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Updated: Jan 20, 2026

Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
Facile ultrasonic synthesized NH2-carbon quantum dots for ultrasensitive Co2+ ion detection and cell imaging
Yiyang Wu1, Youdi Liu1, Jingya Yin1
1School of Chemical and Biomolecular Engineering, The University of Sydney (USYD), New South Wales, 2006, Australia.
Abstract:
The amine decorated carbon quantum dots (NH2-CQDs) were synthesized through ultrasonic method from graphite rods derived CQDs and ammonia hydroxide and utilized as the sensing probes for cobalt (II) ions and nucleic acids. The sensing technique was investigated to be the fluorescence quenching effect, which demonstrated linear relationship between cobalt (II) ions concentration and the emission intensity deviation ratio in the concentration range of 50 nM to 40 μM with the detection limit of 12 nM. In brief, this sensitive and selective detection method was confirmed to demonstrate high potential in cobalt (II) ions detection in real samples and nucleic acid sensing in biological cells.
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