The surface plasmon resonance of noble metals can be tuned by morphology and composition, offering interesting opportunities for applications in biomedicine, optoelectronics, photocatalysis, photovoltaics, and sensing. Here, we present the results of the symmetrical and asymmetrical overgrowth of metals (Ag, Pd, and Pt) onto triangular Au nanoplates using L-ascorbic acid (AA) and/or salicylic acid (SA) as reductants. By varying the reaction conditions, various types of Au nanotriangle-metal (Au NT-M) hetero-nanostructures were easily prepared. The plasmonic properties of as-synthesized nanoparticles were investigated by a combination of optical absorbance measurements and Finite-Difference Time-Domain (FDTD) simulations. We show that specific use of these reductants enables controlled growth of different metals on Au NTs, yielding different morphologies and allowing manipulation and tuning of the plasmonic properties of bimetallic Au NT-M (Ag, Pd, and Pt) structures.

中文翻译：

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金属（Ag，Pd和Pt）在Au纳米三角形上的对称和不对称外延生长：还原剂和等离子体特性的影响

贵金属的表面等离振子共振可以通过形态和组成来调节，为生物医学，光电，光催化，光伏和传感领域的应用提供了有趣的机会。在这里，我们介绍使用L将金属（Ag，Pd和Pt）对称和不对称过度生长到三角形Au纳米板上的结果-抗坏血酸（AA）和/或水杨酸（SA）作为还原剂。通过改变反应条件，可以轻松制备各种类型的Au纳米三角金属（Au NT-M）杂纳米结构。通过光学吸光度测量和有限差分时域（FDTD）模拟的组合，研究了合成纳米粒子的等离子体性能。我们表明，这些还原剂的具体使用能够在Au NTs上控制不同金属的生长，产生不同的形态，并允许对双金属Au NT-M（Ag，Pd和Pt）结构的等离子体性能进行调节和调整。