title: Luminescent metal-organic framework-functionalized graphene oxide nanocomposites and the reversible detection of high explosives.
abstract: Achieving both high specificity and sensitivity are essential for gas phase chemical detection systems. Recent implementation of Metal-Organic Frameworks (MOFs) have shown great success in separation and storage systems for specific gas molecules. By implementing a MOF structure comprised of Zn(2+) coordinated trans-stilbene derivatives, a gas responsive material has been created which exhibits a high photoluminescence quantum yield, offering new opportunities for chemical sensors. Here, we reveal a nanocomposite material, assembled from azobenzene functionalized graphene oxide and stilbene-MOF, that is capable of luminescent quenching by explosive gases. This unique system displays selectivity to dinitrotoluene (71% quenching) over trinitrotoluene (20% quenching) with sub ppm sensitivity and response times of less than a minute. We show that this implementation of a graphene-based MOF composite provides a unique strategy in the development of molecularly well-defined materials having rapid, reversible, and gas selective fluorescent quenching capabilities. This opens the way for new advances in the assembly of low density frameworks using isomerization suppressed materials.
authors.affiliation: Department of Chemistry and Research Institute of Natural Sciences Gyeongsang National University, Jinju 660-701, Korea.
authors.forename: Ji Ha
authors.initials: JH
authors.lastname: Lee
authors.forename: Justyn
authors.initials: J
authors.lastname: Jaworski
authors.forename: Jong Hwa
authors.initials: JH
authors.lastname: Jung
mesh_terms: D053834:Explosive Agents / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013267:Stilbenes / Q000737:chemistry; D014303:Trinitrotoluene / Q000032:analysis; D015032:Zinc / Q000737:chemistry
chemical_list: D053834:Explosive Agents; D010087:Oxides; D013267:Stilbenes; D014303:Trinitrotoluene; D006108:Graphite; D015032:Zinc