Improving Sensitivity of a Chemoresistive Hydrogen Sensor by Combining ZIF-8 and ZIF-67 Nanocrystals

Matatagui, Daniel; Sainz-Vidal, Arianee; Gràcia, I.; Figueras, E.; Cané, C.; Sániger, José M.

doi:10.3390/proceedings1040462

Cited by 5 publications

(7 citation statements)

References 4 publications

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“…Yang et al fabricated a fluorescent chemical nanoprobe sensor for alcohols by encapsulating HDBB molecules into the nanochannel of ZIF-8 [32]. Zhan et al developed a polyhedral ZIF-8 nanostructures by applying a solvothermal method and reported excellent NO 2 gassensing, while Matatagui developed a chemoresistive gas sensor by merging nanostructures of ZIF-67 and ZIF-8 [33,34]. Lin et al encapsulated branched poly-(ethylenimine)-capped carbon quantum dots (BPEI-CQDs) characterized by high FL quantum yield into ZIF-8.…”

Section: Zif-8 Applicationsmentioning

confidence: 99%

Life Cycle Assessment on Different Synthetic Routes of ZIF-8 Nanomaterials

et al. 2021

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In the last twenty years, research activity around the environmental applications of metal–organic frameworks has bloomed due to their CO2 capture ability, tunable properties, porosity, and well-defined crystalline structure. Thus, hundreds of MOFs have been developed. However, the impact of their production on the environment has not been investigated as thoroughly as their potential applications. In this work, the environmental performance of various synthetic routes of MOF nanoparticles, in particular ZIF-8, is assessed through a life cycle assessment. For this purpose, five representative synthesis routes were considered, and synthesis data were obtained based on available literature. The synthesis included different solvents (de-ionized water, methanol, dimethylformamide) as well as different synthetic steps (i.e., hours of drying, stirring, precursor). The findings revealed that the main environmental weak points identified during production were: (a) the use of dimethylformamide (DMF) and methanol (MeOH) as substances impacting environmental sustainability, which accounted for more than 85% of the overall environmental impacts in those synthetic routes where they were utilized as solvents and as cleaning agents at the same time; (b) the electricity consumption, especially due to the Greek energy mix which is fossil-fuel dependent, and accounted for up to 13% of the overall environmental impacts in some synthetic routes. Nonetheless, for the optimization of the impacts provided by the energy use, suggestions are made based on the use of alternative, cleaner renewable energy sources, which (for the case of wind energy) will decrease the impacts by up to 2%.

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Section: Zif-8 Applicationsmentioning

confidence: 99%

Life Cycle Assessment on Different Synthetic Routes of ZIF-8 Nanomaterials

et al. 2021

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“…A certain Lewis basicity originates from the coordination Me-N [ 66 ], but the presence of defects in the framework structure is also an important source of acid–base sites in both ZIF-67 and ZIF-8, as described by Naz et al In their work, the amount of basic sites in ZIF-67 and ZIF-8, evaluated as a result of a CO 2 TPD characterization, was reported to be 5.25 µmol/g and 4.99 µmol/g, respectively [ 67 ]. The framework of ZIF-67 and ZIF-8 is sodalite type and presents pores of 11.6 Å connected through eight six-membered ring windows of 3.4 Å and six four-membered ring small pores of 0.8 Å [ 68 , 69 , 70 ]. The substituted ZIF-67 presents the same crystalline structure except for a contraction observed from the XRD pattern, which indicates a reduction in the d-spacing due to the exchanged linkers.…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic Frameworks as Formose Reaction Catalysts with Enhanced Selectivity

Balloi,

Diaz-Perez,

Lara-Angulo

et al. 2023

Molecules

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The formose reaction is an autocatalytic series of aldol condensations that allows one to obtain monosaccharides from formaldehyde. The formose reaction suffers from a lack of selectivity, which hinders practical applications at the industrial level. Over the years, many attempts have been made to overcome this selectivity issue, with modest results. Heterogeneous porous catalysts with acid–base properties, such as Metal–Organic Frameworks (MOFs), can offer advantages compared to homogeneous strong bases (e.g., calcium hydroxide) for increasing the selectivity of this important reaction. For the very first time, four different Zeolite Imidazolate Frameworks are presented in this work as catalysts for the formose reaction in liquid phase, and their catalytic performances were compared with those of the typical homogeneous catalyst (i.e., calcium hydroxide). The heterogeneous nature of the catalysis, the possible contribution of leached metal or linkers to the solution, and the stability of the materials were investigated. The porous structure of these solids and their mild basicity make them suitable for obtaining enhanced selectivity at 30% formaldehyde conversion. Most of the MOFs tested showed low structural stability under reaction conditions, thereby indicating the need to search for new MOF families with higher robustness. However, this important result opens the path for future research on porous heterogeneous basic catalysts for the formose reaction.

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“…ZIF-8 (Zn(mIm) 2 , where mIm is 2-methylimidazole) displays a 3D sodalite (sod) topography with a space group of interconnected six-membered rings with a pore size of 11.6 Å and a diameter of 3.4 Å. ZIF-8 is found to have 276 atoms in each unit cell [48]. Three-dimensional structure of ZIF-8 in the cubic unit cell is presented in Figure 1, and ZIF-8 consist of 2-methyl-imidazolate (MeIM) groups linking tetracoordinated Zn 2+ metal ions [49].…”

Section: Introductionmentioning

confidence: 99%

Recent Research Trends on Zeolitic Imidazolate Framework-8 and Zeolitic Imidazolate Framework-67-Based Hybrid Nanocomposites for Supercapacitor Application

Chhetri,

Adhikari,

Kunwar

et al. 2023

International Journal of Energy Research

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Recently, Zeolitic Imidazolate Frameworks (ZIFs) and their hybrid composites have incited a lot of interest in the research community and have shown promising potential in supercapacitors owing to their excellent conductivity, high surface area, tunable structure, rich redox chemistry, composition diversity, etc. Even though many ZIFs are being studied for the advancement of electrode materials used for energy storage applications, in this review, we are focused on ZIF-8 and ZIF-67 only. The electrochemical performance of pure ZIFs is poor due to low electronic conductivity and poor cycling life. To counter this, ZIFs are mixed with other materials like conducting polymers, other transitional metals composites, and activated carbons to prepare hybrid composites. Furthermore, the highly porous structure and large surface area of the ZIFs cage act as an ideal template for designing composites with excellent supercapacitor applications. This reviewis focus on the synthesis and electrochemical performance of such materials. This review is divided into two main parts: the design and synthesis of ZIF-8 and ZIF-67 derivatives for supercapacitor applications and the electrochemical performance of ZIF-8 and ZIF-67-based derivatives in three-electrode and two-electrode setups. Lastly, the challenges and obstacles encountered while employing ZIF-8 and ZIF-67-based composites in supercapacitors will be reviewed and commented on.

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Improving Sensitivity of a Chemoresistive Hydrogen Sensor by Combining ZIF-8 and ZIF-67 Nanocrystals

Cited by 5 publications

References 4 publications

Life Cycle Assessment on Different Synthetic Routes of ZIF-8 Nanomaterials

Life Cycle Assessment on Different Synthetic Routes of ZIF-8 Nanomaterials

Metal–Organic Frameworks as Formose Reaction Catalysts with Enhanced Selectivity

Recent Research Trends on Zeolitic Imidazolate Framework-8 and Zeolitic Imidazolate Framework-67-Based Hybrid Nanocomposites for Supercapacitor Application

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