2000 Fiscal Year Final Research Report Summary
Constructing a field-emission (FE) x-ray tube
| Project/Area Number |
10450036
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
OKUYAMA Fumio Nagoya Institute of Technology, Graduate School of Engineering, Professor, 工学研究科, 教授 (30024235)
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| Co-Investigator(Kenkyū-buntansha) |
SUGIE Hiroshi Nagoya Institute of Technology, Department of Engineering, Instructor, 工学部, 助手 (40024327)
TANEMURA Masaki Nagoya Institute of Technology, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (30236715)
KITA Shigetomo Nagoya Institute of Technology, Department of Engineering, Professor, 工学部, 教授 (60006153)
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| Project Period (FY) |
1998 – 2000
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| Keywords | nanomaterials / nanowires / field ion emission / carbon nanotubes |
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| Research Abstract |
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 growth
This 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 research
In 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.
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