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Constructing a field-emission (FE) x-ray tube

构建场发射 (FE) X 射线管

基本信息

批准号：
10450036
负责人：
OKUYAMA Fumio
金额：
$ 9.02万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10450036/
关键词：
nanomaterials nanowires field ion emission carbon nanotubes カーボンチューブ

项目摘要

This project was aimed at establishing a technique to prepare carbon nanotubes (CNTs) having a metallic filament inside. The results obtained are outlined as follows.1) Field anode growth (FAG)Usually, FAG-grown CNTs are filled with a metallic matter, but some CNTs are completely filled with a Cr wire, lengthening up to 10-15 μm. In general, CNTs grown on field anodes undergo a straight growth from the substrate, with a few exceptions. Typical exceptional cases are ; "bridging" CNTs connecting the adjacent CNTs and "child" CNTs grown from the side face of thick CNTs.2) Field cathode growthThis type of CNT growth needs Fe, Ni or Co as catalyst. The CNTs thus grown are always topped with a metallic nanocrystal, and are characterized by straight growth along electric field lines. The latter fact enables us to prepare the so-called "aligned CNTs, " which can serve as the field-electron source in an electron-beam tool. Recently, we successfully applied our aligned CNTs to the electron source of a compact x-ray tube, the result of which is to be published in the April-23 issue of Applied Physics Letters.3) Newest researchIn the last stage of this project, we noticed that, like Fe, Ni and Co, palladium (Pd) catalytically promotes the CNT growth on field anodes. This sort of CNTs are capped with Pd nanocrystals. The hydrogen-occlusion behavior of such Pd nanocrystals will be soon investigated at our laboratory.

本课题的目的是建立一种制备内部具有金属丝的碳纳米管（CNT）的技术。1）场阳极生长（FAG）通常，场阳极生长的碳纳米管中填充有金属物质，但有些碳纳米管完全填充有Cr丝，长度可达10-15 μm。一般来说，除了少数例外，在场阳极上生长的CNT经历从衬底的直线生长。典型的例外情况是：连接相邻CNT的“桥接”CNT和从厚CNT的侧面生长的“子”CNT。2）场阴极生长这种类型的CNT生长需要Fe、Ni或Co作为催化剂。这样生长的碳纳米管的顶部总是有一个金属的覆盖物，其特征是沿着电场线直线生长。后一个事实使我们能够制备所谓的“对齐的碳纳米管”，它可以作为电子束工具中的场电子源。最近，我们成功地将我们的定向碳纳米管应用于紧凑型X射线管的电子源，其结果将发表在4月23日的应用物理快报上。3）最新研究在该项目的最后阶段，我们注意到，像Fe，Ni和Co一样，钯（Pd）催化促进场阳极上的碳纳米管生长。这种碳纳米管被Pd纳米晶体覆盖。这种钯纳米晶体的氢吸留行为将很快在我们的实验室进行研究。