磁响应性碳量子点的制备

The Preparation of Magnetic Carbon Quantum Dots

碳量子点(CQDs)因为具有良好生物相容性和独特光学特性常被用作光催化剂、荧光探针、生物传感器、药物载体等。本文研究了用4种不同碳源体系经水热法制备水溶性CQDs,通过透射电镜(TEM)、荧光光谱(PL)及X射线衍射仪(XRD)等方法表征,结果表明:以明胶-柠檬酸复合体系为碳源,当加入适量Fe(II)、Fe(III)离子(nFe(II):nFe(III) = 1:2),可合成平均粒径约3 nm、储存稳定且具有磁响应性的CQDs,其荧光量子产率可高达50.29%。

Due to carbon quantum dots (CQDs) having good biocompatibility and unique optical properties, it is often used as photocatalyst, fluorescent probes, biosensors, drug carriers, etc. In this work, we studied four types water soluble CQDs using different carbon source system by hydrothermal synthesis. Using some characterization methods, such as transmission electron microscopy (TEM), fluorescence spectroscopy (PL) and X-ray diffraction (XRD) method and so on, we prepared the best comprehensive properties of water soluble CQDs. The results showed that the CQDs had stable storage and magnetic responsivity with an average particle size of 3 nm and with the fluorescence quantum yield of the CQDs can reach 50.29%, when the gelatin citric acid composite system was used as carbon source with the ions mole ratio of Fe (II) to Fe (III) = 1:2.