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Observation of CO Detection Using Aluminum-Doped ZnO Nanorods on Microcantilever.
Sensors ( IF 3.9 ) Pub Date : 2020-04-03 , DOI: 10.3390/s20072013
Ratno Nuryadi 1 , Lia Aprilia 2 , Makoto Hosoda 2 , Mohamad Abdul Barique 2 , Arief Udhiarto 3 , Djoko Hartanto 3 , Muhammad Budi Setiawan 4 , Yoichiro Neo 2 , Hidenori Mimura 2
Affiliation  

An oscillating piezoresistive microcantilever (MC) coated with an aluminum (Al)-doped zinc oxide (ZnO) nanorods was used to detect carbon monoxide (CO) in air at room temperature. Al-doped ZnO nanorods were grown on the MC surface using the hydrothermal method, and a response to CO gas was observed by measuring a resonant frequency shift of vibrated MC. CO gas response showed a significant increase in resonant frequency, where sensitivity in the order of picogram amounts was obtained. An increase in resonant frequency was also observed with increasing gas flow rate, which was simultaneously followed by a decrease in relative humidity, indicating that the molecular interface between ZnO and H2O plays a key role in CO absorption. The detection of other gases of carbon compounds such as CO2 and CH4 was also performed; the sensitivity of CO was found to be higher than those gases. The results demonstrate the reversibility and reproducibility of the proposed technique, opening up future developments of highly sensitive CO-gas detectors with a fast response and room temperature operation.

中文翻译:

在微悬臂梁上使用铝掺杂ZnO纳米棒进行CO检测的观察。

涂有铝(Al)掺杂的氧化锌(ZnO)纳米棒的振荡压阻微悬臂梁(MC)用于在室温下检测空气中的一氧化碳(CO)。使用水热法在铝表面上生长了掺铝的ZnO纳米棒,并通过测量振动的MC的共振频率偏移观察了对CO气体的响应。CO气体响应显示出共振频率的显着增加,其中获得了皮克数量级的灵敏度。随着气体流速的增加,共振频率也增加,同时相对湿度也降低,这表明ZnO和H2O之间的分子界面在CO吸收中起关键作用。还进行了碳化合物(如CO2和CH4)的其他气体的检测。发现CO的灵敏度高于那些气体。结果证明了所提出技术的可逆性和可重复性,为具有快速响应和室温操作的高灵敏度CO气体探测器的未来发展开辟了道路。
更新日期:2020-04-03
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