Email this article UNIVERSAL METHOD FOR PREPARATION OF METAL-DOPED CARBON QUANTUM DOTS
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Received: 16/03/19 Published: 08/05/19Authors
1. Mai Xuan Dung
, Hanoi Pedagogical University 22. Nguyen Thi Quynh, Hanoi Pedagogical University 2, VNU University of Science
3. Pham Thi Mai, Hanoi Pedagogical University 2
4. Nguyen Thi Tuyen, Hanoi Pedagogical University 2
5. Nguyen Thi Lan Anh, Hanoi Pedagogical University 2
6. Le Thi Phuong, Hanoi Pedagogical University 2
7. Nguyen Thi Phuong, Hanoi Pedagogical University 2
8. Nguyen Thi Kieu Trinh, Hanoi Pedagogical University 2
9. Vu Anh Duc, Hanoi Pedagogical University 2
10. Pham Truong Long, Can Tho University
Abstract
Carbon quantum dots (CQDs) have been drawn much attention for diverse application due to their low toxicity, excellent biocompatibility, visible photoluminescence and easy synthesis. Doping CQDs with metal ions has been demonstrated to add functionalities such as catalytic and magnetic properties for photocatalysis, bio-imaging and bioanalytic applications. Herein, we repot a universal method for preparation of metal doped CQDs (M-CQDs, M= Cu2+, Fe3+, Mn2+ and Pb2+). The universary is enabled by using complexes of the metal ions with ethylenediaminetetraacetic acid (EDTA) as single precursor. The mass fraction of metal varied from 3 to 13% as determined by atomic absoption spectroscopy. Optical properties of CQDs and M-CQDs were studied by UV-Vis absorption and photoluminescence spectroscopy. Metal ions such as Fe3+, Pb2+ and Cu+2 change the absorption profile in the UV region and while the emission quantum yield of QDs varied from 6 to 27%. The method is of importance for preparation of a series of M-CQDs from which the effects of metal ions on the properties of CQDs can be revealed.
Keywords
carbon quantum dots, metal doping, hydrothermal, photoluminescence, electronic interactions
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