scholarly journals Optimization of Cost-Effective and Reproducible Flexible Humidity Sensors Based on Metal-Organic Frameworks

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6981
Author(s):  
Victor Toral ◽  
Florin C. Loghin ◽  
Antonio Rodríguez-Diéguez ◽  
Alejandro Lapresta-Fernández ◽  
Diego P. Morales ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Cost Effective ◽  
Film Deposition ◽  
Flexible Substrates ◽  
Humidity Sensors ◽  
Cost Effective Method ◽  
Highly Sensitive ◽  
Metal Organic

In this letter, we present the extension of a previous work on a cost-effective method for fabricating highly sensitive humidity sensors on flexible substrates with a reversible response, allowing precise monitoring of the humidity threshold. In that work we demonstrated the use of three-dimensional metal-organic framework (MOF) film deposition based on the perylene-3,4,9,10-tetracarboxylate linker, potassium as metallic center and the interspacing of silver interdigitated electrodes (IDEs) as humidity sensors. In this work, we study one of the most important issues in efficient and reproducible mass production, which is to optimize the most important processes’ parameters in their fabrication, such as controlling the thickness of the sensor’s layers. We demonstrate this method not only allows for the creation of humidity sensors, but it also is possible to change the humidity value that changes the actuator state.

Synthesis of CdSe/ZnS@HPU-2 composites for highly sensitive and multicolor florescence response to Fe3+

2019 ◽  
Vol 234 (4) ◽  
pp. 269-276
Author(s):  
Huijun Li ◽  
Yaling He ◽  
Qingqing Li ◽  
Zhouqing Xu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Composite Material ◽  
Color Change ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Dual Emission ◽  
Highly Sensitive ◽  
Metal Organic ◽  
Intensity Ratios ◽  
Uv Lamp

Abstract A composite material based dual-emission probe for Fe3+ was prepared by the hybridization of a three-dimensional framework with CdSe/ZnS quantum dots (QDs)-doped silica nanoparticles. The obtained probe showed characteristic fluorescence emissions of CdSe/ZnS QDs (red) and Cd-metal-organic framework (MOF, blue) under a single exciation wavelength. Upon the detection of Fe3+, only the fluorescence of Cd-MOF was quenched, whereas the red fluorescence of CdSe/ZnS QDs particles was mostly reserved. Consequently, the variation of the two fluorescence intensity ratios displays a continuous color change from blue to red upon exposure to different amounts of Fe3+ ions, which can be easily observed under a UV lamp.

scholarly journals Luminescent, sorptive and antibacterial potential of bismuth-organic framework

2021 ◽  
Vol 35 (1) ◽  
pp. 119-128
Author(s):  
S. Iram ◽  
T. Khurshid ◽  
S. Latif ◽  
M. Imran ◽  
F. Kanwal ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Aqueous Media ◽  
Three Dimensional ◽  
Batch Adsorption ◽  
X Ray Diffraction ◽  
Bet Analysis ◽  
Metal Organic ◽  
Ft Ir ◽  
Organic Framework

Metal organic frameworks are formed by the three-dimensional linkage of metal cores and organic linkers. In this work, bismuth-based metal organic framework (Bi-MOF) has been synthesized by using 5-hydroxyisophthalic acid (H2HIA) as linker via hydrothermal method. The said MOF was structurally characterized by UV/Vis, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), 1H NMR, energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA) and X-ray diffraction technique. This MOF showed highly porous structure with surface area 1096 m2/g as determined by BET analysis. A model batch adsorption experiment was performed to evaluate the efficiency of methylene blue (MB) dye removal from aqueous media. It was found that monolayer adsorption capacity calculated from the Langmuir isotherm was 0.6240 mg/g. Bi-MOF was also screened for its antibacterial and luminescent behavior.                     KEY WORDS: Bismuth, Metal-organic Frameworks, Luminescence, Sorption   Bull. Chem. Soc. Ethiop. 2021, 35(1), 119-128. DOI: https://dx.doi.org/10.4314/bcse.v35i1.10

scholarly journals Quantification of the mixed-valence and intervalence charge transfer properties of a cofacial metal–organic framework via single crystal electronic absorption spectroscopy

2020 ◽  
Vol 11 (20) ◽  
pp. 5213-5220
Author(s):  
Patrick W. Doheny ◽  
Jack K. Clegg ◽  
Floriana Tuna ◽  
David Collison ◽  
Cameron J. Kepert ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Mixed Valence ◽  
Three Dimensional ◽  
Fundamental Understanding ◽  
Intervalence Charge Transfer ◽  
Metal Organic ◽  
Transfer Properties ◽  
Transfer Mechanisms

Gaining a fundamental understanding of charge transfer mechanisms in three-dimensional Metal–Organic Frameworks (MOFs) is crucial to the development of electroactive and conductive porous materials.

Alkali/alkaline earth-based metal–organic frameworks on biomedical applications

2021 ◽  
Author(s):  
Jian-Qiang Liu ◽  
Gaomin Ye ◽  
Chen Chen ◽  
Jingzhe Lin ◽  
Xinsheng Peng ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Alkaline Earth ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Metal Organic ◽  
Application Prospects ◽  
Organic Framework

With steady development of metal-organic framework (MOF) materials, this peculiar class of three-dimensional materials finds application prospects in myriad of areas. The integration of different metals with varied categories of...

The crystal structure and photocatalytic properties of a three-dimensional cadmium(II) metal–organic framework: poly[bis(μ3-benzene-1,2-dicarboxylato)[μ2-1,4-bis(pyridin-3-ylmethoxy)benzene]dicadmium(II)]

2016 ◽  
Vol 72 (3) ◽  
pp. 174-178 ◽  
Author(s):  
Cai-Xia Yu ◽  
Yan-Ping Gao ◽  
Xiao-Qing Cui ◽  
Meng-Jiao Guo ◽  
Lei-Lei Liu
Keyword(s):  
Organic Contaminants ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Green Technology ◽  
Coordination Geometry ◽  
Asymmetric Unit ◽  
One Dimensional ◽  
Dimensional Network ◽  
Metal Organic

Photocatalysis is a green technology for the treatment of all kinds of contaminants and has advantages over other treatment methods. Recently, much effort has been devoted to developing new photocatalytic materials based on metal–organic frameworks for use in the degradation of many kinds of organic contaminants. With the aim of searching for more effective photocatalysts, the title three-dimensional coordination polymer, [Cd2(C8H4O4)2(C18H16N2O2)]n, was prepared. The asymmetric unit contains one CdIIcation, one benzene-1,2-dicarboxylate anion (denotedL2−) and half of a centrosymmetric 1,4-bis(pyridin-3-ylmethoxy)benzene ligand (denoted bpmb). Each CdIIcentre is five-coordinated by four carboxylate O atoms from twoL2−ligands and by one N atom from a bpmb ligand, forming a disordered pentagonal pyramidal coordination geometry. The CdIIcentres are interlinked byL2−ligands to form a one-dimensional [Cd2L2]nchain. Adjacent chains are further connected by bpmb linkers, giving rise to a two-dimensional network, and these networks are pillared by bpmb to afford a three-dimensional framework with a 33.42.63.71.81topology. Each grid in the framework has large channels which are filled mainly by the two other equivalent frameworks to form a threefold interpenetrating net. The compound exhibits relatively good photocatalytic activity towards the degradation of methylene blue in aqueous solution under UV irradiation.

scholarly journals Evaluation of two- and three-dimensional electrode platforms for the electrochemical characterization of organometallic catalysts incorporated in non-conducting metal–organic frameworks

2017 ◽  
Vol 46 (15) ◽  
pp. 4907-4911 ◽  
Author(s):  
Edgar Mijangos ◽  
Souvik Roy ◽  
Sonja Pullen ◽  
Reiner Lomoth ◽  
Sascha Ott
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Electrochemical Characterization ◽  
Organometallic Catalysts ◽  
Metal Organic ◽  
Organic Framework

The development of a reliable platform to electrochemically probe a molecular diiron complex, [FeFe], grafted in a non-conductive metal–organic framework, UiO-66, is reported.

scholarly journals Energy-based descriptors for photo-catalytically active metal–organic framework discovery

2020 ◽  
Vol 8 (8) ◽  
pp. 4473-4482 ◽  
Author(s):  
Maria Fumanal ◽  
Gloria Capano ◽  
Senja Barthel ◽  
Berend Smit ◽  
Ivano Tavernelli
Keyword(s):  
High Throughput ◽  
Light Absorption ◽  
High Throughput Screening ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Cost Effective ◽  
Active Metal ◽  
Catalytically Active ◽  
Screening Protocol ◽  
Metal Organic

A high-throughput screening protocol based on cost-effective computations of light absorption and photo-redox capabilities is proposed to discover promising photo-catalytically active metal–organic frameworks.

Efficient luminescence sensing in two lanthanide metal-organic frameworks with rich uncoordinated Lewis basic sites

CrystEngComm ◽  
2021 ◽  
Author(s):  
Liming Deng ◽  
Huihui Zhao ◽  
Kang Liu ◽  
Dingxuan Ma
Keyword(s):  
Environmental Contaminants ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Basic Sites ◽  
Highly Sensitive ◽  
Metal Organic ◽  
Lanthanide Metal

Developing highly sensitive MOF-based probes for environmental contaminants detection is of much importance and challenging. Here, two new three-dimensional lanthanide metal-organic frameworks (Ln-MOFs), {[Eu(DTA)1.5(H2O)]·H2O}n (Eu-DTA) and [Tb(DTA)(C2O4)0.5(H2O)]n (Tb-DTA) (H2DTA =...

Novel optoelectronic metal organic framework material perylene tetracarboxylate magnesium: preparation and biosensing

Nanoscale ◽  
2021 ◽  
Vol 13 (38) ◽  
pp. 16244-16250
Author(s):  
Fangjing Mo ◽  
Qian Han ◽  
Min Chen ◽  
Hui Meng ◽  
Jiang Guo ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Ultrasensitive Detection ◽  
Tetracarboxylic Acid ◽  
Metal Organic ◽  
Dna Scaffold ◽  
Organic Framework

We synthesized stable magnesium 3,4,9,10-perylene tetracarboxylic acid metal–organic frameworks applied them in a PEC regenerated-biosensor along with target-triggered three-dimensional DNA Scaffold for ultrasensitive detection of microRNA 21.

scholarly journals Copper(II)-MOF Containing Glutarate and 4,4′-Azopyridine and Its Antifungal Activity

2021 ◽  
Vol 12 (1) ◽  
pp. 260
Author(s):  
Sohyeon Yang ◽  
Mayura Veerana ◽  
Nannan Yu ◽  
Wirinthip Ketya ◽  
Gyungsoon Park ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Three Dimensional ◽  
Critical Issue ◽  
Solvothermal Reaction ◽  
Copper Metal ◽  
Colony Forming Unit ◽  
Metal Organic ◽  
3D Framework

Antifungal activities of MOFs (metal organic frameworks) have been demonstrated in studies, and improvement in efficiency of fungal inactivation is a critical issue in the application of MOFs. In this study, we employed 4,4′-azopyridine (AZPY) in the construction of MOF to improve its antifungal activity. Three-dimensional (3D) copper metal organic framework containing glutarate (Glu) and AZPY (Cu(AZPY)-MOF) was synthesized by a solvothermal reaction. Glutarates bridge Cu2 dinuclear units to form two-dimensional (2D) layers, and these layers are connected by AZPY to form a 3D framework. When spores of two fungi, Candida albicans and Aspergillus niger, were treated with Cu(AZPY)-MOF for one day, number of CFU (colony forming unit) was continuously reduced over treated MOF concentrations, and maximum 2.3 and 2.5 log10CFU reductions (approximately 99% reduction) were observed in C. albicans and A. niger, respectively. Small amounts of CuII ions and AZPY released from Cu(AZPY)-MOF were not critical for fungal inactivation. Our results indicate that the level of antifungal activity of Cu(AZPY)-MOF is greater than that of Cu-MOF without AZPY constructed in our previous study, and intercalation of AZPY is able to improve the antifungal activity of Cu(AZPY)-MOF.

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