Affiliations: [a] Department of Precision Engineering, Tokai University, Kitakaname, Hiratsuka, Kanagawa, Japan | [b] Course of Mechanical Engineering, School of Engineering, Tokai University, Kitakaname, Hiratsukai, Kanagawa, Japan | [c] Department of Molecular Life Sciences, School of Medicine, Tokai University, Isehara, Kanagawa, Japan
Correspondence:
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Corresponding author: Kazuyoshi Tsuchiya, Department of Precision Engineering, Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan. E-mail:tsuchiya@tokai-u.jp
Abstract: pH sensors are used to measure pH of solvents changed by
a chemical reaction in a beaker. Those pH sensors are created by the glass
electrode approach, which has a glass thin film of approximately 0.05 [mm]
at the bottom, and source electrode, which has a liquid interchange at the
bottom; in addition, a silver chloride electrode was included in each
electrode. Because of the complex construction, the size increases, hence it
is important to downsize the pH sensor in ex-change to monitor pH in
microscopic measurement, for instance cells. Nonetheless, it is complicated
to create a smaller sized in the glass electrode method; KCl solution is
used as an internal liquid of the glass electrode and the source electrode.
Hence, in this paper, the solid type of one electrode approach without an
internal liquid as a new pH measuring method is proposed. An antimony
electrode (as a working electrode) creates the one electrode approach and an
Ag/AgIO3 electrode (as a source electrode) deposited on the surface
with Sb/Sb2O3 and SiO2 thin film (as an insulator) of the
functioning electrode. Thus, the proposed sensor is a reliable sensor;
therefore, the coefficient of determination between them shows more than
0.98.
