Abstract
Due to the importance of pH values for the control of water quality and chemical reactions, pH meter has been employed as a routine instrument in research laboratories and various industrial sectors to probe the acidity or alkalinity of aqueous solutions. Up to date, the most widely used pH sensor is conventional glass-type electrode which typically suffers from the disadvantage of the brittleness. Ion-sensitive field-effect transistor and optical pH sensors are also developed with improved durability, however, they have high power consumption concern and are not suitable for some specific applications. Therefore, solid-state pH sensor, which shares the similar detecting principle (electromotive force between sensing and reference electrodes) as conventional glass-type pH sensor, gradually becomes the trends in the development of pH sensor due to its durability, low cost and small size. In this study, nanostructured metal oxides from group 9 metals were synthesized and characterized, and then systematically investigated in solid-state pH sensing. The performance of different metal oxide-based solid-state pH sensors was compared through pH titration.
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