Shape-Controlled Synthesis of Magnetic Iron Oxide@SiO2-Au@C Particles with Core-Shell Nanostructures
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Li, Mo
- 通讯作者：
- Li, XC (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, R&D Ctr Membrane Sci & Technol, Sch Chem Engn, Dalian 116024, Peoples R China.
- 合写作者：
- Li, Xiangcun,Qi, Xinhong,Luo, Fan,He, Gaohong
- 发表时间：
- 2015-05-12
- 发表刊物：
- LANGMUIR
- 收录刊物：
- SCIE、EI、Scopus
- 文献类型：
- J
- 卷号：
- 31
- 期号：
- 18
- 页面范围：
- 5190-5197
- ISSN号：
- 0743-7463
- 摘要：
- The preparation of nonspherical magnetic core-shell nanostructures with uniform sizes still remains a challenge. In this study, magnetic iron oxide@SiO2-Au@C particles with different shapes, such as pseduocube, ellipsoid, and peanut, were synthesized using hematite as templates and precursors of magnetic iron oxide. The as-obtained magnetic particles demonstrated uniform sizes, shapes, and well-designed core-shell nanostructures. Transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) analysis showed that the Au nanoparticles (AuNPs) of similar to 6 nm were uniformly distributed between the silica and carbon layers. The embedding of the metal nanocrystals into the two different layers prevented the aggregation and reduced the loss of the metal nanocrystals during recycling. Catalytic performance of the peanut-like particles kept almost unchanged without a noticeable decrease in the reduction of 4-nitrophenol (4-NP) in 8 min even after 7 cycles, indicating excellent reusability of the particles. Moreover, the catalyst could be readily recycled magnetically after each reduction by an external magnetic field.
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- 否
