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Fixed-diameter upconversion nanorods with controllable length and their interaction with cells.

Dexin Chen1, Mengyuan Xu2, Yanyue Liu1

  • 1State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China.

Journal of Colloid and Interface Science
|November 4, 2017
PubMed
Summary

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Researchers synthesized tunable upconversion nanorods (NaYF₄: Yb, Er) by controlling precursor ratios. Longer nanorods showed decreased cellular uptake, while smaller diameters increased it, impacting biomedical applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Upconversion nanoparticles (UCNPs) offer unique optical properties for bioimaging.
  • Controlling nanoparticle morphology is crucial for optimizing their performance and cellular interactions.

Purpose of the Study:

  • To develop a method for synthesizing NaYF₄: Yb, Er upconversion nanorods with controlled dimensions.
  • To investigate the impact of nanorod length and diameter on their optical properties and cellular uptake.

Main Methods:

  • Synthesis of NaYF₄: Yb, Er nanorods via precursor injection into a ligand solution.
  • Systematic variation of sodium trifluoroacetate (CF₃COONa) and potassium trifluoroacetate (CF₃COOK) ratios.
  • Characterization of nanorod dimensions (length and diameter) and optical properties.
Keywords:
Cellular uptakeCytotoxicityShape controlUpconversion nanorods

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  • Assessment of cellular uptake of nanorods with varying sizes.

    • Main Results:

    • Achieved controllable nanorod length (40-200 nm) with fixed diameter (37-42 nm) by adjusting precursor ratios.
    • Elongated nanorods exhibited altered red/green fluorescence intensity.
    • Cellular uptake decreased with increasing nanorod length at a fixed diameter.
    • Decreasing nanorod diameter significantly increased cellular uptake.

    Conclusions:

    • Precise control over upconversion nanorod dimensions is achievable.
    • Nanorod length and diameter critically influence cellular uptake efficiency.
    • Findings provide insights for designing nanocrystals for cell-targeted biomedical applications.