Supersensitive and reusable perovskite nanocomposite fiber paper for time-resolved single-droplet detection

Traditional test paper cannot be reusable and needs much sample solution. In this study, a reusable perovskite nanocomposite fiber paper consisting of CsPbBr3 quantum dots in-situ growing in the solid polymer fibers with high concentration is fabricated via microwave and electrospinning methods. RhoB is used as the sample solution because it is a hazardous matter but often occurs in printing and dyeing wastewater or appears in food as additives, and traditional detection system generally requires much sample solution (25 mu l) can this perovskite fiber paper achieve 0.01 ppm of supersensitive detection, which is superior to a majority of reported detection limit. Different from traditional detection based on luminescence intensity, this detection is a new kind of time-resolved method, so that it gets rid of complex and time-consuming calibration (1 h) usually in traditional detection, and this time-resolved detection can be achieved within-3 min. Moreover, this perovskite fiber paper is endowed with recyclable property without losing advantages of supersensitive detection (-0.01 ppm), rapid measuring speed (<3 min), and tiny dosage (<25 mu l), which is another advantage than conventional detection systems.

Automated summary

A reusable perovskite nanocomposite fiber paper has been successfully fabricated via microwave and electrospinning methods, with CsPbBr3 quantum dots growing in solid polymer fibers. Using RhoB as the sample solution, this paper achieves supersensitive detection with a detection limit of 0.01 ppm.