中国激光, 2004, 31 (9): 1132, 网络出版: 2006-06-12  

激光烧蚀铁丝法制备γ-Fe2O3纳米粉

Preparation of γ-Fe2O3 Nanoparticles by Laser Ablation of Fe Wire
作者单位
华中科技大学激光技术国家重点实验室, 湖北 武汉 430074
摘要
提出脉冲激光烧蚀细丝制备纳米粉末的新方法,并根据该方法设计和制作了相应的纳米粉末制备装置。采用该方法和相应的实验装置,以??0.5 mm的纯铁细丝为原料,在一定压力的N2和O2的混合反应气氛中获得了磁性γ-Fe2O3纳米粉末。γ-Fe2O3纳米粉末在形貌上呈链状,单个颗粒基本呈球形;纳米粉末的粒度均匀,平均粒径约为19 nm,而且基本不存在硬团聚。为了对比研究,在同样的实验条件下进行了激光烧蚀铁块状靶材制备γ-Fe2O3纳米粉末的研究。与激光烧蚀块状靶材不同,激光烧蚀细丝法在烧蚀机理上实现了对靶材的整体爆炸式蒸发,从而大幅度提高了纳米粉末的产量。在400 W的功率下,激光烧蚀铁丝制备的γ-Fe2O3纳米粉末的产率为1.8 g/h,是同等条件下烧蚀块状Fe靶材制备纳米粉末产率的6倍。
Abstract
In this paper, a new method of nanoparticle preparation by laser ablation of tiny wire is reported. Moreover, an archetypal equipment is designed and manufactured. In experiments, magnetism γ-Fe2O3 nanoparticles are prepared by laser ablation of 0.5 mm diameter pure iron wire in a mixture of nitrogen and oxygen. The prepared γ-Fe2O3 nanoparticles are basically spherical in shape and form chain-like structure because of their magnetism. Besides, the prepared nanoparticles are uniform in granularity with little agglomeration and the average diameter is about 19 nm. For comparison, preparation of γ-Fe2O3 nanoparticles by laser ablation of Fe bulk material is also conducted under the same condition. Laser ablation of iron wire can realize explosive evaporation of the target, which is different from that laser ablation of bulk iron target in mechanism and may cause the production increase greatly. The production rate of γ-Fe2O3 nanoparticles by laser ablation of iron wire is about 1.8 g/h under 400 W laser output, almost 6 times as much as that by laser ablation of bulk iron target under the same condition.

王泽敏, 刘勇, 戢明, 曾晓雁. 激光烧蚀铁丝法制备γ-Fe2O3纳米粉[J]. 中国激光, 2004, 31(9): 1132. 王泽敏, 刘勇, 戢明, 曾晓雁. Preparation of γ-Fe2O3 Nanoparticles by Laser Ablation of Fe Wire[J]. Chinese Journal of Lasers, 2004, 31(9): 1132.

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