Shape‐Controlled Synthesis of Monodispersed Ultrasmall CaGd3F11 Nanocrystals for Potential Dual‐Modal Probes. Issue 11 (6th August 2014)

• Record Type: Journal Article
• Authors: Tian, Yang; Yang, Hong‐Yu; Yu, Shanshan; Li, Xia
• Is Part Of: ChemPlusChem. Volume 79:Issue 11(2014:Nov.)
• Page Start: 1584
• Page End: 1589
• Publication Date: 2014-08-06
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201402085
• Languages: English
• ISSNs: 2192-6506

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The shape‐controlled synthesis of monodispersed CaGd₃F₁₁ nanocrystals by means of a solvothermal method is reported for the first time. Their morphologies can be controlled to spherical nanoparticles and one‐dimensional (1D) nanorods by tuning the volumes of oleic acid and octylamine in the reaction solution. Powder X‐ray diffraction demonstrated their hexagonal crystalline structure. Transmission electron microscopy showed their ultrasmall sizes (sub‐10 nm) and good monodispersity. The organic capping ligands on the CaGd₃F₁₁ surfaces were analyzed through infrared spectra and X‐ray photoelectron spectroscopy. Also investigated is the influence of oleic acid and octylamine on the morphology of CaGd₃F₁₁ nanocrystals. Upconversion (UC) luminescence and magnetic resonance imaging (MRI) performance that depend on the shapes of as‐prepared CaGd₃F₁₁ were studied further. CaGd₃F₁₁ nanoparticles and nanorods exhibited UC luminescence with green monochrome after doping with Yb³⁺ and Er³⁺ ions. The CaGd₃F₁₁ nanorods emitted a much higher UC intensity than the nanoparticles. The MRI relaxivity of CaGd₃F₁₁ nanorods was enhanced relative to that of nanoparticles.</p> </abstract>