کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
595709 | 1454023 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Preparation of ultrafine FePt nanoparticles by chemical reduction in PAMAM-OH template Preparation of ultrafine FePt nanoparticles by chemical reduction in PAMAM-OH template](/preview/png/595709.png)
Using dendrimer templates, FePt nanoparticles with narrow size-distribution were prepared by a simple chemical reduction method at room temperature. In this approach, PAMAM-OH dendrimers act as templates in which metal ions are coordinated in, and NaBH4 acts as reductant. The FePt nanoparticles were synthesized in aqueous solution. The as-made FePt nanoparticles are spherical with an average size of ∼3 nm and have the chemically disordered face-center-cubic (fcc) structure. The FePt nanoparticles can be transformed to the face-center-tetragonal (fct) phase after annealing at 700 °C for 1 h. The as-prepared fcc FePt nanoparticles are found to be superparamagnetic at room temperature. After annealing in a reducing atmosphere, the FePt nanoparticles transform to ferromagnetic and show high covercivity. The structural and magnetic properties of the as-made and annealed FePt nanoparticles were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and alternating gradient magnetometry (AGM).
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 349, Issues 1–3, 5 October 2009, Pages 23–28