Ethanol gas sensing mechanisms of p-type NiO at room temperature

• Two competing and opposing processes control the sensing response of NiO to ethanol. surface orientation strongly determine its interaction with ethanol at RT. Charge transfer adsorbed molecules dominates in anomalous response. Ethanol decomposition is responsible for normal The shows faster dynamics better sensitivity Conductometric gas sensors based on metal oxide semiconductors (MOS) usually require high temperature operation, increasing their energy consumption limiting applicability. However, room operation these devices still remains a challenge many sensor-analyte systems due part low or null recovery speeds obtained this temperature. In work, conductometric p-type ceramic samples studied under operation. An consisting an unexpected resistance decrease upon exposure observed depending sample texturing, which tuned by changing are synthesized. This characterized fast times. A model two mechanisms, either electron from molecule catalytic ethanol, proposed explain Extending other MOS could pave way operating