Versatile in situ synthesis of MnO₂ nanolayers on upconversion nanoparticles and their application in activatable fluorescence and MRI imaging.

ABSTRACT: We have developed a simple and versatile strategy for in situ growth of MnO₂ on the surfaces of oleic acid-capped hydrophobic upconversion nanoparticles (UCNPs) by optimizing the component concentrations in the Lemieux-von Rudloff reagent. The oxidation time was shortened by a factor of two compared to that of the reported method. This oxidation process has no obvious adverse effects on the phases of UCNPs. STEM, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) and energy-dispersive X-ray analysis (EDX) characterization demonstrated the successful growth of MnO₂ on the surfaces of UCNPs. Furthermore, when the weight ratio of MnO₂/UCNPs reached (147.61 ± 17.63) μg mg^-1, 50% of the initial upconversion luminescence o

SUBMITTER: Wu Y 

PROVIDER: S-EPMC6009534 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature