Preparation of Perovskite-Type Oxide Thick-Film Device by EPD Method and Its Application for Electrochemical Hydrogen-Phosphate Ion Sensor

摘要

Perovskite-type oxide (LaCoO_3) fine powders were prepared by a polymer precursors (PP) methods at 300~500°C. The LaCoO_3 fine powder could be prepared at 380°C when the use of EDA and PEG for organic- and polymer- additives, respectively. The surface area of LCO was ca. 39m~2/g. LCO thick-film could be prepared from the steady state suspension with the addition of AcAc or PVA by the EPD method at +10V, 3min. The current density of the LaCoO_3 film sensor was changed with changing HPO_4~(2-) concentration at +1.00 V vs. SCE. The device showed relatively good amperometoric response to H_2PO_4 from 1.0x10~(-5)M to 1.0x10~(-3)M with the 90% response time of ca 2min. The LaCoO_3-based sensor also showed a good selectivity among the examined anions of NO_3, Cl and SCN.