School of Physical and Chemical Sciences Te Kura Matū Seminar Series

Metal-organic frameworks and electrical conductivity: Three cases

Speaker

Peter Behrens

Institute

Institute for Inorganic Chemistry, Leibniz University Hannover, D-30167 Hannover, Germany

Time & Place

Wed, 28 Nov 2018 12:00:00 NZDT in Room 701, Level 7, WEST

All are welcome

Abstract

Combining the porosity (and other favorable properties) of MOFs with electrical conductivity opens up many interesting application areas, like energy storage, sensing, thermoelectrics, stimulus-responsive or neuronal implant-based drug delivery systems, and are promising for the construction of MOF-based nanodevices. This talk will present three case studies on how to impart electrical conductivity to MOFs or how to improve their properties:

i.   The Cu-2,3,6,7,10,11-hexahydroxytriphenylene-MOF (Cu3hhtp2-MOF) is known to exhibit intrinsic electrical conductivity. By optimizing the synthesis conditions, we were able to influence the morphology of MOF nanoparticles. The obtained platelets show favourable sorption properties, are easily dispersible and can be spray-coated to generate coatings which show good properties as a sensor material [1].

ii. For the formation of “true” nanocomposites of MOFs and carbon nanotubes (CNTs), we use highly functionalized CNTs which serve as nucleation points for the crystallization of MOF nanoparticles. With the MOF nanoparticles growing around the CNTs, a closely interwoven network with intimate contacts is formed, leading to high electrical conductivities even at low CNT contents and to nearly unperturbed porosity of the MOF component [2].

iii. Recently, we have described the Zr-bzpdc-MOF [3]. Due to the intrinsic reactivity of the benzophenonedicarboxylate (bzpdc) linker, the surface of the MOF can be selectively functionalized by photochemically induced radical-based reactions. We have now used this linker to initiate polymerization reactions, allowing for grafting-from polymerization of EDOT (3,4-ethylenedioxythiophene) to directly yield electrically conducting composites of MOF crystals and the electrically conductive polymer PEDOT [4].

[1] B. Hoppe, et al., P. Behrens. CrystEngComm 20 (2018) 6458-6471.

[2] H.A. Schulze, B. Hoppe, M. Schäfer, D.P. Warwas, P. Behrens. In preparation.

[3] A. Mohmeyer, et al., P. Behrens. Chem. Eur. J. 24 (2018) 12848-12855, VIP.

[4] A. Mohmeyer, et al., P. Behrens. Submitted to Chem. Commun.

 

All Welcome