Time-resolved small-angle X-ray scattering study on the growth behavior of silver nanoparticles Article

Yan, S, Wu, Z, Yu, H et al. (2014). Time-resolved small-angle X-ray scattering study on the growth behavior of silver nanoparticles . 118(21), 11454-11463. 10.1021/jp502482c



cited authors

  • Yan, S; Wu, Z; Yu, H; Gong, Y; Tan, Y; Du, R; Chen, W; Xing, X; Mo, G; Chen, Z; Cai, Q; Sun, D

fiu authors

abstract

  • Silver nanoparticles were prepared with a chemical reduction method in the presence of polyvinylpyrrolidone (PVP) used as a stabilizing agent. During the synthesis of Ag nanoparticles, aqueous silver nitrate solutions were used as the precursors and sodium borohydride was used as the reducing agent. Four Ag-nanoparticle suspensions were prepared with the initial Ag+ concentrations of 2, 4, 6, and 8 mM in the corresponding precursors. The in-situ time-resolved small-angle X-ray-scattering (SAXS) technique was used to monitor the nucleation and growth processes of Ag nanoparticles. The particle-size change with time was obtained by analyzing the SAXS data with a tangent-by-tangent method. The SAXS results demonstrate that the Ag nanoparticle growth behaves as a linear relation in the initial growth stage (<1 s), which was used to evaluate the critical particle size. The growth of Ag nanoparticles experienced a fast stage and then a slow stage in their whole formation process. A diffusion-coalescence model has been proposed to describe the growth behavior. The particle size change with growth time can be fitted well by this model. The effect of initial Ag+ concentration on the final particle size and the growth mechanism of Ag nanoparticles are discussed in this paper. © 2014 American Chemical Society.

publication date

  • May 29, 2014

Digital Object Identifier (DOI)

start page

  • 11454

end page

  • 11463

volume

  • 118

issue

  • 21