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Growth of High Magnetic α-Fe2O3 and Fe3O4 Nanowires via an Oxide Assisted Vapor-Solid Process
Ming Chang*,Nai-feng Hsu
Author NameAffiliationE-mail
Ming Chang* Department of Mechanical Engineering, Chung Yuan Christian University, Zhongli 32023School of Mechanical Science and Engineering, Huazhong University of Science and Technology,Wuhan 430074, China ming@cycu.edu.tw 
Nai-feng Hsu Department of Mechanical Engineering, Chung Yuan Christian University, Zhongli 32023Department of General Education, Army Academy, Zhongli 32023  
Abstract:
We describes a controllable synthesis procedure for growing α-Fe2O3 and Fe3O4 nanowires. High magnetic hematite α-Fe2O3 nanowires are successfully grown on Fe0.5Ni0.5 alloy sub-strates via an oxide assisted vapor-solid process. Experimental results also indicate that previous immersion of the substrates in a solution of oxalic acid causes the grown nanowires to convert gradually into magnetite (Fe3O4) nanowires. Additionally, the saturated state of Fe3O4 nanowires is achieved as the oxalic acid concentration reaches 0.75 mol/L. The aver-age diameter and length of nanowires expands with an increasing operation temperature and the growth density of nanowires accumulates with an increasing gas flux in the vapor-solid process. The growth mechanism of α-Fe2O3 and Fe3O4 nanowires is also discussed. The results demonstrate that the entire synthesis of nanowires can be completed within 2 h.
Key words:  Oxide assisted vapor-solid process, Fe3O4 NWs, α-Fe2O3 NWs, Oxalic acid, Magnetic material
FundProject:
利用氧化辅助气固法生长高磁性的α-Fe2O3和Fe3O4纳米线
章明*,许乃锋
摘要:
探讨生长α-Fe2O3和Fe3O4纳米线的一个可控制的合成过程. 在研究中发现,高磁性的α-Fe2O3纳米线已经成功地利用氧化辅助气固法结晶生成于Fe0.5Ni0.5合金基板上;若基板事先浸泡于草酸溶液中,随草酸浓度的增加,所生长的纳米线晶相会逐转变为Fe3O4,当草酸浓度达到0.75 mol/L时,所生长的纳米线几乎全部转变成Fe3O4晶相. 此外,实验结果也显示所生长的纳米线长度及直径会随着气固过程中的温度上升而增加,生长密度则会随着气固过程中的流量加大而上升. 此过程所提出的合成程序可在2 h內完成.
关键词:  氧化辅助气固法,Fe3O4纳米线,α-Fe2O3纳米线,草酸,磁性材料
DOI:10.1088/1674-0068/24/01/109-114
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