超声电化学快速制备近红外CdTe量子点与细胞成像

针对当前水溶性量子点合成路线复杂、量子产率低的现状, 在无需N₂保护的条件下, 采用简便的超声电化学方法快速合成了CdTe量子点前驱体;并对不同条件下制得的前驱体加热回流, 得到水溶性、高质量的近红外CdTe量子点。产物的形貌、结构和组成通过高分辨透射电子显微镜(HRTEM)、X-射线粉末衍射(XRD)等手段进行了表征。考察了超声电化学参数和回流条件对量子点荧光性质的影响。通过控制电流脉冲宽度、反应时间、反应温度等参数, 实现了CdTe量子点前驱体的可控制备;通过调节加热回流条件得到不同荧光发射波长的量子点;选用602 nm近红外发射波长的CdTe量子点标记了子宫颈癌细胞(Hela), 并采用共聚焦技术实现了肿瘤细胞的显微成像观察。和传统的量子点合成方法相比, 超声电化学方法具有合成路线简单、参数易调可控的特点;为高品质量子点的快速制备提供了新的思路, 拓展了超声电化学在纳米材料制备领域的应用。

Facile Synthesis of Near-Infrared CdTe Quantum Dots via Sonoelectrochemistry and Its Application for Cell Imaging

Aiming at the simplification of synthesis routes and the improvement of photoluminescence quantum yields (PL QYs), a facile and fast method has been developed to synthesize CdTe quantum dots (QDs) precursor in aqueous phase by sonoelectrochemistry without the protection of N₂. The high qualities, water-soluble, near-infrared-emitting CdTe QDs were obtained by refluxing of the precursors in oil bath. The morphology, structure and composition of the products were investigated by HRTEM and XRD. The influences of sonoelectrochemical and refluxing parameters on the PL properties of products were studied. By adjusting the current pulse width, reaction time and reaction temperature, the size- and morphology-controlled CdTe QDs precursors were obtained. CdTe QDs with different emission wavelengths were obtained by followed refluxing. The as-prepared QDs with near-infrared emission of 602 nm were used in the labeling of Hela cell and imaging by confocal laser scanning microscopy (CLSM). Compared with traditional synthesis, sonoelectrochemical route is facile and controllable in the synthesis for water-soluble high-quality QDs, which extends its application in the preparation of nanomaterials.