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Related Experiment Video

Updated: Apr 17, 2026

Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers
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Core-shell upconversion nanoparticle - semiconductor heterostructures for photodynamic therapy.

Qing Qing Dou1, Adith Rengaramchandran2, Subramanian Tamil Selvan3

  • 1Institute of Materials Research and Engineering (IMRE), A * STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602.

Scientific Reports
|February 6, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces novel core-shell nanoparticles (CSNPs) combining NaYF4:Yb,Tm upconversion nanoparticles and ZnO for photodynamic therapy. These engineered nanoparticles effectively generate reactive oxygen species (ROS) to induce cancer cell death.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Core-shell nanoparticles (CSNPs) are gaining interest, but lattice mismatch hinders diverse crystal structures.
  • Developing CSNPs with controlled heterostructures is crucial for advanced applications.

Purpose of the Study:

  • To design and characterize novel core-shell heterostructures for photodynamic therapy (PDT).
  • To investigate the potential of NaYF4:Yb,Tm upconversion nanoparticle (UCN) core and ZnO shell CSNPs for cancer treatment.

Main Methods:

  • Fabrication of NaYF4:Yb,Tm UCN@ZnO core-shell nanoparticles.
  • Characterization using Transmission Electron Microscopy (TEM) and Scanning Transmission Electron Microscopy (STEM).
  • Assessment of reactive oxygen species (ROS) generation via APF and ARE-FLuc assays.
  • Evaluation of cancer cell viability using MTT assay under NIR light irradiation.

Main Results:

  • Successfully synthesized UCN@ZnO CSNPs with improved photosensitizer loading efficiency.
  • UCN core effectively sensitized ZnO shell to generate ROS upon 980 nm NIR light exposure.
  • Demonstrated significant ROS generation and approximately 45% cancer cell death in MDA-MB-231 and 4T1 cells.

Conclusions:

  • The developed UCN@ZnO CSNPs show promise as a theranostic platform for photodynamic cancer therapy.
  • The core-shell architecture facilitates efficient ROS generation for targeted cancer cell killing.
  • This approach offers a viable strategy for overcoming lattice mismatch challenges in CSNP development.