Facile synthesis of N, P-doped carbon dots from maize starchviaa solvothermal approach for the highly sensitive detection of Fe3+

摘要

Nitrogen/phosphorus-doped carbon dots (N, P-CDs) with a quantum yield as high as 76.5% were synthesized by carbonizing maize starchviaa facile ethanol solvothermal approach. Transmission electron microscopy (TEM) measurement shows that the as-prepared N, P-CDs displayed a quasi-spherical shape with a mean size ofca.2.5 nm. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy disclosed the presence of -OH, -NH2, -COOH, and -CO functional groups over the surface of N, P-CDs. On the basis of excellent fluorescent properties with strong blue fluorescence emission at 445 nm upon excitation at 340 nm, these N, P-CDs were adopted as a fluorescent probe towards the effective detection of Fe(3+)ions in water. The limit of detection (LOD) was as low as 0.1 mu mol L(-1)and showed a better linear relationship in the range of 0.1 similar to 50 mu mol L-1. In conclusion, these synthesized N, P-CDs can be efficiently used as a promising candidate for the detection of Fe(3+)ions in some practical samples.