A dewing sensor consisting of two insulated comb-like copper electrodes is fabricated byphotolithography to monitor the formation dynamics of thin electrolyte layer (TEL), as well as theatmospheric corrosion of copper during the wettingdrying and high-low temperature cyclic tests.The sensor can probe earlier dew condensation on Cu even at very low relative humidity (60% RH)thanks to the ultra-small (100 μm) space between the comb-like electrodes. Meanwhile, the dewingprocess is also confirmed by simultaneous Attenuated Total Reflectance-Fourier Infraredspectroscopy (ATR-IR) and video microscopy. The corrosion rate of copper electrodes under TELis monitored by EIS, which is proportional to relative humidity (RH), temperature and depositionamount of salt particles. During the drying process of TEL, the solution resistance of TEL firstlyincreases slowly and then increases abruptly due to the salt precipitation from the TEL. The sensoris proven to be sensitive to monitor the wetting and drying process and atmosphere corrosion ofcopper in natural atmosphere.
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