Department of Chemistry, Faculty of Science and Arts, Najran University, Najran, 11001, Saudi Arabia; Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran, 11001, Saudi Arabia.
Department of Chemistry, Faculty of Science and Arts, Najran University, Najran, 11001, Saudi Arabia; Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran, 11001, Saudi Arabia.
Environ Res. 2021 Sep;200:111377. doi: 10.1016/j.envres.2021.111377. Epub 2021 May 28.
This paper reports synthesis, properties and gas sensing applications of ZnO nanoflowers and CdO-ZnO nanorices prepared by hydrothermal process. The morphological characterizations confirmed the formation of well-defined nanoflowers and nanorices structures for ZnO and CdO-ZnO nanomaterials, respectively. The structural properties revealed the wurtzite hexagonal phase of the synthesized materials. The sensor devices based on ZnO nanoflowers and CdO-ZnO nanorices were fabricated and tested towards various gases including ethanol, methanol, ammonia, carbon monoxide, methane and formaldehyde. The fabricated gas sensor based on CdO-ZnO nanorices exhibited a high response (34.5) towards 300 ppm formaldehyde gas at 350 °C compared to ZnO nanoflowers (14.5) under the same experimental conditions. The response and recovery times for ZnO nanoflowers-based sensor were~9.8 s and ~6 s while for CdO-ZnO based sensor, these were ~10s and ~6s, respectively. A rapid response (34.5) for CdO-ZnO nanorices based formaldehyde gas sensor was observed as compared to other gases such as ammonia (12.3), methanol (16.5), ethanol (20), carbon monoxide (16.3) and methane (12.4), which confirm the high-selectivity towards formaldehyde gas. Finally, a plausible formaldehyde gas sensing mechanism is proposed.
本文报道了通过水热法合成的 ZnO 纳米花和 CdO-ZnO 纳米棒的合成、性质和气体传感应用。形态特征证实了 ZnO 和 CdO-ZnO 纳米材料分别形成了定义良好的纳米花和纳米棒结构。结构特性揭示了所合成材料的纤锌矿六方相。基于 ZnO 纳米花和 CdO-ZnO 纳米棒的传感器器件已制备并用于测试各种气体，包括乙醇、甲醇、氨、一氧化碳、甲烷和甲醛。与 ZnO 纳米花（14.5）相比，在相同实验条件下，基于 CdO-ZnO 纳米棒的甲醛气体传感器在 350°C 时对 300ppm 甲醛气体表现出 34.5 的高响应。基于 ZnO 纳米花的传感器的响应和恢复时间分别约为 9.8s 和 6s，而基于 CdO-ZnO 的传感器的响应和恢复时间分别约为 10s 和 6s。与其他气体（如氨（12.3）、甲醇（16.5）、乙醇（20）、一氧化碳（16.3）和甲烷（12.4）相比，基于 CdO-ZnO 纳米棒的甲醛气体传感器表现出快速响应（34.5），这证实了对甲醛气体的高选择性。最后，提出了一个合理的甲醛气体传感机制。
