In this work, we investigate surface plasmon field-enhanced fluorescence (SPF) emission from gold quantum dots (AuQDs) on a polyelectrolyte multilayer ultrathin film deposited onto an Al thin film. Polyelectrolyte layers of poly(diallyl dimethyl ammonium chloride) (PDADMAC) and poly(sodium 4-styrenesulfonate) (PSS) are deposited onto the Al surface using a layer-by-layer (LbL) adsorption technique. AuQDs are subsequently deposited onto the PDADMAC/PSS ultrathin films to study their fluorescence enhancement/quenching phenomenon, as monitored by SPF spectroscopy. The distance between the AuQDs and the Al thin film is controlled by the number of deposited PDADMAC/PSS LbL films. With increasing number of the PDADMAC/PSS bilayers, the fluorescence intensity of the AuQDs increases until the optimum distance between the AuQDs and Al layers is achieved. Moreover, silver nanoprisms (AgNPrs) are coated onto the AuQDs for H₂O₂ sensing. When the AgNPrs are present, a decrease in the fluorescence intensity of the AuQDs due to energy transfer from the AuQDs to the AgNPrs is observed. Recovery of the fluorescence intensity of the AuQDs is observed upon injection of a H₂O₂ solution, where the recovery of the intensity is proportional to the H₂O₂ concentration in the range from 1 pM to 100 nM and results from the oxidation reaction or etching of the AgNPrs. The fluorescence recovery is attributed to weakening of the quenching effect by a reduction in concentration of the AgNPrs. The proposed system exhibits strong potential for the development of H₂O₂ sensors.

在这项工作中，我们研究了沉积在Al薄膜上的聚电解质多层超薄膜上金量子点（AuQDs）的表面等离子体场增强荧光（SPF）发射。使用逐层（LbL）吸附技术将聚二烯丙基二甲基氯化铵（PDADMAC）和聚（4-苯乙烯磺酸钠）（PSS）的聚电解质层沉积到Al表面上。随后将AuQDs沉积到PDADMAC / PSS超薄膜上，以研究其荧光增强/猝灭现象，如SPF光谱法所监测。AuQD与Al薄膜之间的距离由沉积的PDADMAC / PSS LbL薄膜的数量控制。随着PDADMAC / PSS双层数量的增加，AuQD的荧光强度增加，直到实现AuQD和Al层之间的最佳距离。₂ O ₂感应。当存在AgNPrs时，观察到由于从AuQDs到AgNPrs的能量转移而导致的AuQDs的荧光强度降低。在注入H ₂ O ₂溶液后观察到AuQDs荧光强度的恢复，其中该强度的恢复与H ₂ O ₂浓度成正比，范围是1 pM至100 nM，这是氧化反应导致的或蚀刻AgNPrs。荧光恢复归因于AgNPrs浓度降低导致淬灭作用减弱。拟议的系统具有发展H ₂ O ₂传感器的强大潜力。