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Low-Cost Gas Sensing: Dynamic Self-Compensation of Humidity in CNT-Based Devices.
ACS Sensors ( IF 8.2 ) Pub Date : 2019-12-16 , DOI: 10.1021/acssensors.9b01095
Aniello Falco 1 , Florin C Loghin 2 , Markus Becherer 2 , Paolo Lugli 1 , José F Salmerón 2 , Almudena Rivadeneyra 3
Affiliation  

Solid-state gas sensors are a cost-effective and well-spread alternative to conventional gas sensing, employable in most environments, ranging from homes and offices to harsh industrial scenarios. The emergence of carbon nanotubes (CNTs) as sensing material in solid-state gas sensors paved the way to a new class of devices, which are semitransparent, flexible, and with a remarkably low environmental impact. These devices, however, lack selectivity to other gases and concurring physical phenomena, such as temperature and pressure changes. In this contribution, we show how by measuring the impedance of CNT-based gas sensors at different frequencies, it is possible to evaluate sensitivity coefficient for the immediate compensation of moisture content in the air, while still preserving in the considered ranges of average sensitivities as high as 0.045, 0.112, 7.842 × 10-5, and 0.041 % Z/ppm for ammonia, carbon dioxide, carbon monoxide and ethanol gas, respectively. With this simple approach, it will be possible to develop simple sensor read-out systems, with reduced external electronic, simplifying the route to low-cost and low-power sensor nodes for the internet of things.

中文翻译:

低成本气体感应:基于CNT的设备中湿度的动态自补偿。

固态气体传感器是传统气体传感的一种经济高效且广泛使用的替代产品,可在大多数环境中使用,从家庭和办公室到恶劣的工业场景。碳纳米管(CNTs)作为固态气体传感器中的传感材料的出现为新型设备提供了道路,该设备是半透明的,柔性的并且对环境的影响极低。但是,这些设备对其他气体和同时发生的物理现象(例如温度和压力变化)缺乏选择性。在这项贡献中,我们展示了如何通过测量基于CNT的气体传感器在不同频率下的阻抗,可以评估灵敏度系数以立即补偿空气中的水分,同时仍保持在考虑的平均灵敏度范围内,如高达0.045,氨,二氧化碳,一氧化碳和乙醇气体的Z / ppm分别为0.112、7.842×10-5和0.041%Z / ppm。通过这种简单的方法,将有可能开发出简单的传感器读出系统,减少外部电子设备,从而简化通往物联网的低成本和低功率传感器节点的路线。
更新日期:2019-12-17
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