A simple approach for the synthesis of luminescent carbon dots (C-dots) has been developed by the hydrothermal treatment of lemon juice as carbon precursor at 240 °C in 12 h. The obtained C-dots were found to emit bright green luminescence. Meanwhile, the C-dots exhibited excitation-dependence, photo-stability, and well dispersibility. The C-dots were used for detection of ion V⁵⁺ in water and serum, which was based on V⁵⁺ induced luminescence quenching of C-dots. The selectivity experiments revealed that the luminescent sensor was specific for V⁵⁺ ions even with interference by high concentrations of other metal ions. Detection limits for V⁵⁺ ions was 3.2 ppm. These results suggest that the present C-dots are potential application in optoelectronic, imaging and luminescent probing of V⁵⁺ ions.

通过将柠檬汁作为碳前驱体在240°C下进行12小时的水热处理，已经开发出一种合成发光碳点（C-点）的简单方法。发现所获得的C点发射出明亮的绿色发光。同时，C点表现出激发依赖性，光稳定性和良好的分散性。C点用于检测水和血清中的离子V ⁵⁺，其基于V ⁵⁺诱导的C点发光猝灭。选择性实验表明，发光传感器对V ⁵⁺离子具有特异性，即使受到高浓度其他金属离子的干扰也是如此。V ^5+的检出限离子为3.2ppm。这些结果表明，当前的C点在V ⁵⁺离子的光电，成像和发光探测中具有潜在的应用。