CsPbBr3and CsPbBr3/SiO2Nanocrystals as a Fluorescence SensingPlatform for High-Throughput Identification of Multiple ThiopheneSulfides

Air pollution is a serious problem. Refractorythiophene sulfides, which cause air pollution, bring great challengesto their rapid and accurate identification. In this work, we proposeafluorescent sensor array based on two perovskite nanocrystals(CsPbBr3NCs and CsPbBr3/SiO2NCs) to distinguish differentthiophene sulfides. The hydrogen bonding force between thethiophenics of thiophene sulfides and the amino groups of theperovskite NCs results in the weakening of thefluorescence signalsof the perovskite NCs. The diverse interactions between thiophenesulfides and two perovskite NCs provide rich information, whichcan be obtained on the sensor array and identified by linear discriminant analysis. Five thiophene sulfides (i.e., benzothiophene,dibenzothiophene, 2-methylbenzothiophene, 3-methylthiophene, and thiophene) were discriminated by the sensor array atconcentrations of 10-50 ppm. The effectiveness of the sensor array was further verified in the discrimination of blinded samples, inwhich all 10 samples were correctly identified. In addition, it is gratifying that even binary mixtures of thiophene sulfides could bedistinguished by the proposed sensor array.