Abstract
The gas sensing properties of two novel series of Mg-incorporated metal–organic frameworks (MOFs), termed Mg-MOFs-I and -II, were assessed. The synthesized iso-reticular type Mg-MOFs exhibited good crystallinity, high thermal stability, needle-shape morphology and high surface area (up to 2900 m2·g−1), which are promising for gas sensing applications. Gas-sensing studies of gas sensors fabricated from Mg-MOFs-II revealed better sensing performance, in terms of the sensor dynamics and sensor response, at an optimal operating temperature of 200 °C. The MOF gas sensor with a larger pore size and volume showed shorter response and recovery times, demonstrating the importance of the pore size and volume on the kinetic properties of MOF-based gas sensors. The gas-sensing results obtained in this study highlight the potential of Mg-MOFs gas sensors for the practical monitoring of toxic gases in a range of environments.
Highlights
Metal–organic frameworks (MOFs) are a class of hybrid crystalline materials constructed by the appropriate combination of metal clusters and organic linkers that form infinite structures with high porosity, stability, and chemical tenability [1,2,3]
The obtained performance of gas sensors fabricated from the Mg-MOFs indicates their potential use in the environmental monitoring of toxic gases
The detail of the synthesis procedure of Mg-MOFs- II is as follows: Mg(NO3 )2 ·6H2 O (87.0 mg, 0.340 mmol) and H4 ODA (30 mg, 0.083 mmol) were dissolved in a 20 mL glass vial containing 7.50 mL of DMF combining with 0.50 mL of ethanol and 0.50 mL of deionized water, and heat-treated and activated under the same condition applied to Mg-MOF-I
Summary
Metal–organic frameworks (MOFs) are a class of hybrid crystalline materials constructed by the appropriate combination of metal clusters and organic linkers that form infinite structures with high porosity, stability, and chemical tenability [1,2,3]. To exploit these advantageous properties, many MOFs have been designed and tailored to a variety of applications, including gas separation and storage [4], conductivity [5], catalysis [6], and drug delivery [7]. The obtained performance of gas sensors fabricated from the Mg-MOFs indicates their potential use in the environmental monitoring of toxic gases
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