Oriented-assembly of hollow FePt nanochains with tunable catalytic and magnetic properties
Oriented-assembly of hollow FePt nanochains with tunable catalytic and magnetic properties
复制标题
具有可调催化和磁性的空心 FePt 纳米链的定向组装
DOI：
10.1039/c6nr00883f
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发表时间：
2016-01-01
期刊：
影响因子：
6.7
通讯作者：
Wang, Rongming
中科院分区：
文献类型：
--
作者：
Liu, Jialong;Xia, Tianyu;Wang, Rongming
具有大比表面积的中空纳米粒子在催化、储能等方面具有许多优势。此外，他们的表现可以被他们刻意的集会所操纵。在室温下，分散的空心FePt纳米球在磁场作用下组装成一维空心FePt纳米链。基于在不同反应阶段的电流置换的活化，可以有意地操纵中空FePt纳米链的尺寸从20 nm变化到300 nm，连同长度从200 nm变化到10 μ m。顺磁性Fe 3+离子的运动和由于热波动引起的形状恢复之间的竞争对中空纳米球之间的接触区域的结构起着关键作用，导致穿孔结构。与商用Pt/C相比，排列良好的空心FePt纳米链在甲醇氧化反应（莫尔）中表现出更好的催化活性.磁性测量表明，通过控制空心纳米链的尺寸和形状，可以调节包括居里温度和饱和磁化强度在内的磁性。
Hollow nanoparticles with large surface areas exhibit a lot of advantages for applications such as catalysis and energy storage. Furthermore, their performance can be manipulated by their deliberate assemblies. Dispersive hollow FePt nanospheres have been assembled into one-dimensional hollow FePt nanochains under the magnetic fields at room temperature. Based on the activation of galvanic replacement at different reaction stages, the size of hollow FePt nanochains can be deliberately manipulated varying from 20 nm to 300 nm, together with the length changing from 200 nm to 10 mu m. The competition between movement of paramagnetic Fe3+ ions and shape recovering due to thermal fluctuations plays a critical effect on the structure of contact area between hollow nanospheres, leading to perforative structures. Compared with commercial Pt/C, well aligned hollow FePt nanochains show greatly enhanced catalytic activities in the methanol oxidation reaction (MOR) due to more favorable mass flow. Magnetic measurements indicate that the magnetic properties including Curie temperature and saturation magnetization can be tuned by the control of the size and shape of hollow nanochains.