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Reductant-dependent DNA-templated silver nanoparticle formation kinetics.

Zi-Yang Yang1, Wen-Yan Jiang1, Shi-Yong Ran1

  • 1Department of Physics, Wenzhou University, Wenzhou 325035, China. syran@wzu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|August 22, 2023
PubMed
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DNA-templated silver nanoparticle (AgNP) synthesis kinetics were studied using magnetic tweezers. Different reductants like sodium borohydride (NaBH₄), L-ascorbic acid, and sodium citrate influence AgNP nucleation and growth rates.

Area of Science:

  • * Nanotechnology
  • * Materials Science
  • * Biophysics

Background:

  • * DNA molecules serve as effective templates for synthesizing silver nanoparticles (AgNPs) with controlled properties.
  • * Understanding the formation kinetics of DNA-templated AgNPs is essential for optimizing their synthesis.
  • * Magnetic tweezers offer a precise method for studying molecular interactions and kinetics.

Purpose of the Study:

  • * To investigate the reduction and nucleation kinetics of Ag+-DNA structures using various reducing agents.
  • * To elucidate the influence of reductant type and concentration on AgNP formation pathways.
  • * To analyze the observed kinetics within the framework of classical nucleation theory.

Main Methods:

  • * Employed magnetic tweezers to monitor DNA extension changes, reflecting AgNP formation.

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  • * Studied the kinetics of Ag+-DNA structures upon addition of sodium borohydride (NaBH₄), L-ascorbic acid, and sodium citrate.
  • * Varied the concentrations of Ag+ and the ratio of reductant to Ag+ ([NaBH₄]/[Ag+]).

    • Main Results:

    • * Sodium borohydride (NaBH₄) addition showed concentration-dependent kinetics: restoration at low ratios, followed by nucleation-dissolution or direct nucleation and growth at higher ratios.
    • * L-ascorbic acid exhibited distinct increase-decrease kinetics, suggesting initial slow nucleation.
    • * Sodium citrate demonstrated a weak ability to promote AgNP nucleation.

    Conclusions:

    • * The kinetics of DNA-templated AgNP formation are highly dependent on the type and concentration of the reducing agent.
    • * Classical nucleation theory provides a framework for understanding how supersaturation, influenced by reductant strength, governs AgNP formation pathways.
    • * Precise control over synthesis conditions is crucial for tailoring AgNP properties via DNA templating.