Research Paper

Journal of Nanoparticle Research

, 11:2023

First online:

Laser-induced growth and reformation of gold and silver nanoparticles

  • Seol Ji KimAffiliated withSchool of Chemistry, Seoul National University
  • , Chil Seong AhAffiliated withSchool of Chemistry, Seoul National UniversityElectronics and Telecommunications Research Institute
  • , Du-Jeon JangAffiliated withSchool of Chemistry, Seoul National University Email author 

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The sizes, shapes, and growth rates of gold and silver nanoparticles stabilized with polyvinylpyrrolidone in water can be controlled by using picosecond laser pulses. The nucleation of small metal clusters formed with NaBH4 addition to produce nanoparticles takes two months with aging but 30 min with laser irradiation. Laser pulses can also induce nanoparticles to have narrow size and shape distribution or to undergo aggregation into much larger particles. The latter process is more likely found when the metal is silver or the irradiation wavelength is short. Laser-induced growth and shape transformation processes are explained in terms of BH4 depletion, metal fusion, and electron ejection followed by disintegration.


Nucleation Optical fabrication Picosecond pulses Polyvinylpyrrolidone Shape transformation Colloids