Defect Damping-Enhanced Plasmonic Photothermal Conversion
作者：Zhu Shuyi；Xu Shuai；Guo Yujing；Zhang Hongwen；Ma Kun；Wang Junfeng；Zhao Qian；Zhou Le；Cai Weiping
期刊：ACS NANO
卷（期）页：Volume：17；Issue：11； Page：10300-10312
全文链接：
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期刊：ACS NANO
卷（期）页：Volume：17；Issue：11； Page：10300-10312
全文链接：
Significantly increasing the photothermalconversion of plasmonicnanostructured particles (PNPs) is a common goal for all applicationsof thermoplasmonics, but it is still in challenge, especially forPNPs with the morphology and composition required for a specific photothermalapplication. Here, we present a concept of defect-induced damping-enhancedphotothermal conversion, which favors PNP intrinsic properties. Amodel of a defect-damped harmonic oscillator is established to depictphotothermal conversion correlation with the structure of PNPs andis capable of accurately reproducing the optical performance of thePNPs with the local surface plasmon resonance far from the interbandtransition. The theoretical model analyses demonstrate that the defect-induceddamping can significantly suppress the light scattering of the PNPsand effectively improve their photothermal conversion efficiency.Especially for the PNPs with a sufficiently large size (larger than similar to 100 nm for Au and Ag), we show that defect-induced dampingcan significantly enhance their light absorption and photothermalperformances. These are experimentally confirmed. Typically, defect-enrichedAu nanostars with similar to 100-150 nm profile size were fabricatedand showed much higher photothermal performance and a big incrementby 23% in photothermal conversion efficiency, compared with the normal(or defect-impoverished) counterpart. Furthermore, the invitro and in vivo biological experimentsdemonstrate that this defect-enriched PNP can indeed exhibit significantlyhigher photothermal performance than the normal counterpart in cellsand mouse tumors, which confirms the validity of the presented strategyin typical practical applications. This work provides a strategy tointrinsically and significantly enhance plasmonic photothermal conversionof PNPs with a sufficiently large size, which is not only suitablefor PNPs with the morphology and composition required for specificapplications but also can be combined with existing strategies tofurther increase their photothermal performance.