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Synthesis of RE(OH)_2Cl and REOCl (RE=Eu, Tb) nanostructures

Journal of Rare Earths 2008年第2期26卷 131-135页

作者： S. V. Mahajan J. Hart J. Hood A. Everheart M. L. Redigolo D. S. Koktysh E. A. Payzant J. H. Dickerson Interdisciplinary Program in Materials Science Vanderbilt UniversityNashville TN 37235 USAVanderbilt Institute of Nanoscale Science and Engineering Vanderbilt UniversityNashville TN 37235 USA Department of Physics and Astronomy Vanderbilt UniversityNashville TN 37235 USA Department of Physics and Astronomy Vanderbilt UniversityNashville TN 37235 USAVanderbilt Institute of Nanoscale Science and Engineering Vanderbilt UniversityNashville TN 37235 USA Department of Chemistry Vanderbilt UniversityNashville TN 37235 USAVanderbilt Institute of Nanoscale Science and Engineering Vanderbilt UniversityNashville TN 37235 USA Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak Ridge TN 37831 USA

Anisotropic structures, nanoneedles, and nanospindles of rare earth hydroxychloride （RE（OH）2Cl） and oxychloride （REOCl）（rare earth=Eu and Tb） were synthesized. The rare earth hydroxychloride nanostructures were formed via a thermally assisted hydrolysis of the rare-earth sesquioxide nanocrystals. The morphological evolution of the nanostructures was studied using high-resolution transmission electron microscopy and scanning electron microscopy, while the structural evolution was investigated using X-ray diffraction techniques. The thermal stability of the rare earth hydroxychlorides was investigated using thermogravimetric analysis. The rare earth oxychloride nanospindles were synthesized via a simple heat-treatment of rare earth hydroxychloride nanospindles.

关键词： rare-earth hydroxychloride rare-earth oxychloride rare earth sesquioxide nanoneedle nanospindle lanthanide

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Formation mechanism and magnetic properties of three different hematite nanostructures synthesized by one-step hydrothermal procedure

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Science China Chemistry 2011年第10期54卷 1607-1614页

作者： LIU ChunTing MA Ji LIU YuLiang College of Materials Science and Engineering Qingdao University of Science and Technology Qingdao 266061 China School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471003 China

The spindle-like, tubular, and tire-like hematite were successively fabricated by a facile, one-step hydrothermal procedure, which is of great importance in facilitating the controllable-synthesis process of commercial industrialization. A mechanism involving a formation-dissolution process was proposed based on the X-ray diffraction, scanning electron microscopy, trans-mission electron microscopy, and high-resolution transmission electron microscopy analysis. It was demonstrated that the presence of phosphate ions during the reaction process is crucial to the morphology evolution of hematite. Their different ad-sorption ability on the different crystallographic planes of hematite and a coordination effect with ferric ions could promote the preferential dissolution of the spindle-like hematite precursors along the long axis [001] from the tips down to the interior, and thus yield the tubular and tire-like hematite one by one with the increasing reaction time. The magnetic measurements have also been performed to investigate the different magnetic properties such as coercivity and low-temperature transition behavior of three different hematite nanostructures.

关键词： hematite (-Fe2O3) hydrothermal synthesis nanospindle nanotube nanotire

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Multi-shelled α-Fe_2O_3 microspheres for high-rate supercapacitors

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Science China Materials 2016年第4期59卷 247-253页

作者：聂志伟王亚平张伊放潘安强 School of Materials Science&Engineering Central South UniversityChangsha 410083China

Hollow structured metal oxides are extensively studied in energy storage and conversion systems. In this work, we report the fabrication of multi-shelled Fe_2O_3 microspheres with nanospindles assembly on its exterior shell. The β-FeOOH precursor nanospindles were firstly grown on the surface of carbon microspheres to produceβ-FeOOH@carbon composites, which were later converted into multi-shelled Fe_2O_3 microspheres by calcination in *** electrode material for supercapacitors, the multi-shelled Fe_2O_3 microspheres exhibit high capacity and good rate capability. The electrode delivers the specific capacitances of630 and 510 F g^(-1) at the current densities of 1 and 5 A g^(-1),respectively.

关键词： nanospindle multi-shells hollow microspheres Fe supercapacitors

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