Nanjing Tech University
ORCID: 0000-0002-9263-1146Publishes on Crystallization and Solubility Studies, X-ray Diffraction in Crystallography, Catalytic C–H Functionalization Methods. 56 papers and 3.6k citations.
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Particularly uniform: Monodisperse ferrite microspheres can be synthesized to have diameters of about 200–800 nm (TEM image, left). High-resolution TEM analysis (image, right and inset) shows that each microsphere is a single crystal. Their hydrophilic and magnetic properties impart to the microparticles many potential uses in electronics and biomedicine.
Ungewöhnlich einheitlich: Monodisperse Ferrit-Mikrokugeln mit Durchmessern von rund 200–800 nm (TEM-Bild, links) wurden hergestellt. Gemäß Hochauflösungs-TEM-Analyse (Bild rechts und Einschub) ist jede Mikrokugel ein Einzelkristall. Wegen ihrer hydrophilen und magnetischen Eigenschaften sollten die Mikropartikel für viele Anwendungen in der Elektronik und der Biomedizin von Interesse sein. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2005/z462551_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
We report on controlled synthesis of uniform LnVO4 (Ln = Ce and Nd) nanocrystals (NCs) with square-plate and H-shaped morphologies in nanosized reverse microemulsion reactors, via a facile solvo/hydrothermal strategy. The NCs were thoroughly characterized by X-ray diffraction, transmission electron microscopy (TEM), atomic force microscopy (AFM), energy-dispersive X-ray spectroscopy (EDS), infrared absorption spectroscopy, and photoluminescence. Possible mechanisms of the rare-earth orthovanadate NC growth and size and shape evolution are proposed. A unique upconverted avalanche luminescence property pertaining to the NCs has been discovered, systematically studied, and mechanistically discussed. Our work combines synthetic and optical studies of the NCs and lays a foundation for reinventing their applications in optoelectronics among others.
Ethylenediaminetetraacetic acid (EDTA) is shown to mediate the splitting of LnVO4 (Ln = Ce and Nd) nanocrystals from rods to sheaves and to spherulites under hydrothermal conditions with remarkable controllability and uniformity. The roles of EDTA are thought to be to (1) chelate the Ln3+ ions in solution, thus decreasing the nanocrystal nucleation rate but increasing the growth rate, and (2) interfere with the nanocrystal growth by capping the nanocrystal surfaces. Upconverted avalanche luminescence from LnVO4 nanoplates, nanowires, and straw-nanosheaves has been demonstrated and compared. We found that the LnVO4 straw-sheaves have a relatively more efficient upconversion due to the smaller avalanche excitation threshold caused by the strong cross-relaxation between the bundled nanorods in the sheaves.