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Sensors 2017, 17(10), 2192;

Drawing Sensors with Ball-Milled Blends of Metal-Organic Frameworks and Graphite

Department of Chemistry—Burke Laboratory, Dartmouth College, Hanover, NH 03755, USA
Author to whom correspondence should be addressed.
Received: 30 August 2017 / Revised: 15 September 2017 / Accepted: 17 September 2017 / Published: 23 September 2017
(This article belongs to the Special Issue Chemiresistive Sensors: Status and the Future)
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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. View Full-Text
Keywords: gas sensor; chemiresistor; metal-organic framework gas sensor; chemiresistor; metal-organic framework

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ko, M.; Aykanat, A.; Smith, M.K.; Mirica, K.A. Drawing Sensors with Ball-Milled Blends of Metal-Organic Frameworks and Graphite. Sensors 2017, 17, 2192.

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