An 860 MHz Wireless Surface Acoustic Wave Sensor with a Metal-Organic Framework Sensing Layer for CO2 and CH4

Journal Article · Tue Apr 28 00:00:00 EDT 2020 · IEEE SENSORS JOURNAL

DOI:https://doi.org/10.1109/JSEN.2020.2990997· OSTI ID:1771060

Devkota, Jagannath ^[1]; Greve, David; Hong, Tao ^[2]; Kim, Ki-Joong ^[1]; Ohodnicki, Paul ^[3]

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1. AECOM
2. Materials Characterization Team
3. NETL

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.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE Office of Fossil Energy (FE)
• OSTI ID: 1771060
• Report Number(s): NA
• Journal Information: IEEE SENSORS JOURNAL, Journal Name: IEEE SENSORS JOURNAL Journal Issue: 17 Vol. 20; ISSN 1558-1748
• Country of Publication: United States
• Language: English