Abstract

In this study, novel transparent nanoporous films exhibiting insulating properties were fabricated by a new chemical dealloying method of Cu-Cr with no requirement of high-temperature annealing. Furthermore, for the first time to the best of our knowledge, the fabricated nanoporous film was successfully applied as a nanoporous electrode film filter of a moisture-in-oil sensor: The fabricated moisture-in-oil sensor exhibited outstanding sensitivity and a low hysteresis of 7.4% FS in air, which was less than the desired value of 10.0% FS. Furthermore, the sensor exhibited a favorable 90% response time in oil, which was 8 min and well less than the desired value of 10 min.

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