Hydrothermal Synthesis of Magnetic Single Crystals in Thermally and Chemically Stable Reaction Fields of One-Dimensional Nano Space

一维纳米空间热稳定反应场和化学稳定反应场水热合成磁性单晶

基本信息

批准号：
15310068
负责人：
KYOTANI Takashi
金额：
$ 9.15万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

By chemical vapor deposition of propylene over an anodic aluminum oxide (AAO) film, not only the outer surface but also the inner surface of AAO nanochannels can be fully covered with carbon. The carbon-coated nanochannels can be used as a template in hydrothermal treatment that requires sever alkaline conditions. In the first year we reported our attempt at the synthesis of single crystal nanorods by hydrothermal reaction of nickel compounds in the cavity of the carbon-coated nanochannels and demonstrated that hydrothermal synthesis method can be applied to template-based preparation of nano-sized materials. However, we had some difficulty to insert ferromagnetic metal into the nanochannels using this hydrothermal method. Then we found that ferromagnetic metal (Permalloy) was electrochemically deposited on the carbon-coated nanochannels in the AAO layer in an electroplating bath. Moreover, not only soft magnetic alloy such as Permalloy but also hard magnetic materials such as nickel metal were able to be deposited.In the above electroplating method, Permalloy deposition had never been observed inside the nanotubes, but only on the external surface, when we used the carbon-coated AAO film as a cathode for the electroplating of Permalloy. We then removed only the carbon deposited on the external surface of the AAO film with leaving carbon inside the channels and found metal deposition in the cavity of the nanotubes. This is because electroplating into nano space surrounded by electro-conductive material (carbon) is very difficult. However, for the application of high-density magnetic recoding media, such carbon layer on the external surface should be kept, because the carbon can play a role of a protective and lubricated layer. We thus make every effort to electro-chemically deposit Permalloy in the carbon-coated nanochannels in the AAO and finally have succeeded in such deposition by precisely controlling the electroplating conditions.

丙烯在阳极氧化铝（AAO）膜上的化学蒸气沉积不仅是外表面，而且还可以用碳充分覆盖AAO纳米渠道的内表面。碳涂层的纳米通道可用作需要严重碱性条件的热液处理中的模板。在第一年，我们报告了我们通过在碳涂层的纳米渠道中的镍化合物的热液反应合成单晶纳米棒的尝试，并证明可以将热液合成方法应用于基于模板的纳米材料制备。但是，我们使用这种热液方法将铁磁金属插入纳米通道时遇到了一些困难。然后，我们发现铁磁金属（Permalloy）被电化学沉积在电镀浴中AAO层的碳涂层纳米通道上。此外，不仅软磁合金（例如permalloy），而且还可以沉积硬磁性材料，例如镍金属。使用了碳涂层的AAO膜作为Permalloy电镀的阴极。然后，我们仅除去沉积在AAO膜外表面上的碳，并在通道内留下碳，并在纳米管腔中发现了金属沉积。这是因为将电导材料包围的纳米空间（碳）非常困难。但是，对于应用高密度磁性重现介质的应用，应保留这种碳层，因为碳可以发挥保护性和润滑层的作用。因此，我们竭尽全力将薄膜沉积在AAO中的碳涂层纳米通道中，并最终通过精确控制电镀条件来成功进行这种沉积。