Amine-functionalized metal-organic framework ZIF-8 toward colorimetric CO2 sensing in indoor air environment

Davey, Adrian K.; Gao, Xiang; Xia, Yong; Li, Zhou; Dods, Matthew N.; Delacruz, Steven; Pan, Aifei; Swamy, Sanket; Gardner, David; Carraro, Carlo; Maboudian, Roya

doi:10.1016/j.snb.2021.130313

Title: Amine-functionalized metal-organic framework ZIF-8 toward colorimetric CO₂ sensing in indoor air environment

Journal Article · Fri Jun 18 00:00:00 UTC 2021 · Sensors and Actuators. B, Chemical

DOI: https://doi.org/10.1016/j.snb.2021.130313 · OSTI ID:1977647

^[1]; Gao, Xiang ^[2]; Xia, Yong ^[2];

^[2]; Dods, Matthew N. ^[3];

^[2]; Pan, Aifei ^[2]; Swamy, Sanket ^[3]; Gardner, David ^[2];

^[2];

^[2]

University of California, Berkeley, CA (United States); Berkeley Sensor & Actuator Center, Berkeley, CA (United States); OSTI
University of California, Berkeley, CA (United States); Berkeley Sensor & Actuator Center, Berkeley, CA (United States)
University of California, Berkeley, CA (United States)

Carbon dioxide (CO₂) has been shown to contribute to human health consequences indoors, such as shortness of breath, nasal and optic irritation, dizziness, and nausea. Here in this work, we explore the potential of metal–organic frameworks (MOFs) as highly-porous, crystalline sorbents for sensitive colorimetric CO₂ detection. In particular, the zeolitic imidazolate framework (ZIF-8) is chosen as the sorptive material due to its chemical stability and tunable CO₂ affinity. The colorimetric gas sensor is developed in methanol with three components: (i) MOF ZIF-8 as a high surface area adsorbent; (ii) ethylenediamine (ED) as the CO₂-affinitive basic function; and (iii) phenolsulfonpthalein (PSP) as the pH indicator. Colorimetric assays and ratiometric analysis confirm a colorimetric response to variable CO₂ concentrations of relevance to indoor air quality. The color response is attributed to a zwitterion mechanism whereby ED reacts with CO₂ to form a zwitterionic intermediate. This intermediate is then deprotonated by the pH indicator, shifting the pH and inducing a color change. Given its simple fabrication, rapid and obvious response, and stability in ambient environment, the ZIF-8-based colorimetric sensor provides a promising route for an improved indoor air quality monitoring.

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Research Organization:: University of California, Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; SC0019992

OSTI ID:: 1977647

Journal Information:: Sensors and Actuators. B, Chemical, Journal Name: Sensors and Actuators. B, Chemical Journal Issue: C Vol. 344; ISSN 0925-4005

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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MOF
RGB value
ZIF
Zwitterion mechanism
air quality monitoring
colorimetric sensing
metal-organic framework
zeolitic imidazolate framework

Title: Amine-functionalized metal-organic framework ZIF-8 toward colorimetric CO2 sensing in indoor air environment

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References (81)

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Title: Amine-functionalized metal-organic framework ZIF-8 toward colorimetric CO₂ sensing in indoor air environment