scholarly journals A Low-Power MEMS IDE Capacitor with Integrated Microhotplate: Application as Methanol Sensor using a Metal-Organic Framework Coating as Affinity Layer

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 888 ◽  
Author(s):  
Manjunath Venkatesh ◽  
Sumit Sachdeva ◽  
Brahim El Mansouri ◽  
Jia Wei ◽  
Andre Bossche ◽  
...  
Keyword(s):  
Low Power ◽  
Metal Organic Framework ◽  
Vapor Concentration ◽  
Temperature Dependent ◽  
Zeolitic Imidazolate Framework ◽  
Methanol Vapor ◽  
Silicon Nitride Membrane ◽  
Power Mems ◽  
Metal Organic ◽  
Organic Framework

Capacitors made of interdigitated electrodes (IDEs) as a transducer platform for the sensing of volatile organic compounds (VOCs) have advantages due to their lower power operation and fabrication using standard micro-fabrication techniques. Integrating a micro-electromechanical system (MEMS), such as a microhotplate with IDE capacitor, further allows study of the temperature- dependent sensing response of VOCs. In this paper, the design, fabrication, and characterization of a low-power MEMS microhotplate with IDE capacitor to study the temperature-dependent sensing response to methanol using Zeolitic imidazolate framework (ZIF-8), a class of metal-organic framework (MOF), is presented. A Titanium nitride (TiN) microhotplate with aluminum IDEs suspended on a silicon nitride membrane is fabricated and characterized. The power consumption of the ZIF-8 MOF-coated device at an operating temperature of 50 ∘ C is 4.5 mW and at 200 ∘ C it is 26 mW. A calibration methodology for the effects of temperature of the isolation layer between the microhotplate electrodes and the capacitor IDEs is developed. The device coated with ZIF-8 MOF shows a response to methanol in the concentration range of 500 ppm to 7000 ppm. The detection limit of the sensor for methanol vapor at 20 ∘ C is 100 ppm. In situ study of sensing properties of ZIF-8 MOF to methanol in the temperature range from 20 ∘ C to 50 ∘ C using the integrated microhotplate and IDE capacitor is presented. The kinetics of temperature-dependent adsorption and desorption of methanol by ZIF-8 MOF are fitted with double-exponential models. With the increase in temperature from 20 ∘ C to 50 ∘ C, the response time for sensing of methanol vapor concentration of 5000 ppm decreases by 28%, whereas the recovery time decreases by 70%.

Metal–organic framework-derived CoSe2/(NiCo)Se2 box-in-box hollow nanocubes with enhanced electrochemical properties for sodium-ion storage and hydrogen evolution

2017 ◽  
Vol 5 (35) ◽  
pp. 18823-18830 ◽  
Author(s):  
Seung-Keun Park ◽  
Jin Koo Kim ◽  
Yun Chan Kang
Keyword(s):  
Electrochemical Properties ◽  
Hydrogen Evolution ◽  
Metal Organic Framework ◽  
Sodium Ion ◽  
Zeolitic Imidazolate Framework ◽  
Box Structures ◽  
Ion Storage ◽  
Metal Organic ◽  
Sodium Ion Storage ◽  
Organic Framework

Multishell structured metal selenide nanocubes, namely, Co/(NiCo)Se2 box-in-box structures with different shell compositions, were successfully synthesized by applying zeolitic imidazolate framework-67 (ZIF-67) as a template.

Revealing an unusual temperature-dependent CO2 adsorption trend and selective CO2 uptake over water vapors in a polyamine-appended metal–organic framework

2019 ◽  
Vol 3 (12) ◽  
pp. 2759-2767 ◽  
Author(s):  
Jong Hyeak Choe ◽  
Dong Won Kang ◽  
Minjung Kang ◽  
Hyojin Kim ◽  
Jeoung Ryul Park ◽  
...  
Keyword(s):  
Co2 Adsorption ◽  
Selective Adsorption ◽  
Metal Organic Framework ◽  
Co2 Uptake ◽  
Temperature Dependent ◽  
Water Vapors ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
Unusual Increase ◽  
Organic Framework

Heavily tetraethylenepentamine (tepa)-functionalized Mg2(dobpdc) showed an unusual increase in CO2 uptake on increasing the temperature and selective adsorption of CO2 over water vapors.

A yolk–shell structured metal–organic framework with encapsulated iron-porphyrin and its derived bimetallic nitrogen-doped porous carbon for an efficient oxygen reduction reaction

2020 ◽  
Vol 8 (19) ◽  
pp. 9536-9544 ◽  
Author(s):  
Chaochao Zhang ◽  
Hao Yang ◽  
Dan Zhong ◽  
Yang Xu ◽  
Yanzhi Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Metal Organic Framework ◽  
Reduction Reaction ◽  
Iron Porphyrin ◽  
Zeolitic Imidazolate Framework ◽  
Nitrogen Doped ◽  
Metal Organic ◽  
Organic Framework

A yolk–shell structured metal–organic framework (MOF) with encapsulated 5,10,15,20-tetraphenylporphyrinatoiron (FeTPP) in a zeolitic imidazolate framework (ZIF)-L-ZIF-8 is reported.

scholarly journals Temperature-dependent interchromophoric interaction in a fluorescent pyrene-based metal–organic framework

2019 ◽  
Vol 10 (24) ◽  
pp. 6140-6148 ◽  
Author(s):  
Andrzej Gładysiak ◽  
Tu N. Nguyen ◽  
Richard Bounds ◽  
Anna Zacharia ◽  
Grigorios Itskos ◽  
...  
Keyword(s):  
Variable Temperature ◽  
Metal Organic Framework ◽  
Temperature Dependent ◽  
Fluorescent Emission ◽  
Metal Organic ◽  
Organic Framework

Variable temperature experiments revealed that the fluorescent emission colour of the pyrene-based SION-7 changes from blue at 80 K to yellow-green at 450 K.

Novel metal–organic framework materials: blends, liquids, glasses and crystal–glass composites

2019 ◽  
Vol 55 (60) ◽  
pp. 8705-8715 ◽  
Author(s):  
Joshua M. Tuffnell ◽  
Christopher W. Ashling ◽  
Jingwei Hou ◽  
Shichun Li ◽  
Louis Longley ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Crystal Glass ◽  
Zeolitic Imidazolate Framework ◽  
Feature Article ◽  
Glass Composites ◽  
Framework Materials ◽  
Recent Advances ◽  
Metal Organic ◽  
Organic Framework

This Feature Article reviews a range of amorphisation mechanisms of Metal–Organic Frameworks (MOFs) and presents recent advances to produce novel MOF materials including porous MOF glasses, MOF crystal–glass composites, flux melted MOF glasses and blended zeolitic imidazolate framework glasses.

Synthesis of a Zeolitic Imidazolate–Zinc Metal–Organic Framework and the Combination of its Catalytic Properties with 2,2,2-Trifluoroethanol for N-Formylation

Synlett ◽  
2018 ◽  
Vol 29 (12) ◽  
pp. 1593-1596 ◽  
Author(s):  
Sadegh Rostamnia ◽  
Asadollah Hassankhani ◽  
Hassan Alamgholiloo ◽  
Reza Banaei
Keyword(s):  
Formic Acid ◽  
Heterogeneous Catalyst ◽  
Catalytic Properties ◽  
Metal Organic Framework ◽  
Zeolitic Imidazolate Framework ◽  
Zinc Metal ◽  
Metal Organic ◽  
Organic Framework

A novel protocol is reported for the N-formylation of amines with formic acid by using the nanoporous zeolitic imidazolate framework ZIF-8 as a heterogeneous catalyst in 2,2,2-trifluoroethanol.

Temperature-dependent assemblies from a 2-D triple-stranded meso-helical layer to a 3-D chain-layer metal–organic framework

2012 ◽  
Vol 41 (47) ◽  
pp. 14239 ◽  
Author(s):  
Hong-Guang Jin ◽  
Xu-Jia Hong ◽  
Jing Li ◽  
Yuan-Zhao Yan ◽  
Yi-Ting Liu ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Temperature Dependent ◽  
Metal Organic ◽  
Organic Framework

Two methods for constructing ZIF-8 nanomaterials with good bio compatibility and robust antibacterial applied to biomedical

2021 ◽  
pp. 088532822110336
Author(s):  
Ying Zhang ◽  
Ting-Ting Li ◽  
Bing-Chiuan Shiu ◽  
Jia-Horng Lin ◽  
Ching-Wen Lou
Keyword(s):  
Metal Organic Framework ◽  
Antibacterial Properties ◽  
Functional Materials ◽  
Hexagonal Structure ◽  
Practical Significance ◽  
Zeolitic Imidazolate Framework ◽  
Solvent Method ◽  
Framework Materials ◽  
Metal Organic ◽  
Organic Framework

Metal-organic framework materials not only possess porous structures, but also have excellent antibacterial properties. It is of great practical significance to prepare new antibacterial materials with excellent antibacterial effect by metal-organic framework materials. In our study, Zeolitic Imidazolate Framework-8 (ZIF-8) nanomaterials with antibacterial properties were prepared via the solvent method and diethanolamine template method. The materials were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), cold field-emission scanning electron microscope (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption experiment, antibacterial experiment, and biocompatibility experiment. Results showed that ZIF-8 prepared by solvent method has a more typical hexagonal structure, larger specific surface area, and smaller pore size, and the values are 1812.07 m2g−1 and 2.2412 nm, respectively. At the same time, the materials prepared by the two methods have excellent antibacterial properties, and exhibit good biocompatibility at low concentrations, the antibacterial activity against Escherichia coli and Staphylococcus aureus are higher than 95%, and the cell viabilities of the selected five material concentrations of 12.5 µg mL−1, 25 µg mL−1, 50 µg mL−1, 100 µg mL−1 and 200 µg mL−1 are more than 70%. Therefore, this study provides a feasible method for preparing Nano-scale antibacterial functional particles, and it is of great significance to broaden the application field of ZIF-8 materials and prepare ZIF-8 drug-delivery functional materials.

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