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Tunneling Electrical Connection to the Interior of Metal Organic Frameworks

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Title
Tunneling Electrical Connection to the Interior of Metal Organic Frameworks
Author(s)
Han, SB; Warren, SC; Seok Min Yoon; Malliakas, CD; Hou, XL; Wei, YH; Kanatzidis, MG; Bartosz A. Grzybowski
Publication Date
2015-07
Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.137, no.25, pp.8169 - 8175
Publisher
AMER CHEMICAL SOC
Abstract
Metal-organic frameworks (MOFs) are typically poor electrical conductors, which limits their uses in sensors, fuel cells, batteries, and other applications that require electrically conductive, high surface area materials. Although metal nanoclusters (NCs) are often added to MOFs, the electrical properties of these hybrid materials have not yet been explored. Here, we show that adding NCs to a MOF not only imparts moderate electrical conductivity to an otherwise insulating material but also renders it photoconductive, with conductivity increasing by up to 4 orders of magnitude upon light irradiation. Because charge transport occurs via tunneling between spatially separated NCs that occupy a small percent of the MOFs volume, the pores remain largely open and accessible. While these phenomena are more pronounced in single-MOF crystals (here, Rb-CD-MOFs), they are also observed in films of smaller MOF crystallites (MIL-53). Additionally, we show that in the photoconductive MOFs, the effective diffusion coefficients of electrons can match the typical values of small molecules diffusing through MOFs; this property can open new vistas for the development of MOF electrodes and, in a wider context, of electroactive and light-harvesting MOFs
URI
https://pr.ibs.re.kr/handle/8788114/1975
ISSN
0002-7863
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
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