八面体
材料科学
纳米颗粒
结晶学
热液循环
居里温度
纳米-
扫描电子显微镜
纳米技术
化学工程
凝聚态物理
晶体结构
化学
铁磁性
复合材料
物理
工程类
作者
Yu Liu,Haiyan Tan,Xiao‐Yu Yang,Bart Goris,Johan Verbeeck,Sara Bals,Pierre Colson,Rudi Cloots,Gustaaf Van Tendeloo,Bao‐Lian Su
出处
期刊:Small
[Wiley]
日期:2011-01-21
卷期号:7 (4): 475-483
被引量:129
标识
DOI:10.1002/smll.201001403
摘要
Very uniform and well shaped Mn₃O₄ nano-octahedra are synthesized using a simple hydrothermal method under the help of polyethylene glycol (PEG200) as a reductant and shape-directing agent. The nano-octahedra formation mechanism is monitored. The shape and crystal orientation of the nanoparticles is reconstructed by scanning electron microscopy and electron tomography, which reveals that the nano-octahedra only selectively expose {101} facets at the external surfaces. The magnetic testing demonstrates that the Mn₃O₄ nano-octahedra exhibit anomalous magnetic properties: the Mn₃O₄ nano-octahedra around 150 nm show a similar Curie temperature and blocking temperature to Mn₃O₄ nanoparticles with 10 nm size because of the vertical axis of [001] plane and the exposed {101} facets. With these Mn₃O₄ nano-octahedra as a catalyst, the photodecomposition of rhodamine B is evaluated and it is found that the photodecomposition activity of Mn₃O₄ nano-octahedra is much superior to that of commercial Mn₃O₄ powders. The anomalous magnetic properties and high superior photodecomposition activity of well shaped Mn₃O₄ nano-octahedra should be related to the special shape of the nanoparticles and the abundantly exposed {101} facets at the external surfaces. Therefore, the shape preference can largely broaden the application of the Mn₃O₄ nano-octahedra.
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