Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Preparation of Ultrafine Fe–Pt Alloy and Au Nanoparticle Colloids by KrF Excimer Laser Solution Photolysis | Nanoscale Res Lett 2009 4 565-573 DOI S11671-009-9281-2 NANO EXPRESS Preparation of Ultrafine Fe-Pt Alloy and Au Nanoparticle Colloids by KrF Excimer Laser Solution Photolysis Masato Watanabe Hitoshi Takamura Hiroshi Sugai Received 25 December 2008 Accepted 19 February 2009 Published online 10 March 2009 to the authors 2009 Abstract 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 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. Keywords Nanoparticle Excimer laser Laser solution photolysis Precursor Fe-Pt alloy Au M. Watanabe El H. Takamura Graduate School of Engineering Tohoku University 301-2-2 6-6-11 Aza-Aoba Aramaki Aoba-ku Sendai 980-8579 Japan e-mail masato@ M. Watanabe H. Sugai 3R Corporation 5F 4-10-3 Chuo Aoba-ku Sendai 980-0021 Japan Introduction Recently nanomaterials have been researched due to their diverse application potentials. Particular attention has focused on nanoparticles of Fe-Pt alloys because they demonstrate potentials for ultra-high density recording .
