| 摘要 |
PURPOSE: Disclosed is a method for disentangling hollow carbon micro fibers and to the dispersion of hollow carbon micro fibers, having an outer diameter of 3.5 to 70 nm and an aspect ratio of at least 5, to form transparent electrically conductive carbon film. CONSTITUTION: Hollow carbon micro fibers, treated with a strong acid such as sulfuric acid or oleum and an oxidizing agent such as nitric acid, are disentangled and dispersed homogeneously in a polar solvent. The obtained slurry in which micro fibers are suspended can be coated on a substrate. The coating film is dried and a transparent electrically conductive film is formed. Because hollow carbon micro fibers have self-cohesiveness characteristics and a film comprising the micro fibers can be formed without a binder, a carbon micro fiber aggregation film with excellent transparency can be obtained having a total transmittance of at least 80 % and haze value of at most 0.1 %. Further, this invention relates to an electrically conductive transparent film comprising a binder to improve the strength of the film. |
