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A General Strategy for Ligand Exchange on Upconversion Nanoparticles.

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We developed a simple method to coat lanthanide-doped upconversion nanoparticles with hydrophilic molecules for biomedical uses. This surface modification enhances nanoparticle stability and biocompatibility, enabling effective biomolecule immobilization for detection applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Lanthanide-doped upconversion nanoparticles (UCNPs) show promise for biomedical applications.
  • Current UCNPs often use hydrophobic oleate ligands, limiting their biological use.
  • A facile surface modification method is needed for UCNP integration into biological systems.

Purpose of the Study:

  • To develop a versatile strategy for displacing oleate ligands on UCNPs.
  • To enable the attachment of various hydrophilic molecules to UCNP surfaces.
  • To demonstrate the utility of surface-modified UCNPs in biomolecule immobilization and detection.

Main Methods:

  • A two-step ligand-exchange process: oleate removal followed by hydrophilic ligand attachment.
  • Characterization using Fourier transform infrared spectroscopy, thermogravimetry analysis, and ζ-potential measurement.
  • Assessment of nanoparticle stability, biocompatibility, and photoluminescence via electron microscopy and spectroscopy.

Main Results:

  • Successful displacement of oleate ligands and attachment of diverse hydrophilic molecules.
  • Surface-modified UCNPs exhibited enhanced stability and good biocompatibility.
  • Demonstrated direct immobilization of biotin for effective streptavidin detection.

Conclusions:

  • The developed method provides a facile and versatile approach for UCNP surface modification.
  • Surface-functionalized UCNPs are suitable for biomedical applications requiring stability and biocompatibility.
  • This strategy facilitates the use of UCNPs in sensitive biomolecule detection systems.