English

Introduction

Professor, Doctor of Engineering.　He was born in Wakayama Prefecture, Japan,in 1956, and received B.Sc. from Doshisha University in 1979. He went on to study graphite intercalation compounds with fluorine and metal fluorides under a guidance of Professor N.Wananabe and Professor T.Nakajima in Kyoto University and received his M.Sc. and Ph.D.(1984) from Kyoto University.

After working for the Central Glass Co. for 10 years, he moved to Osaka Electro-Communication University in 1994 and was promoted to Associate Professor(1995) and Full Professor(1999). In 1985 to 1986, he studied syntheses of B/C/N materials and also fluorine chemistry, both of which are among his interests, with Professor N.Bartlett at the University of California.

Affiliation

Department of Environmental Science
Graduate School of Engineering
Fundamental Electronics Research Institute

Osaka Electro-Communication University
18-8 Hatsu-cho, Neyagawa, Osaka 572-8530, Japan

Researth Subjects

(1) Syntheses and Characteristics of Boron/Carbon/Nitrogen Materials Based on the Graphite Network

(2) Carbon/Nitrogen Materials with Unique Properties

(3) Environmental and Energy Related Theme

Background and Recent Works in This Lab.

(1) Boron/Carbon/Nitrogen (B/C/N) materials based on the graphite network have been of particular interest in recent years because of their potential applications as new semiconductors and host materials. We synthesized the compound BC₃N and BC₆N by the CVD reaction of acrylonitrile with boron trichloride (molar ratio 1:1 and 2:1, respectively). We can control the composition BCxNy through changing the CVD conditions (molar ratios of starting gases,temperature, etc.) by using acetonitrile with boron trichloride as starting materials. B/C/N thick films can be applied to the anode material of secondary lithium battery.

(2) Boron/Carbon(B/Cx : x = 8〜22) materials based on the graphite network have also prepared by the CVD reaction of ethylene with boron trichloride, B/C materials are applicable to the anodes of lithium and sodium ion batteries.

(3) Several kinds of C/N materials were prepared and their properties were investigated.
(3-1)C₃N₄-type materials were prepared by the following ractions:

　　C₃N₃Cl₃ + Li₃N → C₃N₄ + 3LiCl 　　--- (a)
　　3CCl₄ + 16NH₃ → C₃N₄ + 12NH₄Cl --- (b)

The materials obtained by these reactions were harder than quartz crystal whose Mohs hardness is 7, and showed photoluminescence (blue color) by the excitation of UV light.

(3-2) Carbon/nitrogen material with a layered structure could be made by the following reaction:
　2C₃N₃Cl₃ + 3NH₃ → (C₃N₃)₂(NH)₃ + 6HCl --- (c)

This material could be used as a new host material.

(3-3) Carbon/nitrogen material with a C/N atomic ratio of 3.0 was prepared by pyrolysis (1070K) of 2,3,6,7-tetracyano-1,4,5,8-tetraazanaphthalene and other organic precursors. The material showed a BET surface area of 880m²/g and unique properties such as a large electric double layer capacitance of 160F/g by using 3 electrode cell in 1M-H₂SO₄ aqueous solution.

(4) We have synthesized other new materials composed of carbon or fluorine and applied these materials for environmental and energy related fields such as electrochemical capacitors, hydrogen evolution, and secondary batteries.