National Institute of Advanced Industrial Science and Technology

The University of Tokyo

Tokai Carbon Company, Ltd.

Hiroaki Hatori

Masaya Kodama

Yasushi Soneda

Toshihira Irisawa

Hiroshi Fujioka

Kenji Hata

Hitoshi Ue

Osamu Tanaike

Tetsuro Hirasaki

Junya Yamashita

Naoko Tomita

The present application provides methods for producing polybenzimidazole carbon fiber that does not require infusibilization treatment.

Method for producing a polybenzimidazole carbon fiber

To provide a carbon fiber precursor fiber that can efficiently produce a carbon fiber excellent in mechanical strength without an infusibilization treatment; a carbon fiber; and a method for producing the carbon fiber. The carbon fiber precursor fiber includes a polymer represented by General Formula (1) below:  

Precursor fiber for carbon fibers, carbon fiber, and method for producing carbon fiber

A semiconductor substrate that includes a semiconductor layer that exhibits high crystallinity includes a graphite layer formed of a heterocyclic polymer obtained by condensing an aromatic tetracarboxylic acid and an aromatic tetramine, and a semiconductor layer that is grown on the surface of the graphite layer, or includes a substrate that includes a graphite layer formed of a heterocyclic polymer obtained by condensing an aromatic tetracarboxylic acid and an aromatic tetramine on its surface, a buffer layer that is grown on the surface of the graphite layer, and a semiconductor layer that is grown on the surface of the buffer layer.

Semiconductor substrate, method for producing semiconductor substrate, substrate for semiconductor growth, method for producing substrate for semiconductor growth, semiconductor element, light-emitting element, display panel, electronic element, solar cell element, and electronic device

An electrochemical capacitor comprising a nonaqueous electrolyte and a pair of polarizable electrodes, wherein carbon nanotubes are used as an electrode material for at least one of the positive electrode and the negative electrode, the carbon nanotubes have a specific surface area of at least 700 m/g and contain semiconductive carbon nanotubes, and the electrode material exhibits a voltage dependency of differential capacity by electrochemical doping. The electrochemical capacitor solves the problems associated with activated carbon electrodes and, exploiting the excellent characteristics of carbon nanotubes, has increased capacitance and increased energy density, therefore realizing a reduced internal resistance and a prolonged service life.

Electrochemical capacitor and electrode material for use therein

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Ibaraki, Japan

Hiroaki Hatori