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Metal-Organic Framework-Based Colorimetric Gas Sensors Toward an Improved Indoor Air Quality Monitoring.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Metal-Organic Framework-Based Colorimetric Gas Sensors Toward an Improved Indoor Air Quality Monitoring./
作者:	Davey, Adrian.
面頁冊數:	1 online resource (203 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
Contained By:	Dissertations Abstracts International85-03B.
標題:	Atmospheric sciences. -
電子資源:	click for full text (PQDT)
ISBN:	9798380382120

Metal-Organic Framework-Based Colorimetric Gas Sensors Toward an Improved Indoor Air Quality Monitoring.
Davey, Adrian.

Metal-Organic Framework-Based Colorimetric Gas Sensors Toward an Improved Indoor Air Quality Monitoring. - 1 online resource (203 pages)

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

Thesis (Ph.D.)--University of California, Berkeley, 2023.

Includes bibliographical references

As respiratory illness infections and related environmental antagonisms continue to beleaguer our contemporary moment, the construction of low-cost, scalable, highly sensitive, remarkably selective, ultralow power, and user-friendly technologies for detecting hazardous chemical species indoors remains imperative. Namely, the accumulation of carbon dioxide (CO2) and select volatile organic compounds (VOCs) in indoor settings is associated with deleterious human health conditions, such as fatigue, headaches, and irritation of the throat. While commercialized indoor gas detectors exhibit desirable analyte sensitivity and long-term sensing endurance, these devices characteristically suffer from cost, bulk, and power requirements. Toward addressing these limitations, this work introduces amine-functionalized, dye-loaded metal-organic framework (MOF)-based chemical sensors whose color change upon exposure to indoor analytes produces a more passive, smaller, cheaper, and simpler alternative to existing technologies. In this dissertation, the iterative synthesis and spectroscopic characterization of color-based, MOF-based indoor analyte sensors are accomplished toward the realization of an ideal sensor for an improved indoor air quality monitoring. Chapter 1 situates the relationship among indoor CO2 and indoor VOCs in the ongoing Coronavirus disease 2019 (COVID-19) pandemic, illustrating the range of detrimental realities for human and environmental health. To best articulate the stakes of structured public health violence, the chapter engages an interdisciplinary analysis of power in which antiblack worldbuilding is linked to previous, present, and emerging environmental violence and human unwellness. Once certain predatory formations are more concretely assigned answerability for air-based violence, the chapter closes with attendant scientific interventions and provides the rationale for the development of color-based chemical sensors to preempt adverse exposures to indoor analytes.Chapter 2 introduces a first-generation colorimetric gas sensor composed of a MOF, primary amine, dye, and methanol blended, drop-cast on cellulose filter paper, and exposed to indoor levels of CO2 (700 parts per million, ppm, and up). Here, the pristine MOF-the zeolitic imidazolate framework-8 (ZIF-8) consisting of zinc (Zn2+) cations tetrahedrally coordinated by 2-methylimidazolate (Hmim¬-) organic linkers-serves as the highly-porous adsorbent with known physisorptive affinity to CO¬2. Following its unstirred, room temperature synthesis, ZIF-8 is blended with the primary amine, ethylenediamine (ED), and the dye, phenolsulfonpthalein (PSP, or phenol red). The capacity of the resulting sensor, termed PSP-ED/ZIF-8, to effectively function in plausible indoor air conditions is probed via several characterization techniques. Powder X-ray diffraction (PXRD) is used to demonstrate the long-term chemical stability of ZIF-8 in the basic environment created from the addition of ethylenediamine. Moreover, scanning electron microscopy (SEM) is used to define the morphological properties of PSP-ED/ZIF-8 in relation to the molar ratio of the ZIF-8 metal : ZIF-8 linker : methanolic solvent precursors, as well as the post-synthetically incorporated colorimetric ingredients. A LabView-enabled gas dosing apparatus (coupled with a nondispersive infrared, NDIR, gas sensor to substantiate gas levels, humidity, and temperature) is implemented to deliver a range of CO2 levels (700-7,500 ppm) under various humidity (0-80% RH) at room temperature to PSP-ED/ZIF-8 drop-cast on cellulose filter paper. Through smartphone video recording, qualitative assays of gas-exposed PSP-ED/ZIF-8 are collected, with an increasing intensity of the fuchsia-to-yellow color change observed with increased concentrations of CO2. In realizing that the perceived color change is only permissible in the presence of the MOF, Brunaeur-Emmett-Teller (BET) surface area analysis is performed to evaluate the role of high surface area on ZIF-8's ability to accommodate both ethylenediamine and phenol red, as well as provide sorption sites for indoor CO2. Finally, an ex-situ ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopic technique is achieved to quantify how the Kubelka-Munk, F(R), values at 443 and 570 nm resonant with phenol red change relative to each other as the concentration of CO2 and humidity levels are modified. Despite immediate and increasing responses of PSP-ED/ZIF-8 to 700 ppm CO2 (and up) in dry environment, qualitative color assays and quantitative UV-Vis measurements exhibit a largely suppressed color change in the presence of humidity. To improve the colorimetric gas response across humidity, a revised sensor recipe is accomplished.In Chapter 3, an enhanced colorimetric indoor CO2 sensor is attained through the direct incorporation of phenol red into the ZIF-8 metal and linker precursor broth. The orange crystals formed, PSP:ZIF-8, are then blended with ethylenediamine to form a second-generation sensor, ED/PSP:ZIF-8. Collected PXRD patterns, as well as Fourier transform infrared (FTIR) spectroscopic transmittance scans, confirm the structural integrity of ZIF-8 in both PSP:ZIF-8 and ED/PSP:ZIF-8. In addition, SEM and transmission electron microscopy (TEM) demonstrate the fourfold increase in size of ZIF-8 crystals upon growth in a phenol red-loaded. (Abstract shortened by ProQuest).

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380382120Subjects--Topical Terms:

1179392
Atmospheric sciences.
Subjects--Index Terms:

Colorimetric gas sensingIndex Terms--Genre/Form:

554714
Electronic books.

Metal-Organic Framework-Based Colorimetric Gas Sensors Toward an Improved Indoor Air Quality Monitoring.
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Toward addressing these limitations, this work introduces amine-functionalized, dye-loaded metal-organic framework (MOF)-based chemical sensors whose color change upon exposure to indoor analytes produces a more passive, smaller, cheaper, and simpler alternative to existing technologies. In this dissertation, the iterative synthesis and spectroscopic characterization of color-based, MOF-based indoor analyte sensors are accomplished toward the realization of an ideal sensor for an improved indoor air quality monitoring. Chapter 1 situates the relationship among indoor CO2 and indoor VOCs in the ongoing Coronavirus disease 2019 (COVID-19) pandemic, illustrating the range of detrimental realities for human and environmental health. To best articulate the stakes of structured public health violence, the chapter engages an interdisciplinary analysis of power in which antiblack worldbuilding is linked to previous, present, and emerging environmental violence and human unwellness. Once certain predatory formations are more concretely assigned answerability for air-based violence, the chapter closes with attendant scientific interventions and provides the rationale for the development of color-based chemical sensors to preempt adverse exposures to indoor analytes.Chapter 2 introduces a first-generation colorimetric gas sensor composed of a MOF, primary amine, dye, and methanol blended, drop-cast on cellulose filter paper, and exposed to indoor levels of CO2 (700 parts per million, ppm, and up). Here, the pristine MOF-the zeolitic imidazolate framework-8 (ZIF-8) consisting of zinc (Zn2+) cations tetrahedrally coordinated by 2-methylimidazolate (Hmim¬-) organic linkers-serves as the highly-porous adsorbent with known physisorptive affinity to CO¬2. Following its unstirred, room temperature synthesis, ZIF-8 is blended with the primary amine, ethylenediamine (ED), and the dye, phenolsulfonpthalein (PSP, or phenol red). The capacity of the resulting sensor, termed PSP-ED/ZIF-8, to effectively function in plausible indoor air conditions is probed via several characterization techniques. Powder X-ray diffraction (PXRD) is used to demonstrate the long-term chemical stability of ZIF-8 in the basic environment created from the addition of ethylenediamine. Moreover, scanning electron microscopy (SEM) is used to define the morphological properties of PSP-ED/ZIF-8 in relation to the molar ratio of the ZIF-8 metal : ZIF-8 linker : methanolic solvent precursors, as well as the post-synthetically incorporated colorimetric ingredients. A LabView-enabled gas dosing apparatus (coupled with a nondispersive infrared, NDIR, gas sensor to substantiate gas levels, humidity, and temperature) is implemented to deliver a range of CO2 levels (700-7,500 ppm) under various humidity (0-80% RH) at room temperature to PSP-ED/ZIF-8 drop-cast on cellulose filter paper. Through smartphone video recording, qualitative assays of gas-exposed PSP-ED/ZIF-8 are collected, with an increasing intensity of the fuchsia-to-yellow color change observed with increased concentrations of CO2. In realizing that the perceived color change is only permissible in the presence of the MOF, Brunaeur-Emmett-Teller (BET) surface area analysis is performed to evaluate the role of high surface area on ZIF-8's ability to accommodate both ethylenediamine and phenol red, as well as provide sorption sites for indoor CO2. Finally, an ex-situ ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopic technique is achieved to quantify how the Kubelka-Munk, F(R), values at 443 and 570 nm resonant with phenol red change relative to each other as the concentration of CO2 and humidity levels are modified. Despite immediate and increasing responses of PSP-ED/ZIF-8 to 700 ppm CO2 (and up) in dry environment, qualitative color assays and quantitative UV-Vis measurements exhibit a largely suppressed color change in the presence of humidity. To improve the colorimetric gas response across humidity, a revised sensor recipe is accomplished.In Chapter 3, an enhanced colorimetric indoor CO2 sensor is attained through the direct incorporation of phenol red into the ZIF-8 metal and linker precursor broth. The orange crystals formed, PSP:ZIF-8, are then blended with ethylenediamine to form a second-generation sensor, ED/PSP:ZIF-8. Collected PXRD patterns, as well as Fourier transform infrared (FTIR) spectroscopic transmittance scans, confirm the structural integrity of ZIF-8 in both PSP:ZIF-8 and ED/PSP:ZIF-8. In addition, SEM and transmission electron microscopy (TEM) demonstrate the fourfold increase in size of ZIF-8 crystals upon growth in a phenol red-loaded. (Abstract shortened by ProQuest).
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