Ren Yingkun, Wang Yongbo, Yang Min, Liu Enzhou, Hu Xiaoyun, Zhang Xu, Fan Jun
School of Chemical Engineering, Northwest University, Xi'an 710069, People's Republic of China.
Nanotechnology. 2018 Jul 27;29(30):305707. doi: 10.1088/1361-6528/aac124. Epub 2018 Apr 30.
In this paper, L-cysteine (L-cys) and mercaptopropionic acid (MPA) co-capped ZnS quantum dots (QDs) with dual emissions have been successfully synthesized by a one-pot aqueous-phase synthesis method. The intensities of the dual emissions could be controlled by regulating the molar ratio of L-cys to MPA, and the fluorescence color also turned from blue to yellow accordingly. The relationship between the ligands and fluorescence was investigated and the results indicated that L-cys could cause two emissions and MPA improved the emission intensity. In addition, the L-cys-MPA co-capped ZnS QDs showed high photostability under UV irradiation. Therefore, the L-cys-MPA co-capped ZnS QDs, which show the dual emissions and tunable emission intensities, have great potentials for use in ratiometric fluorescence sensors and multicolor bioimaging.
在本文中，通过一锅水相合成法成功合成了具有双发射的L-半胱氨酸（L-cys）和巯基丙酸（MPA）共包覆的硫化锌量子点（QDs）。通过调节L-cys与MPA的摩尔比可以控制双发射的强度，荧光颜色也相应地从蓝色变为黄色。研究了配体与荧光之间的关系，结果表明L-cys可产生两种发射，而MPA提高了发射强度。此外，L-cys-MPA共包覆的硫化锌量子点在紫外光照射下表现出高光稳定性。因此，具有双发射和可调发射强度的L-cys-MPA共包覆的硫化锌量子点在比率荧光传感器和多色生物成像方面具有巨大的应用潜力。
