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以低沸点溶剂正庚烷作为反应介质,三辛基膦和辛胺为稳定剂,在高压釜反应器中高压临氢条件下热分解还原乙酰丙酮铁,制备单质铁纳米粒子。X射线粉末衍射数据表明产物为纯净的单质α-铁,电子衍射结果进一步证明了这一结论;透射电镜图像(TEM)显示,所得产物为平均粒径11.5nm的类球型纳米粒子;从高分辨透射电镜图像(HRTEM)观察到体心结构α-铁的超晶格,表明制备的铁纳米粒子具有较好的结晶度;利用交变梯度磁强计测定了纳米粒子的磁学性质,结果表明纳米粒子具有超顺磁性,比饱和磁化强度为121emu/g。
Using low-boiling solvent n-heptane as the reaction medium, trioctylphosphine and octylamine as stabilizers, iron acetylacetonate was thermally decomposed and reduced under high pressure hydrogen in an autoclave reactor to prepare single-material iron nano-particles. X-ray powder diffraction data show that the product is pure elemental α-Fe, electron diffraction results further confirmed this conclusion; TEM image shows that the resulting product is a spherical average particle size of 11.5nm nanoparticles; from high The HRTEM images of the α-Fe superlattices of the body-centered structure were observed, indicating that the prepared iron nanoparticles have good crystallinity. The magnetic properties of the nanoparticles were measured by an alternating gradient magnetometer. The results It shows that the nanoparticles have superparamagnetism and the specific saturation magnetization is 121 emu / g.