文献类型：期刊文献

英文题名：Facile Fluorescence "Turn on" Sensing of Lead Ions in Water via Carbon Nanodots Immobilized in Spherical Polyelectrolyte Brushes

作者：Tian, Yuchuan[1];Kelarakis, Antonios[2];Li, Li[1];Zhao, Fang[1];Wang, Yunwei[1];Wang, Weihua[3];Yang, Qingsong[1];Ye, Zhishuang[1];Guo, Xuhong[1,4]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai, Peoples R China;[2]Univ Cent Lancashire, Sch Phys Sci & Comp, Preston, Lancs, England;[3]Alle Chem Co, Weifang, Shandong, Peoples R China;[4]Shihezi Univ, Engn Res Ctr Mat Chem Engn Xinjiang Bingtuan, Shihezi, Peoples R China

年份：2018

卷号：6

外文期刊名：FRONTIERS IN CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000446688900001)】；

基金：We thank the financial support by the NSFC Grants (5171101370, 51773061, and 21476143), 111 Project Grant (B08021), and the financial support from China Scholarship Council for YT to work in Preston within the framework Newton Fund PhD Placement Grant (201503780053). We thank Shanghai Synchrotron Radiation Facility for its experimental support.

语种：英文

外文关键词：spherical polyelectrolyte brushes; SAXS; carbon dots; fluorescence sensor; lead ions

摘要：Heavy metal detection has become very important for the protection of water resource. In this work, a novel controllable probe is presented for the sensitive detection of Pb2+ in aqueous solutions. The probe was synthesized via the immobilization of surface functionalized carbon dots (named as CAEA-Hs) into the shell of the spherical polyelectrolyte brushes (SPB). The fluorescence of CAEA-H was firstly "turned off" via electrostatic interaction induced quenching. Based on the aggregation induced emission enhancement (AIEE), the fluorescence of the immobilized CAEA-H could be specifically turned on via the aggregation of the SPB particles. This fluorescence "turn on" sensor could selectively detect Pb2+ among five different metal ions with a relatively wide detecting range (0-1.67 mM) and good linear relationship (R-2 = 0.9958). Moreover, the aggregating behavior and nano-structure of CAEA-H loaded SPB have been systematically analyzed via small angle X-ray scattering, turbidity titration, and Zeta-potential measurement. Based on a series of control experiments, we finally gain an insight into the sensing mechanism of this novel sensing probe. This contributed a proof of concept demonstration that sensitive and selective chemical detection can be achieved via a C-dot/SPB synergistic platform.