Investigation of Room Temperature Protonic Conduction of Perovskite Humidity Sensors

This paper shows a correlation between surface effective porosity due to various sintering regimes and humidity sensitive electrical properties of the perovskite-based bulk type sensors, at room temperature. Furthermore, temperature transduction mechanism thick film sensors was studied in detail through electrochemical impedance spectroscopy (EIS) major transmissive components were detected by fitting Bode diagrams Nyquist complexes equivalent circuits. The microstructural, morphological elemental characterizations carried on using XRD, EFTEM, FESEM, EDX. Physical including open porosity/bulk density investigated American Standard Test Method (ASTM). An innovative self-designed material test fixture with ceramic supports fabricated for high S/N ratio measurement samples. All set up 20-95% RH. morphological, physical, results pellets indicate direct cavities AC conduction. higher is, greater is conduction vice versa. Presence ionic transport clearly observed from frequency-conductance spectra Noise-free behavior via EIS proves that proton transfer dominant responsible, executed both charge resistance kinetically controlled (diffusive species) low middle Next Warburg effect (at 80% RH), first time, Gerischer found as agent 85% RH above.