Hogan Nicki, Sheldon Matthew
Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA.
J Chem Phys. 2020 Feb 14;152(6):061101. doi: 10.1063/1.5139665.
Metal nanostructures have been the focus of several recent studies due to their ability to generate high energy, non-equilibrium "hot" electrons for use in photochemical and photocatalytic applications. In particular, there is growing interest to understand how differences in the electronic structure and optical response of different metals may impact the behavior and utility of their hot electrons in chemical reactions. Using a continuous wave anti-Stokes Raman spectroscopy technique recently developed in our laboratory, in this study, we measured the temperature and lifetime of hot electrons in gold and copper nanostructures in order to understand how the choice of metal impacts hot electron dynamics during steady state illumination. We found that hot electrons in copper are more abundant and more reactive than those in gold, suggesting that copper nanostructures may be a more promising platform for performing hot electron photochemistry.
金属纳米结构因其能够产生高能、非平衡“热”电子用于光化学和光催化应用，成为近期多项研究的焦点。特别是，人们越来越有兴趣了解不同金属的电子结构和光学响应差异如何影响其热电子在化学反应中的行为和效用。在本研究中，我们使用我们实验室最近开发的连续波反斯托克斯拉曼光谱技术，测量了金和铜纳米结构中热电子的温度和寿命，以了解金属的选择如何影响稳态光照期间的热电子动力学。我们发现，铜中的热电子比金中的更丰富、反应性更强，这表明铜纳米结构可能是进行热电子光化学更有前景的平台。
