Atomic-level ablation of Au@Ag NRs using ultrafast laser excitation,Nanoscale

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Atomic-level ablation of Au@Ag NRs using ultrafast laser excitation
Nanoscale ( IF 5.8 ) Pub Date : 2021-08-27 , DOI: 10.1039/d1nr04631d
Dezhi Zhu ₁ , Jianfeng Yan ₁ , Jiawang Xie ₁ , Guangzhi He ₁

Affiliation

Metallic nanorods (NRs) are an important class of materials with widespread applications because of their appealing tunable plasmon resonances, high photothermal conversion efficiency, and chemical stability. It is essential to control the shape and atomic structures of metallic NRs for practical applications. Laser processing of metallic NRs relying on light–matter interactions provides many opportunities. However, the atomic-level fabrication of NRs remains a challenge, and the understanding of laser-induced ablation is still limited. Here, we proposed the atomic-level ablation of Au@Ag NRs using ultrafast laser excitation, which suggests that the near-field effect plays a key role in comparison with thermal evaporation. Through ultrafast laser pulse excitation, abundant atomic steps are fabricated in Au@Ag NRs, which can enhance the surface activity. We suggest that this study highlights the role of the laser near-field effect and also provides a facile strategy to tailor the external shape of metallic NRs at the atomic level, opening a pathway to design metallic NRs for energy and environmental applications.

中文翻译：

使用超快激光激发原子级烧蚀 Au@Ag NRs

金属纳米棒（NRs）是一类具有广泛应用的重要材料，因为它们具有吸引人的可调等离子体共振、高光热转换效率和化学稳定性。对于实际应用，控制金属 NRs 的形状和原子结构是必不可少的。依赖光-物质相互作用的金属 NR 的激光加工提供了许多机会。然而，NRs的原子级制造仍然是一个挑战，对激光诱导烧蚀的理解仍然有限。在这里，我们提出了使用超快激光激发对 Au@Ag NRs 进行原子级烧蚀，这表明与热蒸发相比，近场效应起着关键作用。通过超快激光脉冲激发，在 Au@Ag NRs 中制造了丰富的原子台阶，可以提高表面活性。我们建议这项研究强调了激光近场效应的作用，并提供了一种在原子水平上定制金属 NRs 外部形状的简便策略，为设计用于能源和环境应用的金属 NRs 开辟了途径。

更新日期：2021-09-22

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