Evolution of Nanostructured Manganese (Oxyhydr)oxides in Water through MnO4− Reduction

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• 作者：David Portehault ; Sophie Cassaignon ; Emmanuel Baudrin ; Jean-Pierre Jolivet
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：May 5, 2010
• 年：2010
• 卷：10
• 期：5
• 页码：2168-2173
• 全文大小：1003K
• 年卷期：v.10,no.5(May 5, 2010)
• ISSN：1528-7505

文摘

Manganese (oxyhydr)oxides are synthesized at low temperature (60 or 95 °C) from MnO₄⁻ reduction by S₂O₃²⁻ in water. Particles are characterized by X-ray diffraction, field emission scanning electron microscope, transmission electron microscopy, and electron diffraction. The reactivity of S₂O₃²⁻ as a reducing agent is tuned by the temperature in order to selectively synthesize manganite γ-MnOOH at 60 °C and hausmannite Mn₃O₄ at 95 °C. Feitknechtite β-MnOOH is identified as an intermediate phase during the formation of γ-MnOOH. Twinned triangle-shaped feitknechtite particles are obtained and proposed to grow through nanorod self-assembly. The transformation of feitknechtite nanotriangles into manganite nanowires occurs through dissolution of the feitknechtite particle core and recrystallization on the edge of the feitknechtite nanotriangles.