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Property control of new forms of carbon materials by fluorination |
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| Authors: | Hidekazu Touhara Junichi InaharaTomotaka Mizuno Yu YokoyamaSatoru Okanao Katsuaki YanagiuchIndrajit Mukopadhyay Shinji KawasakiFujio Okino Hirofusa ShiraiWH Xu T KyotaniA Tomita |
| Institution: | a Department of Chemistry, Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan b TDK Corporation, Saku 385-8555, Japan c Department of Functional Polymer Chemistry, Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan d Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan |
| Abstract: | Multiwall carbon nanotubes (MWNTs) based on the template carbonization technique were fluorinated in a temperature range 323-473 K by elemental fluorine. The fluorination of the carbon nanotubes results in functionalization and modification of pristine nanotubes with respect to adsorption and electrochemical properties. Selective fluorination of the inner surface of the carbon nanotubes, brings about a decrease in the surface free energy of the inner surface of the tubes and an increase in colombic efficiency of Li/nanotubes rechargeable cells in an aprotic medium. Electrochemical fluoride-ion doping of fullerene C60 thin films (250-450 nm) was carried out in a fluoride-ion conductive solution, MeCN solution of 1 M Et4NF·4HF. Galvanostatic oxidation yielded C60Fca.1-3 where fluorine exists as a semi-ionic species in the cavity surrounded by C60 molecules without forming covalent CF bonds |
| Keywords: | Fluorination by elemental fluorine Electrochemical fluorine doping Multiwall carbon nanotubes Fullerene C60 Adsorption Lithium cells |
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