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<p>Silver powder serves as the primary component in conductive silver paste, where the distribution of particle size, morphology, and dispersion significantly influence its performance. In this study, silver powder was synthesized via the liquid-phase reduction method, and the effects of pH, dispersant dosage, and reaction temperature on the morphology and particle size were systematically investigated. The findings indicated that increasing the amount of ammonia raised the solution’s pH from 8 to 11, which facilitated a transition in silver particle growth from a diffusion mode to an aggregation mode. Notably, a pH of 9 favored the formation of spherical silver powder with a uniform particle size. Furthermore, the addition of 4&#xa0;wt% polyvinylpyrrolidone (PVP) as a dispersant effectively coated the particle surfaces, reduced agglomeration, promoted nucleation, and inhibited excessive particle growth. By maintaining the reaction temperature at 30&#xa0;°C, spherical silver powder with an average particle size of approximately 0.9&#xa0;μm, a tapped density exceeding 4&#xa0;g&#xa0;cm⁻<sup>3</sup>, and excellent dispersion was ultimately obtained.</p>

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Scale-controlled preparation of micrometer-sized spherical silver powders by liquid-phase reduction method

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Junru Zuo,
  • Guanxing Zhang,
  • Mingzhu You,
  • Hongwei Dong,
  • Jianchang Zhao

摘要

Silver powder serves as the primary component in conductive silver paste, where the distribution of particle size, morphology, and dispersion significantly influence its performance. In this study, silver powder was synthesized via the liquid-phase reduction method, and the effects of pH, dispersant dosage, and reaction temperature on the morphology and particle size were systematically investigated. The findings indicated that increasing the amount of ammonia raised the solution’s pH from 8 to 11, which facilitated a transition in silver particle growth from a diffusion mode to an aggregation mode. Notably, a pH of 9 favored the formation of spherical silver powder with a uniform particle size. Furthermore, the addition of 4 wt% polyvinylpyrrolidone (PVP) as a dispersant effectively coated the particle surfaces, reduced agglomeration, promoted nucleation, and inhibited excessive particle growth. By maintaining the reaction temperature at 30 °C, spherical silver powder with an average particle size of approximately 0.9 μm, a tapped density exceeding 4 g cm⁻3, and excellent dispersion was ultimately obtained.