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Controllable Synthesis of Carbon Dots with Excitation-Wavelength-Dependent or Independent Photoluminescence for the Selective and Sensitive Detection of Co <sup>2+</sup> Ions
摘要： Fluorescent carbon dots (CDs) with excitation-wavelength-dependent and excitation-wavelength-independent emission have been prepared with varying amounts citric acid (CA), ethylenediamin end-capped polyethylenimine (PEI-EC) and sodium borohydride (NaBH4), structure, optical and chemical sensing properties have been also systematically investigated. The varying of NaBH4 and PEI-EC renders the structure and surface state change as well as photoluminescence (PL) properties. The results indicated that NaBH4 made the CDs sensitive to Co2 + ions, whilst the PEI-EC served to increase their sensitivity. The synergistic roles that both NaBH4 and PEI-EC played on the selective and sensitive detection of Co2 + were achieved via a simple adjustment of the mass ratios during synthesis. Furthermore, the PL intensity was gradually recovered until completely restored with the addition of chelating agent ethylenediaminetetraacetic acid (EDTA) to the Co2 + quenched CDs solutions. This work provided quantitatively preparation and controllable synthesis of excitation-wavelength-dependent or independent CDs for the development of PL based sensors.
关键词： Photoluminescence intensity,Selective detection,XPS analysis,Surface modification,Carbon dots
更新于2025-09-10 09:29:36
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Dinuclear Eu(III) complexes with macrocyclic tetraphosphine tetraoxide ligand and their photoluminescence properties
摘要： Dinuclear Eu(III) complexes with macrocyclic tetraphosphine tetraoxide ligand (1, 5, 9, 13-Tetraphosphacyclohexadecane-1, 5, 9, 13-tetraphenyl-1, 5, 9, 13-tetraoxide) that keep the Eu(III) ions apart were synthesized and their photoluminescence properties were investigated. It was found that quantum yield of Eu(III) complex 2 in ethyl acetate was excellent (? =0.54) even at a large concentration (1×10?3 mol/l) and strong photoluminescence was obtained. Macrocyclic TPTO ligand has a function of a “separator” of Eu(III) ions that prevents concentration quenching in the Eu(III) complexes.
关键词： Photoluminescence intensity,Quantum yields,Concentration quenching,Macrocyclic tetraphosphine tetraoxide ligand,Europium complex
更新于2025-09-04 15:30:14