Title: Zeolitic imidazolate framework-coated acoustic sensors for room temperature detection of carbon dioxide and methane

Abstract

The integration of nanoporous materials such as metal organic frameworks (MOFs) with sensitive transducers can result in robust sensing platforms for monitoring gases and chemical vapors for a range of applications. Here, we report on an integration of the zeolitic imidazolate framework – 8 (ZIF-8) MOF with surface acoustic wave (SAW) and thickness shear mode quartz crystal microbalance (QCM) devices to monitor carbon dioxide (CO₂) and methane (CH₄) under ambient conditions. The MOF was directly coated on the Y-Z LiNbO₃ SAW delay lines (operating frequency, f₀ = 436 MHz) and AT-cut quartz TSM resonators (resonant frequency, f₀ = 9 MHz) and the devices were tested for various gases in N₂ under ambient conditions. The devices were able to detect the changes in CO₂ or CH₄ concentrations with relatively higher sensitivity to CO₂, which was due to its higher adsorption potential and heavier molecular weight. The sensors showed full reversibility and repeatability which were attributed to the physisorption of the gases into the MOF and high stability of the devices. Both types of sensors showed linear responses relative to changes in the binary gas compositions thereby allowing to construct calibration curves which correlated well with the expected mass changes in themore » sorbent layer based on mixed-gas gravimetric adsorption isotherms measured on bulk samples. For 200 nm thick films, the SAW sensitivities to CO₂ and CH₄ were 1.44 × 10^-6/vol% and 8 × 10^-8/vol%, respectively, against the QCM sensitivities 0.24 × 10-6/vol% and 1 × 10^-8/vol%, respectively, which were evaluated as the fractional change in the signal. The SAW sensors were also evaluated for 100 nm–300 nm thick films, the sensitivities of which were found to increase with the thickness due to the increased number of pores for the adsorption of a larger amount of gases. Finally, in addition, the MOF-coated SAW delay lines had a good response in wireless mode, demonstrating their potential to operate remotely for the detection of the gases at emission sites across the energy infrastructure.« less

Authors:

Devkota, Jagannath  ^[1];

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Kim, Ki-Joong ^[1]; Ohodnicki, Paul R. ^[2]; Culp, Jeffrey T. ^[1]; Greve, David W. ^[3]; Lekse, Jonathan W. ^[4]

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+ Show Author Affiliations

1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); AECOM Pittsburgh, PA (United States)
2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
3. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Electrical and Computer Engineering; DWGreve Consulting, Sedona, AZ (United States)
4. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)

Publication Date:

Mon Jan 01 00:00:00 EST 2018

Research Org.:

National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)

Sponsoring Org.:

USDOE Office of Fossil Energy (FE)

OSTI Identifier:

1491090

Alternate Identifier(s):

OSTI ID: 1434150

Report Number(s):

CONTR-PUB-514
Journal ID: ISSN 2040-3364; NANOHL

Grant/Contract Number:  

FE0004000

Resource Type:

Accepted Manuscript

Journal Name:

Nanoscale

Additional Journal Information:

Journal Volume: 10; Journal Issue: 17; Journal ID: ISSN 2040-3364

Publisher:

Royal Society of Chemistry

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE