Chemiresistors: Catalytic Metal Nanoparticles Embedded in Conductive Metal–Organic Frameworks for Chemiresistors: Highly Active and Conductive Porous Materials (Adv. Sci. 21/2019)

Abstract

In article number https://doi.org/10.1002/advs.201900250, Il‐Doo Kim and co‐workers develop ultra‐small and well‐dispersed metal nanoparticles (NPs) embedded in the cavities of conductive metal–organic frameworks (C‐MOFs). The unique porous structure of C‐MOFs inhibits bulk growth of metal NPs, generating highly active and porous conductive materials. The catalytic metal NPs‐loaded C‐MOFs exhibit improved NO2 sensing performance, due to the synergistic effect of catalytic metal NPs and C‐MOFs.

The function of metal–organic frameworks in the application of MOF-based composites

“…69 Apart from constructing MOF-based composite nanoparticles, the self-sacriced template method was also applied to fabricate some MOF lm-based devices in sensor or catalysis applications. [70][71][72] For example, the ZnO@ZIF-CoZn gas senor was prepared by coating a layer of ZIF-CoZn thin lm on a ZnO nanowire array via a self-sacriced template method. In addition to the dissolved Zn 2+ from the ZnO nanorod, foreign Co 2+ was also involved in the synthesis of ZnO@ZIF-CoZn, leading to the formation of the dual metal MOF thin lm on the ZnO nanowire array (Fig.…”

“…Apart from NPs, some other functional materials, including carbon materials, molecular catalysts, enzymes and so on, as well can be embedded in MOF cavities via this method. 30,46,47 Unfortunately, the activity of embedded NPs reduced to some extent due to the presence of surface capping agents or metal oxide layers. Furthermore, the complicated interfacial structures make it challenging to study the structural-functional relationship in these composite materials.…”