Synthesis of core-shell flower-like WO3@ZIF-71 with enhanced response and selectivity to H2S gas

Zhou, Ying; Zhou, Tingting; Zhang, Yipeng; Tang, Li; Guo, Qing; Wang, Mingfeng; Xie, Conghua; Zeng, Dawen

doi:10.1016/j.ssi.2020.115278

Cited by 34 publications

(16 citation statements)

References 31 publications

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“…In contrast, for ZIF-71 coatings with larger pore opening (0.48 nm, green bars), ethanol and acetone pass through and even show slightly higher sensor response than the uncoated sensor. Such increased responses were also observed for H 2 S on ZIF-71 covered WO 3 sensors 230 and were attributed to enhanced analyte adsorption onto the ZIF-71. 231 Besides framework composition, the pore size of MOFs 232 and zeolites 233 can also be adjusted by encapsulation of ions or nanoparticles in their pores.…”

Section: Pore-size Controlmentioning

confidence: 56%

Highly selective gas sensing enabled by filters

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Section: Pore-size Controlmentioning

confidence: 56%

Highly selective gas sensing enabled by filters

et al. 2021

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“…There are many sources and preparation methods of SMOx that can be used as active sensing materials, so we will not explain in much detail. The metal ion source and organic ligand source are essential for the preparation of MOF, thus the metal source of MOF is crucial for the successful synthesis of SMOx and MOF composites [88]. At present, few studies on SMOx and MOF composites have been reported because there are only a few sources of metals used for the initial conversion of MOF.…”

Section: Selection Of Composite Materials With Smox and Mofmentioning

confidence: 99%

“…Additionally, the use of ZnO can be used as a substrate for the coating of MOF materials in addition to being a source of providing zinc ions, and it was found that the morphology and size of the coreshell heterostructures of MOFs can be directly controlled by the template [80,90,105,106]. For other metal compounds such as In 2 O 3 and WO 3 , the researchers found that the MOF materials were also doped with ZnO inside the oxide or pretreated with ZnO on the surface before synthesizing the composites [53,88].…”

Section: Selection Of Composite Materials With Smox and Mofmentioning

confidence: 99%

“…Although the presence of ZnS was not proved directly, the results of N2 comparison experiments presented evidence. Ying Zhou et al [88] successfully synthesized the flower-like WO3@ZIF-71, and the sensors demonstrated improved performance in selectivity and response to H2S. Apart from the limitation of ZIF-71 pore size, they suggested that the improved sens-…”

Section: Exploration Of the Types Of Detection Gasesmentioning

confidence: 99%

“…Although the presence of ZnS was not proved directly, the results of N 2 comparison experiments presented evidence. Ying Zhou et al [88] successfully synthesized the flowerlike WO 3 @ZIF-71, and the sensors demonstrated improved performance in selectivity and response to H 2 S. Apart from the limitation of ZIF-71 pore size, they suggested that the improved sensing performance could be caused by the interaction between H 2 S and ZIF-71, i.e., the five-membered C-N heterocycle of the organic ligand in ZIF-71 would enhance the adsorption of H 2 S by the MOF. Gas permeation through the MOF consists of three steps: (1) adsorption of the gas in the MOF, (2) diffusion of the gas within the MOF, and (3) desorption [108].…”

Section: Exploration Of the Types Of Detection Gasesmentioning

confidence: 99%

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Gas sensing materials, such as semiconducting metal oxides (SMOx), carbon-based materials, and polymers have been studied in recent years. Among of them, SMOx-based gas sensors have higher operating temperatures; sensors crafted from carbon-based materials have poor selectivity for gases and longer response times; and polymer gas sensors have poor stability and selectivity, so it is necessary to develop high-performance gas sensors. As a porous material constructed from inorganic nodes and multidentate organic bridging linkers, the metal-organic framework (MOF) shows viable applications in gas sensors due to its inherent large specific surface area and high porosity. Thus, compounding sensor materials with MOFs can create a synergistic effect. Many studies have been conducted on composite MOFs with three materials to control the synergistic effects to improve gas sensing performance. Therefore, this review summarizes the application of MOFs in sensor materials and emphasizes the synthesis progress of MOF composites. The challenges and development prospects of MOF-based composites are also discussed.

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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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Synthesis of core-shell flower-like WO3@ZIF-71 with enhanced response and selectivity to H2S gas

Cited by 34 publications

References 31 publications

Highly selective gas sensing enabled by filters

Highly selective gas sensing enabled by filters

Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance

MOF‐Based Chemiresistive Gas Sensors: Toward New Functionalities

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