Fluorescence Spectroscopy Laboratory, Department of Chemistry, Shivaji University, Kolhapur, Maharashtra, India.
Department of Chemistry, Yashavantrao Chavan Institute of Science, Lead College of Karmaver Bhaurao Patil University, Satara, Maharashtra, India.
Luminescence. 2023 Nov;38(11):1883-1891. doi: 10.1002/bio.4578. Epub 2023 Aug 29.
Sodium dodecyl sulfate (SDS)-capped 1-pyrenecarboxaldehyde nanoparticles (PyalNPs) were prepared using a reprecipitation method in an aqueous medium and exhibited red-shifted aggregation-induced enhanced emission (AIEE). The dynamic light scattering (DLS) examination showed narrower particle size distribution with an average particle size of 41 nm, whereas -34.5 mV zeta potential value indicate the negative surface charge and good stability of nanoparticles (NPs) in an aqueous medium. The AIEE was seen at λ = 473 nm in a fluorescence spectrum of a PyalNP suspension. In the presence of Cu ions, the fluorescence of PyalNPs quenches very significantly, even in the presence of other metal ions like Ba , Ca , Cd , Co , Al , Fe , Hg , Ni and Mg . The changes in the fluorescence lifetime of PyalNPs in the presence of Cu ions suggested that the type of quenching was dynamic. The fluorescence quenching data for the NPs suspension fitted well into a typical Stern-Volmer relationship in the concentration range 1.0-25 μg/ml of Cu ions. The estimated value of the correlation coefficient R = 0.9877 was close to 1 and showed the linear relationship between quenching data and Cu ion concentration. The limit of detection (LOD) was found to be 0.94 ng/ml and is far below the tolerable intake limit value of 1.3 μg/ml accepted by the World Health Organization for Cu ions in drinking water. The fluorescence quenching approach for a SDS-capped Pyal nanosuspension for copper ion quantification is of high specificity and coexisting ions were found to interfere very negligibly. The developed method was successfully applied for the estimation of copper ions in river water samples.
十二烷基硫酸钠（SDS）封端的 1-芘甲醛纳米粒子（PyalNPs）采用在水介质中的再沉淀方法制备，并表现出红移聚集诱导增强发射（AIEE）。动态光散射（DLS）检查显示更窄的粒径分布，平均粒径为 41nm，而-34.5mV 的zeta 电位值表明纳米粒子（NPs）在水介质中的带负电荷和良好的稳定性。在 PyalNP 悬浮液的荧光光谱中，可以在 λ = 473nm 处看到 AIEE。在存在 Cu 离子的情况下，PyalNPs 的荧光非常显著地猝灭，即使存在其他金属离子如 Ba、Ca、Cd、Co、Al、Fe、Hg、Ni 和 Mg 也是如此。在存在 Cu 离子时，PyalNPs 的荧光寿命变化表明猝灭类型为动态。在 Cu 离子存在下，纳米粒子悬浮液的荧光猝灭数据非常适合在 1.0-25μg/ml 的 Cu 离子浓度范围内的典型 Stern-Volmer 关系。相关系数 R = 0.9877 的估计值接近 1，表明猝灭数据与 Cu 离子浓度之间存在线性关系。检测限（LOD）被发现为 0.94ng/ml，远低于世界卫生组织（WHO）接受的饮用水中 Cu 离子的可耐受摄入量限值 1.3μg/ml。用于定量 Cu 离子的 SDS 封端 Pyal 纳米悬浮液的荧光猝灭方法具有高特异性，并且共存离子被发现几乎没有干扰。所开发的方法成功地应用于河水样品中铜离子的估算。
