聚甲基丙烯酸甲酯包覆(CH3NH3)PbBr3纳米晶静电纺丝膜的制备及对氨气的荧光传感

采用原位合成法制备了聚甲基丙烯酸甲酯包覆MAPbBr₃纳米晶(MAPbBr₃@PMMA，MA=甲铵离子)静电纺丝膜。当氨气(NH₃)通入MAPbBr₃@PMMA纤维膜时与MAPbBr₃中的MA发生取代，能显著降低MAPbBr₃@PMMA纤维的荧光强度，以此构建了基于MAPbBr₃@PMMA纤维荧光猝灭的NH₃传感器。通过扫描电镜、透射电镜、粉末X射线衍射和红外对静电纺丝膜的形貌和结构进行表征，通过紫外可见光谱、荧光光谱对其光学特性进行表征。结果表明，传感器的荧光强度与NH₃浓度在8~90 mg·L^-1之间呈现出良好的线性关系(r=0.995 9)，NH₃的检出限低(3 mg·L^-1)，且具有良好的重现性和选择性。在实际样品气体的测定中，加标回收率为92.2%~102.1%，相对标准偏差(RSD)为1.8%~3.2%。

Preparation of polymethyl methacrylate-coated (CH3NH3)PbBr3 nanocrystalline electrospinning film and fluorescence sensing of ammonia

In this work, a novel polymethyl methacrylate-coated MAPbBr₃ nanocrystalline (MAPbBr₃@PMMA, MA= methylammonium) electrospinning film was synthesized by in situ growth method, and NH₃ sensor was constructed based on the fluorescence significant quenching of the MAPbBr₃@PMMA electrospinning film after the addition of NH₃ gas. The morphology and structure of MAPbBr₃@PMMA fiber were characterized by scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, and infrared spectroscopy, and its optical properties were characterized by UV-Vis and fluorescence spectroscopy. The results showed that the prepared NH₃ sensor showed a good linear relationship (r=0.995 9) to NH₃ gas concentration in a range of 8-90 mg·L^-1, low detection limit (3 mg·L^-1), and high reproducibility and selectivity. Finally, the standard recovery and the relative standard deviation (RSD) for NH₃ of actual sample gas were 92.2%-102.1% and 1.8%-3.2%, respectively.