Controlled synthesis and optical properties of pure gold nanoparticles

A.K. Singh, A.K. Rai, D.D. Bicanic

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)

Abstract

Gold nanoparticles were synthesized by laser ablation of a gold metallic disc at wavelengths of 532 nm and 355 nm with 7 ns pulse duration in the pure water. The colloidal gold nanoparticles were characterized by ultraviolet-visible absorption spectroscopy, transmission electron microscopy, and fluorescence spectrometry. The presence of a surface plasmon resonance peak around ~ 524 nm indicates the formation of gold nanoparticles. The formation efficiencies of gold nanoparticles in colloids were found to increase when ablating the gold metallic disc with a laser having a longer wavelength. The size distributions of the gold nanoparticles thus produced were measured by transmission electron microscopy. A reduction in mean diameter of the particles was observed with a decrease in the laser wavelength under the irradiation at a high fluence of 25 mJ/pulse. The fluorescence spectroscopy demonstrated that these gold nanoparticles are fluorescent, showing a strong blue emission intensity at 458 nm
Original languageEnglish
Pages (from-to)50-60
JournalInstrumentation Science and Technology
Volume37
Issue number1
DOIs
Publication statusPublished - 2009

Keywords

  • laser-ablation
  • metal nanoparticles
  • aqueous-solution
  • arthritis
  • water
  • size

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