re within m-SWCNTs. Only at 400 degrees C does Re reach a similar electronic state (mixture of Re-0 and Re4+) in both types of tubes. Subsequent oxidation in 1% O-2/Ar does not show changes for Re in s-SWCNTs up to 200 degrees C. In comparison, m-SWCNTs facilitate the oxidation of reduced rhenium (160 degrees C). This can be exploited for rational design of active catalysts with stable species as a desired valence state can be obtained by selecting specific-type SWCNTs and a controlled thermal treatment."
According to the news editors, the research concluded: "These results also provide a chemical approach to modulate reversibly the electronic structure of SWCNTs without damaging the sidewalls of SWCNTs."
For more information on this research see: Tuning the redox activity of encapsulated metal clusters via the metallic and semiconducting character of carbon nanotubes. Proceedings of the National Academy of Sciences of the United States of America, 2013;110(37):14861-14866. Proceedings of the National Academy of Sciences of the United States of America can be contacted at: Natl Acad Sciences, 2101 Constitution Ave NW, Washington, DC 20418, USA. (National Academy of Sciences - www.nasonline.org/; Proceedings of the National Academy of Sciences of the United States of America - www.nasonline.org/publications/pnas/)
The news correspondents report that additional information may be obtained from F. Zhang, Chinese Academy Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, People's Republic of China. Additional authors for this research include X.L. Pan, Y.F. Hu, L. Yu, X.Q. Chen, P. Jiang, H.B. Zhang, S.B. Deng, J. Zhang, T.B. Bolin, S. Zhang, Y.Y. Huang and X.H. Bao (see also Fullerenes).
Keywords for this news article include: Asia, Shanghai, Fullerenes, Nanotechnology, Carbon Nanotubes, Emerging Technologies, People's Republic of China
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