Preparation of Ultrafine Fe-Pt Alloy and Au Nanoparticle Colloids by KrF Excimer Laser Solution Photolysis
Preparation of Ultrafine Fe-Pt Alloy and Au Nanoparticle Colloids by KrF Excimer Laser Solution Photolysis
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DOI：
10.1007/s11671-009-9281-2
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发表时间：
2009-06-01
影响因子：
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通讯作者：
Sugai, Hiroshi
中科院分区：
文献类型：
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作者：
Watanabe, Masato;Takamura, Hitoshi;Sugai, Hiroshi
我们使用甲醇溶液作为前体，将铁和铂络合物溶解在其中，并与 PVP 分散剂一起溶解以防止聚集，通过紫外激光溶液光解（波长 248 nm 的 KrF 准分子激光）制备超细铁铂合金纳米粒子胶体。从TEM观察发现，无论制备条件如何，Fe-Pt纳米颗粒均由平均直径为0.5-3 nm的无序FCC A1相组成。纳米粒子的较高铁成分需要较高的激光脉冲能量的照射，通常超过350 mJ，这被认为是由于与乙酰丙酮铂(II)相比，乙酰丙酮铁(III)较难解离。还尝试用相同的方法制备Au胶体，得到的Au纳米颗粒胶体的直径比Fe-Pt纳米颗粒大10倍以上，并且在530 nm附近有源自表面等离子体共振的紫外-可见吸收峰。还讨论了 KrF 准分子激光溶液光解制备的 Fe-Pt 和 Au 纳米颗粒之间的差异。
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.