大尺寸硫醇配体保护金团簇的激发态动力学研究

Excited-State Dynamics of Large-Sized Thiolate-Protected Au_(n)(n>100)Nanoclusters

纳米金团簇作为桥梁连接了金纳米粒子和单个金原子,对于揭示表面等离子激元共振和金属键的来源具有重要意义。有机配体保护的纳米金团簇为理解金纳米粒子从金属性质到非金属性质的转变提供了理想的研究对象,而处于转变区域的金团簇的激发态动力学还尚待研究。在本文中,我们总结了表现出分子性质,并且尺寸较大(大于100个金原子)的纳米金团簇的激发态动力学,同时将其与表现出金属性质的金纳米粒子的激发态动力学进行比较。本文通过对处于转变区域的金团簇的电子和振动动力学的描述,进一步讨论了其电子结构。对大尺寸纳米金团簇激发态弛豫机理的深入理解,将有助于理解金属纳米团簇和纳米粒子的光学性质,从而进一步推动这一类功能材料的设计和应用。

Gold nanoclusters(size < 2.2 nm) bridge metallic gold nanoparticles and single gold atoms, playing a crucial role in revealing the origin of surface plasmon resonance and metallic bonding. Ligand-protected gold nanoclusters provide a suitable platform to understand metal to non-metal transitions while the excited-state dynamics of gold nanoclusters in the transition regime remain elusive. In this minireview, I summarize the excite-state dynamics of large-sized Au_(n)(n > 100) nanoclusters and compare them with those of plasmonic gold nanoparticles. By looking into the electron and vibration dynamics of a series of thiolate-protected gold nanoclusters in the transition regime, the electronic structures of these nanoclusters are further discussed. A deeper understanding of the mechanism of electron relaxation and energy dissipation of large-sized gold nanoclusters will be of great help to connect the optical properties of metal clusters and nanoparticles, which will further promote the design of those functional nanomaterials.