Abdelbar Mostafa F, El-Sheshtawy Hamdy S, Shoueir Kamel R, El-Mehasseb Ibrahim, Ebeid El-Zeiny M, El-Kemary Maged
Institute of Nanoscience & Nanotechnology, Kafrelsheikh University 33516 Kafrelsheikh Egypt
Chemistry Department, Faculty of Science, Kafrelsheikh University Kafrelsheikh Egypt.
RSC Adv. 2018 Jul 10;8(43):24617-24626. doi: 10.1039/c8ra04186e. eCollection 2018 Jul 2.
Aggregation induced emission (AIE) has emerged as a powerful method for sensing applications. Based on AIE triggered by halogen bond (XB) formation, an ultrasensitive and selective sensor for picomolar detection of Ag nanoparticles (Ag NPs) is reported. The dye (CyI) has an iodine atom in its skeleton which functions as a halogen bond acceptor, and aggregates on the Ag NP plasmonic surfaces as a halogen bond donor or forms halogen bonds with the vacant π orbitals of silver ions (Ag). Formation of XB leads to fluorescence enhancement, which forms the basis of the Ag NPs or Ag sensor. The sensor response is linearly dependent on the Ag NP concentration over the range 1.0-8.2 pM with an LOD of 6.21 pM ( = 3), while for Ag it was linear over the 1.0-10 μM range (LOD = 2.36 μM). The sensor shows a remarkable sensitivity for Ag NPs (pM), compared to that for Ag (μM). The sensor did not show any interference from different metal ions with 10-fold higher concentrations. This result indicates that the proposed sensor is inexpensive, simple, sensitive, and selective for the detection of Ag NPs in both tap and wastewater samples.
聚集诱导发光（AIE）已成为传感应用中的一种强大方法。基于由卤键（XB）形成引发的AIE，报道了一种用于皮摩尔级检测银纳米颗粒（Ag NPs）的超灵敏且选择性的传感器。该染料（CyI）在其骨架中含有一个碘原子，其作为卤键受体发挥作用，并作为卤键供体聚集在Ag NP等离子体表面上，或与银离子（Ag）的空π轨道形成卤键。XB的形成导致荧光增强，这构成了Ag NPs或Ag传感器的基础。传感器响应在1.0 - 8.2 pM范围内与Ag NP浓度呈线性相关，检测限为6.21 pM（ = 3），而对于Ag，在1.0 - 10 μM范围内呈线性（检测限 = 2.36 μM）。与对Ag（μM）的检测相比，该传感器对Ag NPs（pM）显示出显著的灵敏度。该传感器对浓度高10倍的不同金属离子没有任何干扰。这一结果表明，所提出的传感器价格低廉、操作简单、灵敏且对自来水和废水样品中Ag NPs的检测具有选择性。
