To provide a microelectrochemical detector having an acting electrode capable of producing a redox cycle on the upper surface and side surface of an electrode and having high detection sensitivity even with respect to a specimen substance of low concentration.
The film thickness of the electrode is set to a thickness of a micron order. That is, the upper surface part of the electrode is made the same as a plurality of conventional electrode structures separated by a microgap and a structure wherein the electrode having width equal to the film thickness is opposed to the side surface part so as to leave an electrode gap is added. The area of the electrode becomes about three times as compared with a conventional comb-shaped membrane electrode. By this constitution, in addition to a redox cycle occurring between the upper surfaces of the electrodes obtained even in a conventional planar type electrode, a current can be increased by the redox cycle newly occurring between the side surfaces of the electrodes. Further, the thick membrane electrodes equal to the electrode gap are arranged in mutually opposed relationship, thereby the specimen substance oxidized or reduced on the side surface of one electrode is hardly diffused to the bulk in the periphery of the upper part of the electrode and easily captured by the other electrode.
TABEI HISAO
SHIBANO SAYAKA
YAMAMOTO KATSUNOBU
BAS INC
Kazuo Abe