Zhang Hangzhen, Bai Jiafan, Chen Xiangli, Wang Linyu, Peng Wenzhen, Zhao Yuancong, Weng Jie, Zhi Wei, Wang Jianxin
Laboratory of Advance Technologies of Materials, Ministry of Education, College of Medicine and School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
Department of Biochemistry and Molecular Biology, College of Basic and Forensic Medicine, Sichuan University, Chengdu 610041, China.
J Colloid Interface Sci. 2025 Jan 15;678(Pt A):77-87. doi: 10.1016/j.jcis.2024.08.073. Epub 2024 Aug 12.
Carbon dots have shown a broad application prospect in the fields of sensing and detection, biological imaging, and optoelectronic devices. However, it is still challenging to adopt a simple and green synthesis route and to develop new precursor systems to prepare full-color luminescent carbon dots. This study proposes a mechanism for fine regulation of carbon dot fluorescence spectra based on surface states of CN, COC, and OH, among which CN play a major role in long wavelength emission while COC and OH are responsible for the blue shift of emission wavelength. Using 4,4-bipyridine and p-phenylenediamine as precursors in safe and environmentally friendly glycol and water as solvents for the first time, the fine spectral carbon dots with full spectrum luminescence from purple (441 nm) to red (627 nm) were successfully synthesized by simply changing the composition of the reaction solvent and using a short reaction time. Compared with other reports on regulating polychromatic carbon dots, our method is more refined and has a wider distribution of luminescent colors. In addition, the obtained carbon dots based on such surface state luminescence mechanism have shown good application prospects in specific detection of Feand cell labeling.
碳点在传感检测、生物成像及光电器件等领域展现出广阔的应用前景。然而，采用简单绿色的合成路线并开发新的前驱体体系来制备全色发光碳点仍具有挑战性。本研究提出了一种基于CN、COC和OH表面态对碳点荧光光谱进行精细调控的机制，其中CN在长波长发射中起主要作用，而COC和OH则导致发射波长蓝移。首次以4,4-联吡啶和对苯二胺为前驱体，在安全环保的乙二醇和水作为溶剂中，通过简单改变反应溶剂组成并采用较短反应时间，成功合成了从紫色（441nm）到红色（627nm）全光谱发光的精细光谱碳点。与其他关于调控多色碳点的报道相比，我们的方法更加精细，发光颜色分布更广。此外，基于这种表面态发光机制所获得的碳点在Fe的特异性检测及细胞标记方面已显示出良好的应用前景。
