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Abstract：
A bimetallic core-shell nanostructure is a versatile platform for achieving intriguing optical and catalytic properties. For a long time, this core-shell nanostructure has been limited to ones with noble metal cores. Otherwise, a galvanic replacement reaction easily occurs, leading to hollow nanostructures or completely disintegrated ones. In the past few years, great efforts have been devoted to preventing the galvanic replacement reaction, thus creating an unconventional class of core-shell nanostructures, each containing a less-stable-metal core and a noble metal shell. These new nanostructures have been demonstrated to show unique optical and catalytic properties. In this work, we first briefly summarize the strategies for synthesizing this type of unconventional core-shell nanostructures, such as the delicately designed thermodynamic control and kinetic control methods. Then, we discuss the effects of the core-shell nanostructure on the stabilization of the core nanocrystals and the emerging optical and catalytic properties. The use of the nanostructure for creating hollow/porous nanostructures is also discussed. At the end of this review, we discuss the remaining challenges associated with this unique core-shell nanostructure and provide our perspectives on the future development of the field.
摘要：
双金属核-壳纳米结构是实现有趣的光学和催化性能的通用平台。很长一段时间,这种核-壳纳米结构仅限于具有贵金属核的纳米结构。否则,很容易发生电置换反应，导致中空纳米结构或完全分解的纳米结构。在过去的几年里,大力防止电置换反应，从而创造了一类非常规的核壳纳米结构，每个包含不太稳定的金属核和贵金属壳。这些新的纳米结构已被证明显示出独特的光学和催化性质。在这项工作中,我们首先简要总结了合成这种非常规核壳纳米结构的策略，如精心设计的热力学控制和动力学控制方法。然后，我们讨论了核壳纳米结构对核纳米晶体的稳定性以及新兴的光学和催化性能的影响。还讨论了使用纳米结构来产生中空/多孔纳米结构。在这次审查结束时，我们讨论了与这种独特的核壳纳米结构相关的剩余挑战，并提供了我们对该领域未来发展的看法。
