New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors

摘要: In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the NRs-based sensor was constructed, showing good performance on interaction with 100 ppm EtOH in ambient air at 327 °C. Then, same NRs film investigated by NAP-XPS presence 1 mbar oxygen, simulating atmosphere and O2/EtOH mixture temperature. The partial pressure 0.1 mbar, which corresponded to analytes air. To better understand EtOH-sensing mechanism, spectra were also studied exposure O2/EtOH/H2O O2/MeCHO (MeCHO = acetaldehyde) mixtures. Our results revealed that reaction chemisorbed oxygen surface follows acetaldehyde pathway. It demonstrated that, during sensing process, becomes contaminated different products MeCHO decomposition, decreases dc-sensor performance. However, ac does not seem be affected phenomenon.