US 12,306,130 B2
Electrochemical sensor unit, electrode for electrochemical sensor, and method of manufacturing electrode for electrochemical sensor
Kaori Kurihara, Hitachi (JP); Yohei Otoki, Hitachi (JP); and Fumimasa Horikiri, Hitachi (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/628,037
Filed by SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
PCT Filed Jul. 15, 2020, PCT No. PCT/JP2020/027464
§ 371(c)(1), (2) Date Jan. 18, 2022,
PCT Pub. No. WO2021/015067, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 2019-133226 (JP), filed on Jul. 19, 2019.
Prior Publication US 2022/0260516 A1, Aug. 18, 2022
Int. Cl. G01N 27/30 (2006.01); C23C 16/27 (2006.01); G01N 27/403 (2006.01)
CPC G01N 27/308 (2013.01) [C23C 16/271 (2013.01); G01N 27/403 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An electrochemical sensor unit, comprising:
a working electrode; and
a counter electrode,
wherein the working electrode includes a diamond film which generates a redox reaction on a surface when a voltage is applied between the working electrode and the counter electrode, and a support which is formed of a material different from diamond and supports the diamond film,
when the working electrode is viewed laterally, in the support, a width of a second surface opposite to a first surface in contact with the diamond film is smaller than a width of the diamond film,
the first surface is a planar surface,
the diamond film is provided only on the first surface,
in the diamond film, a surface opposite to a surface in contact with the support is a planar surface,
when the working electrode is viewed laterally, side surfaces of the support are exposed, and
a liquid test sample is supplied to the working electrode from the diamond film side.