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Defect Damping-Enhanced Plasmonic Photothermal Conversion.

Shuyi Zhu1,2, Shuai Xu3, Yujing Guo1

  • 1Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China.

ACS Nano
|May 26, 2023
PubMed
Summary
This summary is machine-generated.

Introducing defect-induced damping to enhance photothermal conversion in plasmonic nanostructured particles (PNPs). This strategy significantly boosts efficiency, especially for larger particles, with validated in vitro and in vivo applications.

Keywords:
defect-enriched plasmonic nanoparticlesdefect-induced dampingenhanced plasmonic photothermal conversionin vitro and in vivo photothermal experiments

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Enhancing photothermal conversion efficiency in plasmonic nanostructured particles (PNPs) is crucial for thermoplasmonics applications.
  • Achieving high efficiency is challenging for PNPs with specific morphology and composition requirements.

Purpose of the Study:

  • To present a novel strategy for intrinsically enhancing photothermal conversion in PNPs.
  • To investigate the effect of defect-induced damping on PNP photothermal performance.

Main Methods:

  • Developed a theoretical model of a defect-damped harmonic oscillator to correlate PNP structure with photothermal conversion.
  • Fabricated defect-enriched gold nanostars (Au NSs) with sizes around 100-150 nm.
  • Conducted in vitro and in vivo experiments to validate enhanced photothermal performance.

Main Results:

  • Theoretical analysis showed defect-induced damping suppresses light scattering and improves photothermal conversion efficiency, particularly for larger PNPs (>100 nm).
  • Experimentally, defect-enriched Au NSs exhibited significantly higher photothermal performance, with a 23% increase in conversion efficiency compared to defect-poor counterparts.
  • In vitro and in vivo studies confirmed superior photothermal efficacy of defect-enriched PNPs in cells and mouse tumors.

Conclusions:

  • Defect-induced damping offers an intrinsic strategy to significantly enhance the photothermal conversion of sufficiently large PNPs.
  • This approach is adaptable for PNPs with specific application-driven morphologies and compositions.
  • The strategy can be combined with existing methods to further boost photothermal performance.