Polyoxometalate adsorbed in a metal–organic framework for electrocatalytic dopamine oxidation

2020 ◽  
Vol 56 (79) ◽  
pp. 11763-11766
Author(s):  
Wei Huan Ho ◽  
Tsung-Yi Chen ◽  
Ken-ichi Otake ◽  
Yu-Chuan Chen ◽  
Yi-Sen Wang ◽  
...  
Keyword(s):  
Charge Transport ◽  
Electrocatalytic Activity ◽  
Metal Organic Framework ◽  
Dopamine Oxidation ◽  
Redox Active ◽  
Metal Organic ◽  
Organic Framework

A redox-active polyoxometalate, V10O28, was immobilized into a water-stable zirconium-based metal–organic framework, NU-902. The V10O28@NU-902 can show redox hopping-based charge transport and electrocatalytic activity for dopamine sensing.

Magnetic Ordering via Itinerant Ferromagnetism in a Metal-Organic Framework

2020 ◽  
Author(s):  
Jesse Park ◽  
Brianna Collins ◽  
Lucy Darago ◽  
Tomce Runcevski ◽  
Michael Aubrey ◽  
...  
Keyword(s):  
Charge Transport ◽  
Magnetic Order ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Magnetic Ordering ◽  
Double Exchange ◽  
Itinerant Ferromagnetism ◽  
Organic Solids ◽  
Metal Organic ◽  
Organic Framework

<b>Materials that combine magnetic order with other desirable physical attributes offer to revolutionize our energy landscape. Indeed, such materials could find transformative applications in spintronics, quantum sensing, low-density magnets, and gas separations. As a result, efforts to design multifunctional magnetic materials have recently moved beyond traditional solid-state materials to metal–organic solids. Among these, metal–organic frameworks in particular bear structures that offer intrinsic porosity, vast chemical and structural programmability, and tunability of electronic properties. Nevertheless, magnetic order within metal–organic frameworks has generally been limited to low temperatures, owing largely to challenges in creating strong magnetic exchange in extended metal–organic solids. Here, we employ the phenomenon of itinerant ferromagnetism to realize magnetic ordering at <i>T</i><sub>C</sub> = 225 K in a mixed-valence chromium(II/III) triazolate compound, representing the highest ferromagnetic ordering temperature yet observed in a metal–organic framework. The itinerant ferromagnetism is shown to proceed via a double-exchange mechanism, the first such observation in any metal–organic material. Critically, this mechanism results in variable-temperature conductivity with barrierless charge transport below <i>T</i><sub>C</sub> and a large negative magnetoresistance of 23% at 5 K. These observations suggest applications for double-exchange-based coordination solids in the emergent fields of magnetoelectrics and spintronics. Taken together, the insights gleaned from these results are expected to provide a blueprint for the design and synthesis of porous materials with synergistic high-temperature magnetic and charge transport properties. </b>

Metal-Organic Framework Transistors for Dopamine Sensing

2021 ◽  
Author(s):  
Jiajun Song ◽  
Jianzhong Zheng ◽  
Anneng Yang ◽  
Hong Liu ◽  
Zeyu Zhao ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Porosity ◽  
Two Dimensional ◽  
Metal Organic ◽  
Organic Framework

Two-dimensional (2D) conductive metal-organic frameworks (MOFs) can not only inherit the high porosity and tailorability of traditional MOFs but also exhibit unique charge transport properties, offering promising opportunities for applications...

scholarly journals Negative cooperativity upon hydrogen bond-stabilized O2 adsorption in a redox-active metal–organic framework

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Julia Oktawiec ◽  
Henry Z. H. Jiang ◽  
Jenny G. Vitillo ◽  
Douglas A. Reed ◽  
Lucy E. Darago ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Metal Organic Framework ◽  
Negative Cooperativity ◽  
O2 Adsorption ◽  
Redox Active ◽  
Active Metal ◽  
Metal Organic ◽  
Redox Active Metal ◽  
Organic Framework
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