Hashimoto Tadanori, Kuno Tomonari, Ito Daiki, Ishihara Atsushi, Nishio Yuji
Division of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-Cho, Tsu, Mie, 514-8507, Japan.
HORIBA Advanced Techno, Co., Ltd., 2 Miyanohigasi, Kisshoin, Minami-Ku, Kyoto, 601-8551, Japan.
Heliyon. 2023 Jan 18;9(1):e12966. doi: 10.1016/j.heliyon.2023.e12966. eCollection 2023 Jan.
Glass pH sensors are unsuitable for in vivo biomedical, clinical, or food applications because of the brittleness of glass and the difficulty in measuring small volumes. Enamel structures such as glass/stainless steel are candidates for glass-based pH electrodes. In this study, new enamel electrodes for pH sensors using FeO-TeO-based glass/stainless steel were developed. The effect of NiO addition to FeO-TeO glass on the pH sensitivity and the three-point bending strength of enamels were investigated. The effect of NiO addition to FeO-TeO glass/stainless steel on the pH sensitivity was negligible. FeO-TeO-based glass/stainless steel showed pH sensitivity appropriate to a working electrode. Enameling at a lower temperature under an air atmosphere was desirable for narrowing the gap between pH 4-7 and pH 7-9 sensitivities. The NiO addition to FeO-TeO glass/stainless steel decreased the three-point bending strength. Therefore, NiO did not serve as an adhesion oxide in the FeO-TeO glass. FeO-TeO glass/stainless steel possessed the highest three-point bending strength among all samples when prepared at 670 °C under an air atmosphere. Therefore, no NiO addition and enameling at a lower temperature under an air atmosphere are desirable for obtaining more robust FeO-TeO glass/stainless steel than LiO-SiO-based glass electrodes for pH sensors.
玻璃pH传感器由于玻璃的脆性以及测量小体积样品的困难，不适用于体内生物医学、临床或食品应用。诸如玻璃/不锈钢之类的搪瓷结构是基于玻璃的pH电极的候选材料。在本研究中，开发了使用FeO-TeO基玻璃/不锈钢的新型pH传感器搪瓷电极。研究了向FeO-TeO玻璃中添加NiO对搪瓷的pH敏感性和三点弯曲强度的影响。向FeO-TeO玻璃/不锈钢中添加NiO对pH敏感性的影响可忽略不计。FeO-TeO基玻璃/不锈钢表现出适合作为工作电极的pH敏感性。在空气气氛下较低温度下进行搪瓷处理有利于缩小pH 4-7和pH 7-9敏感性之间的差距。向FeO-TeO玻璃/不锈钢中添加NiO会降低三点弯曲强度。因此，NiO在FeO-TeO玻璃中不作为粘结氧化物。当在空气气氛下670℃制备时，FeO-TeO玻璃/不锈钢在所有样品中具有最高的三点弯曲强度。因此，对于获得比用于pH传感器的LiO-SiO基玻璃电极更坚固的FeO-TeO玻璃/不锈钢而言，不添加NiO并在空气气氛下较低温度下进行搪瓷处理是可取的。
