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Hydroquinone Based Synthesis of Gold Nanorods
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Two step continuous method to synthesize colloidal spheroid gold nanorods.

S Chandra1, J Doran2, S J McCormack1

  • 1School of Engineering, Trinity College Dublin, The University of Dublin, Ireland.

Journal of Colloid and Interface Science
|August 24, 2015
PubMed
Summary

Researchers developed a continuous two-step process to synthesize gold nanorods. Adjusting the ratio of ascorbic acid to silver nitrate controls nanoparticle shape, yielding spheroid gold nanorods with specific aspect ratios.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Colloidal Chemistry

Background:

  • Gold nanoparticles exhibit unique optical properties.
  • Controlling nanoparticle shape is crucial for tuning these properties.
  • Continuous synthesis methods offer advantages in scalability and efficiency.

Purpose of the Study:

  • To develop a continuous, two-step synthesis for spheroid gold nanorods.
  • To investigate the influence of reactant ratios on nanoparticle morphology.
  • To characterize the optical properties of the synthesized gold nanorods.

Main Methods:

  • A two-step continuous synthesis involving gold precursor reduction and subsequent growth.
  • Controlled addition of silver nitrate and ascorbic acid to manipulate shape.
Keywords:
Spheroid gold nanorodsSurface plasmon resonanceTwo-step method

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  • Characterization of nanoparticle size, shape, and optical properties.

    • Main Results:

    • Spheroid gold nanorods with aspect ratios of ~1.85-2.2 were synthesized at specific ascorbic acid to silver nitrate weight ratios (1.35-1.75).
    • Spherical nanoparticles were formed at lower weight ratios (0.5-1.1).
    • An alkaline medium enhanced gold nanorod yield and reduced reaction time at room temperature.

    Conclusions:

    • The developed continuous process enables controlled synthesis of spheroid gold nanorods.
    • Morphology control is achievable by adjusting the weight ratio of ascorbic acid to silver nitrate.
    • Synthesized gold nanorods exhibit stable optical properties in ethanol, with a slight red shift in surface plasmon resonance.