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Long-term stability response of silicon-based humidity sensors. (a) based on APTS and BB, after operating at 93% RH and 38 °C with applied 0.2 V at 1 kHz, measured at different relative humidities (concentration of precursor solution: 0.5 g/mL); (b) Fe2+-doped polypyrrole up to 30 days at different RH values.
