Carbon Dots Enabling Parts‐Per‐Billion Sensitive and Ultraselective Photoluminescence Lifetime‐Based Sensing of Inorganic Mercury
Source abstract
Abstract
Abstract One of the UN Sustainable Development Goals is to ensure universal access to clean drinking water. Among the various types of water contaminants, mercury (Hg) is considered to be one of the most dangerous ones. It is mostly its immense toxicity and vast environmental impact that stand out. To tackle the issue of monitoring water quality, a nanosensor based on carbon dots (CDs) is developed, whose surface is functionalized with carboxylic groups. CDs show Hg2+ concentration‐dependent photoluminescence (PL) lifetimes along with an ultrahigh sensitivity and selectivity. The selectivity of PL quenching by Hg2+ is rationalized by performing light‐induced electron paramagnetic resonance (LEPR) spectroscopy showing significant perturbation of the CD photoexcited state upon Hg2+ binding. The experimental findings are supported by time‐dependent density functional theory (TD‐DFT) calculations. These unveiled the emergence of a low‐lying charge transfer state involving a vacant 6s orbital of Hg2+ stabilized by relativistic effects.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Carbon and Quantum Dots Applications · Mercury impact and mitigation studies · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Regional Centre of Advanced Technologies and Materials Czech Advanced Technology and Research Institute (CATRIN) Palacký University Olomouc Šlechtitelů 241/27 Olomouc 783 71 Czech Republic
Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM) Physical Chemistry I Friedrich‐Alexander‐Universität Erlangen‐Nürnberg Egerlandstraße 3 91058 Erlangen Germany
Chemical and Biological Systems Simulation Lab Centre of New Technologies University of Warsaw 2c Banacha Street Warsaw 02–097 Poland
Department of Chemistry Faculty of Natural Sciences Matej Bel University Tajovského 40 Banská Bystrica 974 01 Slovak Republic
Nanotechnology Centre Centre for Energy and Environmental Technologies VŠB – Technical University of Ostrava 17. listopadu 2172/15 Ostrava‐Poruba 708 00 Czech Republic
IT4Innovations VŠB—Technical University of Ostrava 17. listopadu 2172/15 Ostrava‐Poruba 708 00 Czech Republic
Funding
Grantová Agentura České Republiky · Agentúra na Podporu Výskumu a Vývoja · European Regional Development Fund · European Cooperation in Science and Technology
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