Defect Damping-Enhanced Plasmonic Photothermal Conversion

作者：Shuyi Zhu, Shuai Xu, Yujing Guo, Hongwen Zhang, Kun Ma, Junfeng Wang, Qian Zhao, Le Zhou, Weiping Cai · 发表于：ACS Nano · 年份：2023 · DOI：10.1021/acsnano.3c00657 · 被引用次数：39 · 研究领域：Gold and Silver Nanoparticles Synthesis and Applications、Plasmonic and Surface Plasmon Research、Nanoplatforms for cancer theranostics

Significantly increasing the photothermal conversion of plasmonic nanostructured particles (PNPs) is a common goal for all applications of thermoplasmonics, but it is still in challenge, especially for PNPs with the morphology and composition required for a specific photothermal application. Here, we present a concept of defect-induced damping-enhanced photothermal conversion, which favors PNP intrinsic properties. A model of a defect-damped harmonic oscillator is established to depict photothermal conversion correlation with the structure of PNPs and is capable of accurately reproducing the optical performance of the PNPs with the local surface plasmon resonance far from the interband transition. The theoretical model analyses demonstrate that the defect-induced damping can significantly suppress the light scattering of the PNPs and effectively improve their photothermal conversion efficiency. Especially for the PNPs with a sufficiently large size (larger than ∼100 nm for Au and Ag), we show that defect-induced damping can significantly enhance their light absorption and photothermal performances. These are experimentally confirmed. Typically, defect-enriched Au nanostars with ∼100–150 nm profile size were fabricated and showed much higher photothermal performance and a big increment by 23% in photothermal conversion efficiency, compared with the normal (or defect-impoverished) counterpart. Furthermore, the in vitro and in vivo biological experiments demonstrate that this de...