Abstract：
In this paper, the SQDs@MnO2 NS as the probe was applied to construct a novel \"turn-on\" fluorescent sensor for sensitive and selective detection of hydrazine (N2H4). Sulfur quantum dots (SQDs) and MnO2 nanosheets (MnO2 NS) were simply mixed, through the process of adsorption to prepare the architectures of SQDs@MnO2 NS. The fluorescent emissions of SQDs@MnO2 NS play a key role to indicate the state of the sensor. According to the inner filter effect (IFE) mechanism, the state of the sensor at the \"off\" position, or low emission, under the presence of MnO2 NS, is which the ultraviolet and visible spectrum overlaps with the fluorescence emission spectrum of SQDs. Under the optimal conditions, the emission was gradually recovered with the addition of the N2H4, since the N2H4 as a strong reductant could make the MnO2 NS converted into Mn2+, the state of the sensor at the \"on\". Meanwhile, the fluorescent sensor possesses good selectivity and high sensitivity, and the detection concentration of N2H4 with a wide range from 0.1 µM to 10 mM with a detection limit of 0.072 µM. Furthermore, actual samples were successful in detecting certain implications, indicating that the fluorescent sensor possesses the potential application ability to monitor the N2H4 in the water.
摘要：
在本文中,以SQDs@MnO2NS为探针，构建了一种新型的“开启”荧光传感器，用于对肼（N2H4）的灵敏和选择性检测。将硫量子点(SQDs)和MnO2纳米片(MnO2NS)简单混合,经由过程吸附法制备了NS一SQDs@MnO2的构造。SQDs@MnO2NS的荧光发射对指示传感器的状态起着关键作用。根据内部过滤效应(IFE)机制，传感器在“关闭”位置的状态，或低排放，在MnO2NS的存在下，即紫外和可见光谱与SQDs的荧光发射光谱重叠。在最优条件下,随着N2H4的加入，排放逐渐恢复，因为N2H4作为强还原剂可以使MnO2NS转化为Mn2+，\"on\"处的传感器状态。同时,荧光传感器具有良好的选择性和较高的灵敏度,和N2H4的检测浓度范围从0.1µM到10mM，检测限为0.072µM。此外，实际样本成功地检测了某些含义，表明荧光传感器具有监测水中N2H4的潜在应用能力。
