High sensitivity label-free detection of Fe3+ ion in aqueous solution using fluorescent MoS2 quantum dots
| Autor: | Xin Jiang, Jian Ma, Zhuozhao Luo, Yu Zheng, Haihu Yu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Aqueous solution Materials science Metals and Alloys Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Fluorescence 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Quantum dot Excited state Materials Chemistry Electrical and Electronic Engineering 0210 nano-technology Instrumentation Quantum Stoichiometry |
| Zdroj: | Sensors and Actuators B: Chemical. 281:989-997 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2018.11.039 |
| Popis: | MoS2 quantum dots were successfully prepared by a one-step hydrothermal exfoliation procedure. The prepared MoS2 quantum dots are monodispersed and have a circular shape, with an average diameter of 4.67 nm. Excited by UV-light, MoS2 quantum dots emit blue-purple fluorescence, and the fluorescence intensity is suppressed with the addition of Fe3+ ions. On this basis a novel fluorescent MoS2 quantum dots–Fe3+ label-free detection system is proposed. The decay curves of fluorescence show that the fluorescence quenching follows a static process. The binding stoichiometry ratio of Fe3+ ions toward MoS2 quantum dots is recognized as 1:1, based on the Benesi-Hildebrand and Job’s plot methods. For the concentration range of 0–50 μmol/L, the Fe3+ and fluorescence intensity are linearly related to 99.39%. The detection limit reaches 1 μmol/L. Several common ions were also examined that have little cross-influence on the fluorescence intensity of the MoS2 quantum dots. The fluorescent MoS2 quantum dots–Fe3+ probe has good performances and provides a novel, convenient and effective approach for the detection of Fe3+ of extremely low concentrations. |
| Databáze: | OpenAIRE |
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