摘要
A frontier topic in nanotechnology is the realization of multifunctional nanoparticles （NPs） via the appropriate combination of different elements of the periodic table. The coexistence of Fe and Ag in the same nanostructure, for instance, is interesting for nanophotonics, nanomedicine, and catalysis. However, alloying of Fe and Ag is inhibited for thermodynamic reasons. Here, we describe the synthesis of Fe-doped Ag NPs via laser ablation in liquid solution, bypassing thermodynamics constraints. These NPs have an innovative structure consisting of a scaffold of face-centered cubic metal Ag alternating with disordered Ag-Fe alloy domains, all arranged in a truffle-like morphology. The Fe-Ag NPs exhibit the plasmonic properties of Ag and the magnetic response of Fe-containing phases, and the surface of the Fe-Ag NPs can be functionalized in one step with thiolated molecules. Taking advantage of the multiple properties of Fe-Ag NPs, the magnetophoretic amplification of plasmonic properties is demonstrated with proof-of-concept surface-enhanced Raman scattering and photothermal heating experiments. The synthetic approach is of general applicability and virtually permits the preparation of a large variety of multi-element NPs in one step.
在纳米技术的一个边疆话题经由周期表的不同元素的适当联合是多功能的 nanoparticles (NP ) 的实现。例如，在一样的 nanostructure 的 Fe 和 Ag 的共存为 nanophotonics， nanomedicine，和催化作用有趣。然而， Fe 和 Ag 的 alloying 为热力学的原因被禁止。这里，我们在液体答案经由激光脱离描述做 Fe 的 Ag NP 的合成，绕过热力学限制。这些 NP 有创新结构由与混乱 AgFe 合金领域轮流出现的以脸为中心的立方的金属 Ag 的脚手架组成，都安排在像块菌的形态学。FeAg NP 展出 Ag 的 plasmonic 性质和包含 Fe 阶段的磁性的反应，并且 FeAg NP 的表面能是在有 thiolated 分子的一步的 functionalized。利用 FeAg NP 的多重性质， plasmonic 性质的 magnetophoretic 扩大与 proof-of-concept 被表明散布的提高表面的拉曼和加热实验的 photothermal。合成途径具有一般适用性并且几乎在一个步骤允许多元素 NP 的一个大变化的准备。
