Journal
MICROCHEMICAL JOURNAL
Volume 164, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.microc.2021.106028
Keywords
Carbon dots; Fluorescence; Ratiometric sensor; Excitation spectra; Ferric ion
Categories
Funding
- National Natural Science Foundation of China [21875159, 21976130, 51703154]
- Tianjin Natural Science Foundation [18JCYBJC23400]
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The study synthesized HPEI-CDs with concentration-modulated dual-excitation fluorescence property and successfully detected Fe3+ using them as a ratiometric sensor, demonstrating a wide linear response concentration range and low detection limit. The sensor showed good selectivity and anti-interference capacity due to the high concentration of HPEI-CDs.
The development of ratiometric fluorescence sensing platforms with simple synthetic routes and good antiinterference capacities are of great importance for their further application. Herein, hyperbranched polyethylenimine passivated carbon dots (HPEI-CDs) with concentration-modulated dual-excitation fluorescence property were synthesized. At a low concentration, HPEI-CDs only showed one fluorescence center, while at a relatively high concentration, its excitation peak around 355 nm would split into two peaks. Energy level splitting and broadening were demonstrated to be the origin of such dual-excitation behavior. Based on the dualexcitation signals, HPEI-CDs could serve as a ratiometric sensor for the detection of Fe3+ in aqueous solution. The assay exhibited a wide linear response concentration range (2?360 ?M) with a limit of detection of 0.47 ?M. Significantly, benefiting from the high concentration of HPEI-CDs, the sensor showed good selectivity and excellent anti-interference capacity. In addition, this nanosensor was successfully applied for the detection of Fe3+ in real water samples with satisfactory recoveries.
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