Quantum Dot-Based Sensing of Metal Ions in Aqueous Media
Summary
Quantum dots (QDs) are semiconductor nanocrystals typically 2–10 nm in diameter, exhibiting size-tunable optical properties and intense photoluminescence. Their high surface-to-volume ratio and versatile surface chemistry render them exceptional transducers for detecting trace metal ions in water. In sensing applications, QDs are often functionalised with organic ligands or bioreceptors that modulate their emission in response to specific metal–ion interactions. Binding of target ions can induce fluorescence quenching, enhancement or spectral shifts via mechanisms such as electron or energy transfer, cation exchange or changes in surface trap states. Such optical responses enable rapid and sensitive quantification of toxic metals—including mercury, lead, cadmium and cobalt—in environmental and biological samples. Recent advances focus on eco-friendly synthesis in aqueous media, the use of non-toxic elements, integration with portable devices and exploitation of plasmonic effects to amplify sensitivity. This body of work addresses global challenges in water quality monitoring by offering cost-effective, field-deployable alternatives to conventional laboratory instrumentation.
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Quantum Dot-Based Sensing of Metal Ions in Aqueous Media publication trend
The graph below shows the total number of articles in quantum dot-based sensing of metal ions in aqueous media across all publications each year (not limited to Nature Index journals).
Technical terms
Quantum dot: A semiconductor nanocrystal whose bandgap and emission wavelength depend on particle size, enabling size-tunable fluorescence.
Photoluminescence: Emission of light from a material following absorption of photons, used to monitor QD response upon metal-ion binding.
Fluorescence quenching: Reduction in emission intensity due to processes such as electron transfer, energy transfer or complex formation with analytes.
Ligand capping: Attachment of organic or biomolecular molecules to QD surfaces, which modulates colloidal stability and selective ion binding.
Localised surface plasmon resonance (LSPR): Collective oscillation of conduction electrons in metallic nanostructures that enhances local electromagnetic fields and can amplify QD fluorescence.
References
- Advances on chalcogenide quantum dots-based sensors for environmental pollutants monitoring. The Science of The Total Environment (2024).
- Exploring the probing capacities of MSA capped CdTe semiconductor quantum dots as optical chemsensors via analytical and isotherms modeling for selective Hg2+ detection. Applied Water Science (2024).
- Fluorescent Quantum Dots and Its Composites for Highly Sensitive Detection of Heavy Metal Ions and Pesticide Residues: A Review. Chemosensors (2023).
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