title: Microwave-assisted synthesis of highly fluorescent nanoparticles of a melamine-based porous covalent organic framework for trace-level detection of nitroaromatic explosives.
abstract: Covalent organic frameworks (COFs) are a new generation of porous materials constructed from light elements linked by strong covalent bonds. Herein we present rapid preparation of highly fluorescent nanoparticles of a new type of COF, i.e. melamine-based porous polymeric network SNW-1, by a microwave-assisted synthesis route. Although the synthesis of SNW-1 has to be carried out at 180°C for 3d under conventional reflux conditions, SNW-1 nanoparticles could be obtained in 6h by using such a microwave-assisted method. The results obtained have clearly demonstrated that microwave-assisted synthesis is a simple yet highly efficient approach to nanoscale COFs or other porous polymeric materials. Remarkably, the as-synthesized SNW-1 nanoparticles exhibit extremely high sensitivity and selectivity, as well as fast response to nitroaromatic explosives such as 2,4,6-trinitrotoluene (TNT), 2,4,6-trinitrophenylmethylnitramine (Tetryl) and picric acid (PA) without interference by common organic solvents, which is due to the nanoscaled size and unique hierarchical porosity of such fluorescence-based sensing material.
authors.affiliation: Laboratory of Advanced Porous Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Zhang
authors.forename: Ling-Guang
authors.initials: LG
authors.lastname: Qiu
authors.forename: Yu-Peng
authors.initials: YP
authors.lastname: Yuan
authors.forename: An-Jian
authors.initials: AJ
authors.lastname: Xie
authors.forename: Yu-Hua
authors.initials: YH
authors.lastname: Shen
authors.forename: Jun-Fa
authors.initials: JF
authors.lastname: Zhu
mesh_terms: D053834:Explosive Agents / Q000032:analysis*; D005453:Fluorescence; D057230:Limit of Detection; D046529:Microscopy, Electron, Transmission; D008872:Microwaves; D053758:Nanoparticles; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D014227:Triazines / Q000737:chemistry*
chemical_list: D053834:Explosive Agents; D014227:Triazines; C011907:melamine