Recent advances in fluorescence probes based on carbon dots for sensing and speciation of heavy metals

Nanophotonics

article

Pingjing Li¹  Sam F. Y. Li³ 

[1] Analytical Instrumentation Center, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences;Instrumentation Center in Deep-Sea Science and Engineering, Science & Technology Tower of Sanya Yazhou Bay;Department of Chemistry, 3 Science Drive 3, National University of Singapore;NUS Environmental Research Institute, National University of Singapore, T-Lab Building, 5A Engineering Drive 1

关键词: binding strategies;    bioimaging;    carbon dots;    heavy metals;    preparation of CDs;    signal response;    solid-state sensor platform;    speciation;   

DOI  :  10.1515/nanoph-2020-0507

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Heavy metal (HM) pollution is a major global concern. Carbon dots (CDs) have demonstrated unique properties as sensing platforms for HMs detection. This review summarizes the progress made in recent years in fluorescence methods to determine HMs and their species using CDs. First, the strategies to synthesize and purify CDs are reviewed. The photoluminescence principles of CDs and their sensing mechanisms as HMs sensors are then summarized. The binding strategies between CDs and HMs are proposed to provide salient principles to design desirable CD-based HMs sensors. The preparation and merits of “turn-on” and ratiometric CDs for HMs detection with higher accuracy are discussed compared with commonly used “turn-off” sensors. Subsequently, the progress on detecting single HM ions, multi-HMs, and different metal species in solution, and the development of gel/solid-state sensor platforms such as paper-based devices, sensor arrays, hydrogels, polymer films, and ion-imprinted polymers are critically accessed. Furthermore, the advances in the cell, bacterial, plant, and animal bioimaging of HMs with CDs as promising bioimaging reagents are presented. Finally, the challenges and prospects of CDs as HMs sensors in future investigations are discussed.

【 授权许可】

CC BY