Phase‐Controlled Synthesis of Transition‐Metal Phosphide Nanowires by Ullmann‐Type Reactions
- 5 July 2010
- journal article
- research article
- Published by Wiley in Chemistry – A European Journal
- Vol. 16 (26), 7916-7924
- https://doi.org/10.1002/chem.200902151
Abstract
Transition‐metal phosphide nanowires were facilely synthesized by Ullmann‐type reactions between transition metals and triphenylphosphine in vacuum‐sealed tubes at 350–400 °C. The phase (stoichiometry) of the phosphide products is controllable by tuning the metal/PPh3 molar ratio and concentration, reaction temperature and time, and heating rate. Six classes of iron, cobalt, and nickel phosphide (Fe2P, FeP, Co2P, CoP, Ni2P, and NiP2) nanostructures were prepared to demonstrate the general applicability of this new method. The resulting phosphide nanostructures exhibit interesting phase‐ and composition‐dependent magnetic properties, and magnetic measurements suggested that the Co2P nanowires with anti‐PbCl2 structure show a ferromagnetic–paramagnetic transition at 6 K, while the MnP‐structured CoP nanowires are paramagnetic with Curie–Weiss behavior. Moreover, GC‐MS analyses of organic byproducts of the reaction revealed that thermally generated phenyl radicals promoted the formation of transition‐metal phosphides under synthetic conditions. Our work offers a general method for preparing one‐dimensional nanoscale transition‐metal phosphides that are promising for magnetic and electronic applications.Keywords
This publication has 51 references indexed in Scilit:
- Colossal Magnetoresistance in a Rare Earth Zintl Compound with a New Structure Type: EuIn2P2Chemistry of Materials, 2005
- Electrochemical Lithium Insertion in Zn3P2 Zinc PhosphideChemistry of Materials, 2005
- Electrochemical Reactivity and Design of NiP2 Negative Electrodes for Secondary Li-Ion BatteriesChemistry of Materials, 2005
- Novel catalysts for advanced hydroprocessing: transition metal phosphidesJournal of Catalysis, 2003
- The Thermodynamic Properties of Phosphorus and Solid Binary PhosphidesChemical Reviews, 2002
- A Reversible Solid-State Crystalline Transformation in a Metal Phosphide Induced by Redox ChemistryScience, 2002
- Transition-metal-based magnetic refrigerants for room-temperature applicationsNature, 2002
- Antiferromagnetic stability and structural trend of transition-metal phosphides containing CoPhysica B: Condensed Matter, 1998
- Formation of Crystalline Nanoclusters of Fe2P, RuP, Co2P, Rh2P, Ni2P, Pd5P2, or PtP2in a Silica Xerogel Matrix from Single-Source Molecular PrecursorsChemistry of Materials, 1998
- Electronic structures and magnetic properties of Fe2P, Co2P and CoMnPJournal of Physics F: Metal Physics, 1988