Hierarchical Three-Dimensional Cobalt Phosphate Microarchitectures: Large-Scale Solvothermal Synthesis, Characterization, and Magnetic and Microwave Absorption Properties

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• 作者：He Wen ; Minhua Cao ; Genban Sun ; Wenguo Xu ; Dan Wang ; Xiaoqiang Zhang ; Changwen Hu
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：October 16, 2008
• 年：2008
• 卷：112
• 期：41
• 页码：15948-15955
• 全文大小：454K
• 年卷期：v.112,no.41(October 16, 2008)
• ISSN：1932-7455

文摘

Novel hierarchical cobalt phosphate (α- and β-Co₂P₂O₇) and cobalt hydrogen phosphate hydroxide [Co₁₁(HPO₃)₈(OH)₆] three-dimensional (3D) architectures with different morphologies were synthesized under a solvothemal condition. The form and shape of cobalt phosphate can be readily tuned by adjusting experimental parameters of the reaction system. The novel hierarchical α-Co₂P₂O₇ microcrystals with basketry-like microstructures were obtained with a molar ratio of Co²⁺/H₃PO₄/CH₃NH₂/HO(CH₂)₂OH of 1:1.2:1:108, the reaction temperature of 180 °C, and the reaction time of 5 days; dumbbell-like β-Co₂P₂O₇ microspheres were formed with the same reaction temperature and time but the molar ratio of 1:1.2:1:54, and Co₁₁(HPO₃)₈(OH)₆ with peony-like nanostructures was prepared with the same molar ratio and reaction time as β-Co₂P₂O₇ but the reaction temperature of 120 °C. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectra (FT-IR) technologies, a Quantum Design superconducting quantum interference device (SQUID) magnetometer, and a network analyzer. The formation mechanism of cobalt phosphate microstructures was investigated in detail.