Heat generation by branched Au/Pd nanocrystals: influence of morphology and composition
Heat generation by branched Au/Pd nanocrystals: influence of morphology and composition
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DOI：
10.1039/c9nr05679c
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发表时间：
2019-11-07
期刊：
影响因子：
6.7
通讯作者：
Liz-Marzan, Luis M.
中科院分区：
文献类型：
--
作者：
Quintanilla, Marta;Kuttner, Christian;Liz-Marzan, Luis M.
双金属金-钯颗粒最初被提议作为具有可调反应速率的催化剂。随着合成路线的发展可以更好地控制颗粒的形态和组成，最近提出了新颖的光学传感功能。由于温度是与其他所有提出的应用相互作用的基本参数，因此我们研究了具有规则八足形状的金/钯双金属纳米颗粒的光热转换能力。对成分（金钯比）和结构（尖端对角距离和尖端宽度）特征进行了筛选，发现它们是促进光吸收和有效转化为热量的重要控制参数。电磁模拟表明，Pd 含量，特别是其在支化颗粒几何形状内的分布，对光学性能具有深远的影响，并且是有效加热的重要标准。值得注意的是，光学和光热响应在整个延长的照射范围内保持稳定，分支纳米晶体没有由于热量产生而发生明显的结构变化。
Bimetallic gold-palladium particles were originally proposed as catalysts with tunable reaction rates. Following the development of synthesis routes that offer better control on the morphology and composition of the particles, novel optical sensing functionalities were more recently proposed. Since temperature is a fundamental parameter that interplays with every other proposed application, we studied the light-to-heat conversion ability of Au/Pd bimetallic nanoparticles with a regular octapodal shape. Both compositional (Au-to-Pd ratio) and structural (diagonal tip-to-tip distance and tip width) characteristics were screened and found to be essential control parameters to promote light absorption and efficient conversion into heat. Electromagnetic simulations reveal that the Pd content, and specifically its distribution inside the branched particle geometry, has a profound impact on the optical properties and is an essential criterion for efficient heating. Notably, the optical and photothermal responses are shown to remain stable throughout extended illumination, with no noticeable structural changes to the branched nanocrystals due to heat generation.