The CeO2-based mixed potential type gas sensors attached with MMnO3 (M: Sr, Ca, La and Sm) sensing electrode have been fabricated to detect acetone. All MMnO3 materials were prepared by a simple sol-gel method. The results indicated that the response of the sensor based on SrMnO3 sintered at 1000 °C to 20 ppm acetone was the highest compared with sensors using MMnO3 (M: Ca, La and Sm)-SE, which was −49 mV. The sensor attached with SrMnO3-SE could detect even 1 ppm acetone, and the response value (ΔV) was −3 mV, which was an acceptable value. The ΔV of the sensor was linearly changed with the logarithm of acetone concentration in the range of 1–50 ppm and the sensitivity was −36 mV/decade. Most notably, the typical 90% response and recovery times of the sensor attached with SrMnO3-SE to 20 ppm acetone were only 2 s and 6 s. Moreover, the sensor manifested good repeatability and stability. Besides, the sensing mechanism of the sensor was explained, and polarization curve was measured to further demonstrate the mixed potential mechanism.
Solid State Ionics – Elsevier
Published: Apr 1, 2018
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