论文标题
一个860 MHz无线表面声波传感器，带有金属有机框架感应层，用于CO2和CH4
An 860 MHz Wireless Surface Acoustic Wave Sensor with a Metal-Organic Framework Sensing Layer for CO2 and CH4
论文作者
论文摘要
带有纳米多孔金属有机框架（MOF）传感层的无线和被动表面声波（SAW）设备是在许多领域（例如能源工业和空气污染控制）应用的有吸引力的气体传感器。在这里，我们报告了在环境条件下提高敏感性检测二氧化碳（CO2）和甲烷（CH4）的敏感工作频率，在环境条件下增加了沸点咪唑酸框架8（ZIF-8）锯齿状锯齿状锯齿状锯齿状延迟线质量传感器的灵敏度和检测极限。特别是，与430 MHz（8-μm周期性）相比，涂有240 nm厚的ZIF-8的反射延迟线的敏感性至少提高了至少四倍的敏感性（4μm周期性），其反射延迟线覆盖了240 nm厚的ZIF-8。 CO2和CH4的较高频率无线设备的检测限量分别为0.91 vol-％和7.01 vol-％。用频率依赖性的声波能量限制来解释对较高频率设备的灵敏度增强。
Wireless and passive surface acoustic wave (SAW) devices with nanoporous metal-organic framework (MOF) sensing layers are attractive gas sensors for applications in many fields such as energy industries and air pollution control. Here, we report on enhancing the sensitivity and detection limit of zeolitic imidazolate framework-8 (ZIF-8) MOF-coated SAW reflective delay line mass sensors by increasing the operating frequency for sensitive detection of carbon dioxide (CO2) and methane (CH4) at ambient conditions. In particular, we show at least four times higher sensitivity of an 860 MHz (4-μm periodicity) SAW reflective delay line coated with a 240 nm thick ZIF-8 compared to the sensitivity of a 430 MHz (8-μm periodicity) otherwise identical sensor device to the targeted gases. The detection limits of the higher frequency wireless devices for CO2 and CH4 were estimated to be 0.91 vol-% and 7.01 vol-%, respectively. The enhanced sensitivity for higher frequency devices is explained in terms of the frequency dependent acoustic wave energy confinement.
