Ko Michael, Aykanat Aylin, Smith Merry K, Mirica Katherine A
Department of Chemistry-Burke Laboratory, Dartmouth College, Hanover, NH 03755, USA.
Sensors (Basel). 2017 Sep 23;17(10):2192. doi: 10.3390/s17102192.
The synthetically tunable properties and intrinsic porosity of conductive metal-organic frameworks (MOFs) make them promising materials for transducing selective interactions with gaseous analytes in an electrically addressable platform. Consequently, conductive MOFs are valuable functional materials with high potential utility in chemical detection. The implementation of these materials, however, is limited by the available methods for device incorporation due to their poor solubility and moderate electrical conductivity. This manuscript describes a straightforward method for the integration of moderately conductive MOFs into chemiresistive sensors by mechanical abrasion. To improve electrical contacts, blends of MOFs with graphite were generated using a solvent-free ball-milling procedure. While most bulk powders of pure conductive MOFs were difficult to integrate into devices directly via mechanical abrasion, the compressed solid-state MOF/graphite blends were easily abraded onto the surface of paper substrates equipped with gold electrodes to generate functional sensors. This method was used to prepare an array of chemiresistors, from four conductive MOFs, capable of detecting and differentiating NH₃, H₂S and NO at parts-per-million concentrations.
导电金属有机框架材料（MOFs）具有可合成调节的性质和固有的孔隙率，这使其成为在电寻址平台中与气态分析物进行选择性相互作用转换的有前景的材料。因此，导电MOFs是具有高潜在应用价值的功能性材料，在化学检测中具有重要作用。然而，由于其溶解性差和电导率适中，这些材料的应用受到器件集成可用方法的限制。本手稿描述了一种通过机械研磨将中等导电性MOFs集成到化学电阻传感器中的简单方法。为了改善电接触，使用无溶剂球磨法制备了MOF与石墨的混合物。虽然大多数纯导电MOF的块状粉末很难通过机械研磨直接集成到器件中，但压缩的固态MOF/石墨混合物很容易研磨到配备金电极的纸质基底表面上，以制备功能传感器。该方法用于制备由四种导电MOF组成的化学电阻器阵列，能够检测和区分百万分之一浓度的NH₃、H₂S和NO。
