【摘要】 以富含碳元素和氮元素的邻苯二胺和N,N-二甲基甲酰胺为原料，在微波辅助下通过一锅法成功制备了发射黄色荧光的碳点(o-PD-CDs),该制备方法简单快速.实验发现，所制备碳点的黄色荧光在水溶液中可被甲醛(FA)猝灭，并在FA质量浓度为0.01～0.80 mg/L时，荧光强度猝灭值与FA质量浓度呈现较好的线性关系.以o-PD-CDs为探针构建了水溶液中定量检测FA的荧光传感器，最低检出限为5.2μg/L.此外，对检测FA的传感机制进行了研究，表明o-PD-CDs含有丰富的氨基，可与FA发生席夫碱反应并生成相应的亚胺，从而导致o-PD-CDs的荧光发生猝灭.进一步实验发现，随着FA含量的增加，溶液中出现明显的席夫碱沉淀，据此可以实现质量浓度在0.5～150 mg/mL内FA的可视化半定量检测.所建立的传感器已成功应用于食品样品中甲醛的测定，回收率为98.10%～107.86%,相对标准偏差为0.86%～2.71%.更多还原

【Abstract】 In this work, the yellow fluorescent carbon dots(o-PD-CDs) was prepared by the microwave assisted method with o-phenylenediamine(o-PD) and N,N-dimethylformamide as raw materials, the preparation method is simple and rapid. Further study found that the yellow emission of o-PD-CDs would be quenched by formaldehyde(FA) in aqueous solution, and the quenching value of fluorescence intensity showed a good liner relationship with the FA concentration in the range from 0.01 to 0.80 mg/L, therefore, a fluorescent sensor was constructed for the quantitative detection of FA in aqueous solution and the limit of detection was 5.2 μg/L. Moreover, the FA sensing mechanism was explored, and the results showed that the o-PD-CDs possessed a lot of amino groups on the surface, a Schiff base reaction would occur between the amino groups and FA,which led to the fluorescence quenching of o-PD-CDs.In addition,with the increase of FA concentration,the Schiff base precipitated obviously in the solution,and the visual semi-quantitative detection of FA in the range of 0.5—150 mg/mL could be realized.The established sensor has been successfully applied to the determination of FA in food samples with the recovery rate of 98.1%—107.86% and the relative standard deviations of 0.86%—2.71%.更多还原