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 Co₃O₄ rods immobilized in a 2D ZnO sheet, possessing numerous n-type ZnO/p-type Co₃O₄ heterogeneous interfaces. This unique structure offers a remarkably enhanced chemiresistive sensing performance (R_a/R_g = 29 at 5 ppm acetone).

中文翻译：

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用于异质金属氧化物体系结构的多维MOF的原位耦合：趋向于敏感的化学传感器

金属有机框架（MOF）被用作一类新颖的模板，可通过煅烧创建多孔无机纳米结构。在这项工作中，我们首先介绍用于生产具有多个p–n结的异质金属氧化物复合材料的多维MOF的原位耦合。在沸石咪唑酸酯骨架（ZIF）的生长中控制两种混合溶剂（水和乙醇）的相对比例，会导致独特的形态演变，例如棒状，片状和多面体粒子。ZIF-8（片）与ZIF-67（棒）的一锅杂交导致锚定在2D ZIF-8片上的分层组装的1D ZIF-67棒的产生。通过煅烧这种杂化的ZIF，我们成功地制备了分层组装的1D Co ₃ O ₄棒固定在2D ZnO片中，具有许多n型ZnO / p型Co ₃ O ₄异质界面。这种独特的结构提供了显着增强的化学电阻传感性能（在5 ppm丙酮下，R _a / R _g = 29）。