Multifunctional nanoprobes for both fluorescence and 19 F magnetic resonance imaging.

Fluorescence is widely used for cell imaging due to its high sensitivity and rich color choice but limited for in vivo imaging because of its low light penetration. Meanwhile, magnetic resonance imaging (MRI) is widely applied for in vivo diagnosis but not suitable for cell imaging because of its low resolution. Compared to 1 H-MRI, 19 F-MRI is more suitable for clinical application due to its high sensitivity but fabricating 19 F-MRI probes is a great challenge. Therefore, it is highly desirable to develop a dual-modal imaging probe for both cell fluorescence imaging and in vivo19 F-MRI with high sensitivity and deep penetration. In this study, 19 F moiety loaded nanocomposites with an organic fluorescent core were successfully prepared via a facile strategy by encapsulating organic dyes with oleylamine-functionalized polysuccinimide and 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PDTES). The aggregation of organic fluorescent dyes in the core results in significant fluorescence for optical imaging, while the 19 F moieties on PDTES allow for simultaneous 19 F MRI. Moreover, the nanocomposites exhibited high water dispersibility and excellent biocompatibility. These properties make them promising for both cell imaging and in vivo imaging applications.