Facile Synthesis of Branched An Nanostructures by Templating Against a Self-Destructive Lattice of Magnetic Fe Nanoparticles
Facile Synthesis of Branched An Nanostructures by Templating Against a Self-Destructive Lattice of Magnetic Fe Nanoparticles
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DOI：
10.1002/anie.200804634
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发表时间：
2008-01-01
影响因子：
16.6
通讯作者：
Xia, Younan
中科院分区：
文献类型：
--
作者：
Li, Zhengquan;Li, Weiyang;Xia, Younan
本文报道了一个反应性的，自毁模板的分支Au纳米结构的简易合成的演示。该模板是一个三维多孔晶格的均匀，磁性铁纳米粒子自组装原位表面上的磁力搅拌棒。在AuCl的引入下，由于Fe和Au+之间的电置换反应，在Fe纳米颗粒之间的空隙中形成Au原子。然后Au原子在Fe纳米颗粒的限制下成核并生长成分支纳米结构。随着置换的进行，Fe被消耗以逐渐减小Fe纳米颗粒的尺寸和磁矩。在反应的某个阶段，模板开始分解以自动释放分支Au纳米结构。我们可以常规地获得Au多脚作为纯样品，通过选择性溶解剩余的Fe纳米粒子与硫酸。所制备的Au多脚体在近红外区域显示出强吸收，并且由于晶体缺陷和晶格畸变的存在，在不同的酸性溶液中表现出不同的氧化蚀刻行为。
This paper reports the demonstration of a reactive, self-destructive template for the facile synthesis of branched Au nanostructures. The template is a three-dimensionally porous lattice of uniform, magnetic Fe nanoparticles self-assembled in situ on the surface of a magnetic stir bar. Upon introduction of AuCl, Au atoms are formed in the voids among Fe nanoparticles due to the galvanic replacement reaction between Fe and Au+. The Au atoms then nucleate and grow into branched nanostructures under the confinement of Fe nanoparticles. As the replacement proceeds, Fe is consumed to gradually reduce the sizes and magnetic moments of the Fe nanoparticles. At a certain stage of the reaction, the template starts to fall apart to automatically release the branched Au nanostructures. We can routinely obtain Au multipods as pure samples via selective dissolution of the remaining Fe nanoparticles with sulfuric acid. The as-prepared Au multipods show strong absorption in the near infrared region and exhibit distinctive oxidative etching behaviors in different acidic solutions due to the presence of crystal defects and lattice distortions.