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Tailored Au nanorods: optimizing functionality, controlling the aspect ratio and increasing biocompatibility.

Xiaoqing Cai1, Cheng-Liang Wang, Hsiang-Hsin Chen

  • 1Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan.

Nanotechnology
|July 27, 2010
PubMed
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X-ray irradiation enables the synthesis of gold nanorods without reducing agents. Their aspect ratio, controllable via irradiation intensity, influences optical properties and cellular uptake.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Gold nanorods (AuNRs) are versatile nanomaterials with tunable optical properties.
  • Controlling the synthesis of AuNRs, particularly their aspect ratio, is crucial for optimizing their performance.
  • Existing synthesis methods often rely on chemical reducing agents, which can be environmentally concerning.

Purpose of the Study:

  • To develop a novel synthesis method for monodisperse gold nanorods using X-ray irradiation.
  • To investigate the influence of X-ray irradiation parameters on nanorod morphology and properties.
  • To explore the potential of X-ray driven synthesis for applications requiring specific optical and biological interactions.

Main Methods:

  • Synthesis of gold nanorod seeds and subsequent growth using X-ray irradiation.

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  • Alternative method employing chemical reduction for nanorod growth after X-ray initiated seeds.
  • Modulation of X-ray irradiation intensity during seed synthesis to control aspect ratio.

    • Main Results:

    • Achieved synthesis of monodisperse gold nanorods with high aspect ratios.
    • Demonstrated X-ray irradiation as a viable method for nanorod growth, including a route without reducing agents.
    • Established control over nanorod shape and aspect ratio by adjusting X-ray irradiation intensity.
    • Observed a correlation between nanorod aspect ratio and their absorption wavelength.
    • Found that nanorod aspect ratio affects their uptake by HeLa cells.

    Conclusions:

    • X-ray irradiation offers a controllable and potentially greener route for synthesizing gold nanorods.
    • The aspect ratio of X-ray synthesized gold nanorods can be precisely tuned, impacting their optical properties.
    • Tunable optical properties and influenced cellular uptake suggest potential applications in areas like targeted drug delivery and imaging.