Template free fabrication of hollow hematite spheres via a one-pot polyoxometalate-assisted hydrolysis process

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• 作者：Baodong Mao ; Zhenhui Kang ; Enbo Wang ; Chungui Tian ; Zhiming Zhang ; Chunlei Wang ; Yanli Song ; Meiye Li
• 关键词：Hematite ; Hollow spheres ; One-pot synthesis ; Nitrogen adsorption– ; desorption
• 刊名：Journal of Solid State Chemistry
• 出版年：2007
• 期刊代码：130_00224596
• 类别：ch
• 出版时间：February 2007
• 卷：180
• 期：2
• 页码：489-495
• 文件大小：681 K

摘要

Uniform hollow hematite (α-Fe₂O₃) spheres with diameter of about 600–700 nm and shell thickness lower than 100 nm are obtained by direct hydrothermal treatment of dilute FeCl₃ and tungstophosphoric acid H₃PW₁₂O₄₀ solution at 180 °C. The hollow spheres are composed of robust shells with small nanoparticles standing out of the surface and present a high-surface area and a weak ferromagnetic behavior at room temperature. The effect of concentration of H₃PW₁₂O₄₀, reaction time and temperature for the formation of the hollow spheres are investigated in series of experiments. The formation of the hollow spheres may be ascribed to a polyoxometalte-assisted forced hydrolysis and dissolution process.