标题： 银纳米线-石墨烯杂化物等离激子-激子相互作用的超快动力学用于表面催化反应 显示英文标题

标题： Ultrafast Dynamics of Plasmon-Exciton Interaction of Ag Nanowire-Graphene Hybrids for Surface Catalytic Reactions

摘要： 使用超快泵浦-探测瞬态吸收光谱技术，在可见光-近红外区域实验研究了石墨烯-银纳米线杂化物的飞秒分辨率等离子体-激子相互作用。银纳米线的等离子体寿命约为150飞秒（fs）。对于单层石墨烯，275飞秒处的快速动态过程是由于石墨烯激子的激发，而1.4皮秒（ps）处的慢速过程是由于等离子体热电子与石墨烯声子的相互作用。对于石墨烯-银纳米线杂化物，等离子体诱导的热电子转移到石墨烯的时间尺度为534飞秒，可见光区域金属等离子体增强的石墨烯等离子体约为3.2皮秒。石墨烯-银纳米线杂化物可用于等离子体驱动的化学反应。这种由石墨烯介导的表面增强拉曼散射基底显著提高了由石墨烯-银纳米线杂化共同驱动的表面催化反应的概率和效率，与单独由单层石墨烯或单个银纳米线驱动的反应相比。这表明，由于强等离子体-激子耦合，石墨烯-银纳米线杂化物不仅能够导致高密度热电子的显著积累，还能显著提高等离子体到电子的转换效率。 显示英文摘要

摘要： Using the ultrafast pump-probe transient absorption spectroscopy, the femtosecond-resolved plasmon-exciton interaction of graphene-Ag nanowire hybrids is experimentally investigated, in the VIS-NIR region. The plasmonic lifetime of Ag nanowire is about 150 femtosecond (fs). For a single layer of graphene, the fast dynamic process at 275 fs is due to the excitation of graphene excitons, and the slow process at 1.4 picosecond (ps) is due to the plasmonic hot electron interaction with phonons of graphene. For the graphene-Ag nanowire hybrids, the time scale of the plasmon-induced hot electron transferring to graphene is 534 fs, and the metal plasmon enhanced graphene plasmon is about 3.2 ps in the VIS region. The graphene-Ag nanowire hybrids can be used for plasmon-driven chemical reactions. This graphene-mediated surface-enhanced Raman scattering substrate significantly increases the probability and efficiency of surface catalytic reactions co-driven by graphene-Ag nanowire hybridization, in comparison with reactions individually driven by monolayer graphene or single Ag nanowire. This implies that the graphene-Ag nanowire hybrids can not only lead to a significant accumulation of high-density hot electrons, but also significantly increase the plasmon-to-electron conversion efficiency, due to strong plasmon-exciton coupling.