Ultrasmall 伪-Fe2O3 Superparamagnetic Nanoparticles with High Magnetization Prepared by Template-Assisted Combustion Process

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• 作者：Khachatur V. Manukyan ; Yong-Siou Chen ; Sergei Rouvimov ; Peng Li ; Xiang Li ; Sining Dong ; Xinyu Liu ; Jacek K. Furdyna ; Alexei Orlov ; Gary H. Bernstein ; Wolfgang Porod ; Sergey Roslyakov ; Alexander S. Mukasyan
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 24, 2014
• 年：2014
• 卷：118
• 期：29
• 页码：16264-16271
• 全文大小：513K
• ISSN：1932-7455

文摘

A template-assisted combustion-based method is developed to synthesize the ultrasmall (below 5 nm) 伪-Fe₂O₃ nanoparticles. The iron and ammonium nitrate are used as oxidizers, glycine as a 鈥渇uel鈥?and mesoporous silica (SBA-15) as a template. Because of the ultralow sizes and high crystallinity, the combustion-derived 伪-Fe₂O₃ nanoparticles exhibit superparamagnetism in the temperature range of 70鈥?00 K. The high specific surface area (132 m²/g) of 伪-Fe₂O₃ indicates the important role of surface magnetic spins resulting in remarkably high magnetization (21 emu/g) at 300 K.