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Related Experiment Video

Updated: Mar 10, 2026

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Light-Harvesting Photothermal Hotspots Enabled by NIR Scattering-Absorption Coupling.

Zebin Wu1, Changming Bao1, Pengyu Zhang2

  • 1The Institute for Advanced Studies (IAS), Department of Ophthalmology, Zhongnan Hospital of Wuhan University, State Key Laboratory of Metabolism and Regulation in Complex Organisms, College of Life Sciences, Wuhan University, Wuhan, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 9, 2026
PubMed
Summary

We developed a scattering-absorption strategy using nanodiamonds and gold nanostars for enhanced near-infrared photothermal heating. This approach significantly boosts heating efficiency for potential cancer therapy and anti-infective treatments.

Keywords:
endocytosis‐driven hotspotsgold nanostarslow‐power photothermal ablationnanodiamondsphotothermal conversionscattering–absorption coupling

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Near-infrared (NIR) photothermal conversion is limited by photon scattering and attenuation in biological tissues.
  • Developing efficient light-harvesting nanomaterials is crucial for photothermal therapies.

Purpose of the Study:

  • To introduce a scattering-absorption coupling strategy to enhance NIR photothermal heating.
  • To investigate the synergistic effects of nanodiamonds (ND) and gold nanostars (AuNS) for supra-additive heating.
  • To demonstrate the potential of this strategy in biomedical applications, including cancer therapy and anti-infective treatments.

Main Methods:

  • Utilized nanodiamonds (ND) for broadband photon scattering and gold nanostars (AuNS) for plasmonic absorption.
  • Employed finite-difference time-domain (FDTD) calculations and Monte Carlo (MC) photon transport simulations.
  • Evaluated heating efficiency in agarose phantoms, bacterial plates, cell cultures, and in vivo mouse tumor models.

Main Results:

  • ND and AuNS exhibited supra-additive heating, significantly increasing local photon density and conversion efficiency.
  • Achieved a 4.2-fold reduction in the power density required for 50% cell kill (LD50) compared to AuNS alone.
  • Demonstrated enhanced photothermal therapeutic effects on mouse tumors in vivo.

Conclusions:

  • The scattering-absorption coupling strategy effectively overcomes photon scarcity for efficient photothermal action.
  • This biocompatible approach offers a promising platform for light-managed therapies in oncology and anti-infective treatments.
  • The design principle provides a guideline for developing advanced photothermal agents.