Nano Express

Nanoscale Research Letters

, 4:565

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Preparation of Ultrafine Fe–Pt Alloy and Au Nanoparticle Colloids by KrF Excimer Laser Solution Photolysis

  • Masato WatanabeAffiliated withGraduate School of Engineering, Tohoku University3R Corporation Email author 
  • , Hitoshi TakamuraAffiliated withGraduate School of Engineering, Tohoku University
  • , Hiroshi SugaiAffiliated with3R Corporation


We prepared ultrafine Fe–Pt alloy nanoparticle colloids by UV laser solution photolysis (KrF excimer laser of 248 nm wavelength) using precursors of methanol solutions into which iron and platinum complexes were dissolved together with PVP dispersant to prevent aggregations. From TEM observations, the Fe–Pt nanoparticles were found to be composed of disordered FCC A1 phase with average diameters of 0.5–3 nm regardless of the preparation conditions. Higher iron compositions of nanoparticles require irradiations of higher laser pulse energies typically more than 350 mJ, which is considered to be due to the difficulty in dissociation of Fe(III) acetylacetonate compared with Pt(II) acetylacetonate. Au colloid preparation by the same method was also attempted, resulting in Au nanoparticle colloids with over 10 times larger diameters than the Fe–Pt nanoparticles and UV–visible absorption peaks around 530 nm that originate from the surface plasmon resonance. Differences between the Fe–Pt and Au nanoparticles prepared by the KrF excimer laser solution photolysis are also discussed.


Nanoparticle Excimer laser Laser solution photolysis Precursor Fe–Pt alloy Au