In Situ Coupling of Multidimensional MOFs for Heterogeneous
Metal-Oxide Architectures: Toward Sensitive Chemiresistors
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Abstract
Metal–organic
frameworks (MOFs) are used as a new intriguing
class of templates, which enable the creation of porous inorganic
nanostructures via calcination. In this work, we first introduce in
situ coupling of multidimensional MOFs for producing heterogeneous
metal-oxide composite with multiple p–n junctions. Controlling
relative ratios of two mixed solvents (water and ethanol), in zeolitic
imidazolate framework (ZIF) growth, leads to the distinctive morphological
evolution such as rod, sheet, and polyhedron particles. One-pot hybridization
of ZIF-8 (sheet) with ZIF-67 (rods) results in the generation of hierarchically
assembled 1D ZIF-67 rods anchored on a 2D ZIF-8 sheet. Through the
calcination of such hybridized ZIFs, we successfully prepared hierarchically
assembled 1D Co<sub>3</sub>O<sub>4</sub> rods immobilized in a 2D
ZnO sheet, possessing numerous n-type ZnO/p-type Co<sub>3</sub>O<sub>4</sub> heterogeneous interfaces. This unique structure offers a
remarkably enhanced chemiresistive sensing performance (<i>R</i><sub>a</sub>/<i>R</i><sub>g</sub> = 29 at 5 ppm acetone)