Preparation of layered perovskite-type cuprate thick-film electrode by electrophoretic deposition method and its nitrite-ion sensing properties

Abstract

Detection of nitrite-ion has become very important for various industrial fields due to its wide application range such as food additives and a rust preventive agent for steels. In this study, we attempted at developing an advanced method to produce layered perovskite-type cuprates based thick-film device for highly sensitive electrochemical sensor for nitrite-ion with a capacity of wide concentration range. Here, layered perovskite-type oxide powders could be synthesized by a polymer precursor method which was deposited on alumina supports with gold electrode by an electrophoretic deposition method. The sensor performance was measured by an amperometric method for nitrite-ion detection. It was found that the Gd 2 CuO 4-based electrode showed fast and good linear responses to nitrite-ion for a wide range of concentration.

Electrochemical Sulfite‐Ion Sensor Using Sm2CuO4‐Based Layered Perovskite‐Type Oxide Thick Film

“…Oxyanions, such as sulfite (SO 3 2− ), nitrate (NO 3 − ), and nitrite (NO 2 − ) ions, are used to prevent the oxidation of solutions, fertilizers, and corrosion protectors, but are one of the pollutants that cause eutrophication in closed water systems [1]. The sulfite ion is highly effective in preventing the oxidation of solutions, but is toxic to human beings [2].…”

“…Structure of the oxide thick film sensor device finally calcined at 500 • C for 2 h. Figure 1 shows the structure of the sensor device. The thick film was electrophoretically deposited on an Au-coated Al 2 O 3 substrate at −5.0 V for 60 s and sintered at 600 • C for 1 h [1]. The synthesized oxides were characterized by X-ray diffractometry (XRD; Ultima IV, Rigaku) with Cu-K α1 radiation, X-ray photoelectron spectrometry (XPS; AXIS-NOVA), and surface area measurement (BET; BELSORP-mini II).…”