Thin Films of an Ultrastable Metal–Organic Framework for Formic Acid Sensing with High Selectivity and Excellent Reproducibility

Li, Meng; Zhang, Jin; Kong, Ya-Ru; Luo, Hong-Bin; Liu, Yangyang; Ren, Xiao‐Ming

doi:10.1021/acsmaterialslett.1c00455

Cited by 17 publications

(7 citation statements)

References 35 publications

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“…[236][237][238][239] In addition, ion conductive MOFs with measurable conduction ranges have been noted to be suitable for gas-sensing materials. Liu et al [240] reported formic acid gas sensors based on proton conductive MOF-802 operating at room temperature, which are composed of Zr 6 (µ 3 -O) 4 (µ 3 -OH) 4 metal nodes and 1H-pyrazole-3,5-dicarboxylate (PZDC) organic linkers. The ion conduction was attributable to the ionization of OH and COOH groups in metal clusters and generation of proton.…”

Section: Ionically Conductive Metal-organic Framework For Gas Sensorsmentioning

confidence: 99%

MOF‐Based Chemiresistive Gas Sensors: Toward New Functionalities

Lee

et al. 2023

Advanced Materials

145

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The sensing performances of gas sensors must be improved and diversified to enhance quality of life by ensuring health, safety, and convenience. Metal–organic frameworks (MOFs), which exhibit an extremely high surface area, abundant porosity, and unique surface chemistry, provide a promising framework for facilitating gas‐sensor innovations. Enhanced understanding of conduction mechanisms of MOFs has facilitated their use as gas‐sensing materials, and various types of MOFs have been developed by examining the compositional and morphological dependences and implementing catalyst incorporation and light activation. Owing to their inherent separation and absorption properties and catalytic activity, MOFs are applied as molecular sieves, absorptive filtering layers, and heterogeneous catalysts. In addition, oxide‐ or carbon‐based sensing materials with complex structures or catalytic composites can be derived by the appropriate post‐treatment of MOFs. This review discusses the effective techniques to design optimal MOFs, in terms of computational screening and synthesis methods. Moreover, the mechanisms through which the distinctive functionalities of MOFs as sensing materials, heterostructures, and derivatives can be incorporated in gas‐sensor applications are presented.

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Section: Ionically Conductive Metal-organic Framework For Gas Sensorsmentioning

confidence: 99%

MOF‐Based Chemiresistive Gas Sensors: Toward New Functionalities

Lee

et al. 2023

Advanced Materials

145

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“…The widespread adoption of H 2 as a fuel alternative coupled with its transport in the masked form of FA, necessitates leak prevention and thus innovation in the space of sensitive detection. A sensor capable of FA detection might also serve as a first step in the development of a direct H 2 probe, which could be coupled to any one of a series of existing catalysts, that are capable of CO 2 hydrogenation. , Existing FA detection methods rely on conventional chromatography, as well as the use of thin films containing metal–organic frameworks (MOFs), in addition to other materials that provide an electrochemical or optical output. − …”

Section: Introductionmentioning

confidence: 99%

An Azomethine-H-Based Fluorogenic Sensor for Formic Acid

Potter,

Debnath,

Drover

et al. 2023

ACS Appl. Mater. Interfaces

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Formic acid (FA) is an important C 1 -containing feedstock that serves as a masked source of dihydrogen gas (H 2 ). To encourage the adoption of cleaner (noncarbonaceous) energy sources, FA detection and sensing is thus of considerable interest. Here, we examine the use of a commercially available dye, azomethine-H (Az-H), for FA sensing. Solution studies confirm that FA quenches both the absorbance and the luminescence properties of Az-H. FA was additionally found to attenuate a known Az-H (E)-to-(Z) conformational change, suggesting an Az-H/FA interaction, possibly through hydrogen bonding; this phenomenon was probed using 1 H NMR spectroscopy. Moving toward a solidstate sensor, the Az-H probe was incorporated into a gelatin-based matrix. On exposure to FA, the luminescence of this system was found to increase in a FA-dependent manner, attributed to the formation of stable hydrogen-bonded structures, facilitating a (Z)-to-(E) isomerization via imine protonation, allowing for production of the more luminescent (E)-isomer. This fluorogenic signal was used as a FA sensor with an estimated detection limit of ca. 0.4 ppb FA vapor. This work constitutes an important step toward a highly sensitive FA sensor in both the solution and solid state, opening new space for the detection of organic acids in differing chemical environments.

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“…12,17 Therefore, the development of Zr-MOFs and relevant materials becomes a promising strategy for the direct use of MOFs in aqueous applications such as electrochemical sensors. 18,19 Among various electrochemical sensing purposes, the electrochemical detection of dopamine (DA) is particularly of interest, since DA is a crucial neurochemical in the human body and an electrochemical method can provide a rapid detection and ease of miniaturization. 20−23 Various recent studies have thus utilized water-stable MOF-based materials, including some Zr-MOFs, in the electrochemical detection of DA.…”

mentioning

confidence: 99%

“…As emerging nanoporous materials with fascinating properties including the ultrahigh specific surface area, interconnected porosity, and tunable intraframework chemical functionality, , metal–organic frameworks (MOFs) have been widely reported for diverse applications over the past two decades. − The spatially separated and highly accessible active sites can be immobilized within the entire framework by rational designing the MOF structure or postsynthetic modification, , which renders MOFs especially attractive for catalysis and chemical sensors. − Although their poor chemical stability limits the direct use of most MOFs in a range of applications that require the operations in aqueous environments, MOFs constructed from group(IV) metal-based nodes, e.g., zirconium-based MOFs (Zr-MOFs), have been known for their extraordinary chemical stability and opened up the opportunities for utilizing such versatile materials in aqueous media. , Therefore, the development of Zr-MOFs and relevant materials becomes a promising strategy for the direct use of MOFs in aqueous applications such as electrochemical sensors. , …”

mentioning

confidence: 99%

Sulfonate-Grafted Metal–Organic Framework─A Porous Alternative to Nafion for Electrochemical Sensors

Shen

Chang

Chen

et al. 2023

ACS Materials Lett.

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Nafion, a polymer containing negatively charged sulfonate groups, is commonly used as a thin film cast on the electrode to adjust the selectivity of complicated electrochemical reactions involving charged reactants or analytes in the electrochemical sensing and electrolytic systems. Herein, a highly porous and chemically stable metal–organic framework (MOF) with enriched sulfonate groups in its pores is synthesized by performing the postsynthetic immobilization of the sulfonate-based ligand within a zirconium-based MOF, MOF-808, and the resulting sulfonate-grafted MOF (SO3-MOF-808) is proposed as a “porous Nafion”an appealing alternative to the conventional Nafion coating for modulating the selectivity of electrochemical reactions. As a demonstration, the electrochemical sensing of dopamine (DA), which usually suffers from interference caused by the oxidation of the coexisting negatively charged ascorbic acid (AA) and uric acid (UA), is implemented. With the use of the SO3-MOF-808 thin film deposited on the active electrode surface, both the current signal for DA oxidation and the selectivity toward the oxidation of DA against those of AA and UA remarkably outperform those achieved by the Nafion thin film with an optimized film thickness. Findings here suggest the new role of such sulfonate-grafted MOFs as an advanced alternative to Nafion in a range of electrochemical sensing systems and other complicated electrochemical reactions.

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Thin Films of an Ultrastable Metal–Organic Framework for Formic Acid Sensing with High Selectivity and Excellent Reproducibility

Cited by 17 publications

References 35 publications

MOF‐Based Chemiresistive Gas Sensors: Toward New Functionalities

MOF‐Based Chemiresistive Gas Sensors: Toward New Functionalities

An Azomethine-H-Based Fluorogenic Sensor for Formic Acid

Sulfonate-Grafted Metal–Organic Framework─A Porous Alternative to Nafion for Electrochemical Sensors

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