Tan Chunlin, Zhou Chao, Peng Xingyun, Zhi Huozhen, Wang Dan, Zhan Qiuqiang, He Sailing
Centre for Optical and Electromagnetic Research, Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China.
Engineering Research Center of MTEES (Ministry of Education), School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China.
Nanoscale Res Lett. 2018 Sep 10;13(1):272. doi: 10.1186/s11671-018-2657-4.
Red-emitting carbonized polymer dots (CPDs) was prepared from p-phenylenediamine (p-PD) aqueous solution with the assistance of sulfuric acid (HSO), and the optical properties and bio-imaging application were studied in this paper. Compared with other strong acids-assisted systems, SA-CPDs (prepared from HSO-assisted system, average diameter is ~ 5 nm) is the brightest. The photoluminescence Quantum Yields (QYs) is 21.4% (in water), and the product yield is 16.5%. SA-CPDs aqueous solution emits at 600 nm when excited by the light from 300 to 580 nm. The emission wavelength is independent on the excitation wavelength. Formation energies of CPDs in two ways were calculated to show that longitudinal growth (forming polymers) is difficult, and the transverse growth (forming CPDs) is easy. In addition, the two-photon photoluminescence properties (emitting at 602 nm when excited by 850 nm femtosecond pulse laser) of SA-CPDs were also utilized in the experiments for HeLa cells staining and shown to have potential applications in bio-imaging.
通过对苯二胺（p-PD）水溶液在硫酸（H₂SO₄）辅助下制备了发红光的碳化聚合物点（CPDs），并对其光学性质和生物成像应用进行了研究。与其他强酸辅助体系相比，SA-CPDs（由H₂SO₄辅助体系制备，平均直径约为5nm）是最亮的。其光致发光量子产率（QYs）为21.4%（在水中），产物产率为16.5%。SA-CPDs水溶液在300至580nm光激发下于600nm处发射。发射波长与激发波长无关。计算了CPDs两种形成方式的形成能，结果表明纵向生长（形成聚合物）困难，横向生长（形成CPDs）容易。此外，SA-CPDs的双光子光致发光性质（在850nm飞秒脉冲激光激发下于602nm处发射）也被用于HeLa细胞染色实验，并显示出在生物成像中的潜在应用。
