Basic study on nanotip electron emitter for micro X-ray tube

2016 Fiscal Year Final Research Report

• Project/Area Number: 26670302
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Medical Physics and Radiological Technology
• Research Institution: Kyoto College of Medical Science
• Principal Investigator: Hayashi Shigeki 京都医療科学大学, 医療科学部, 教授 (90395228)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 電界放射電子源 / 窒化物薄膜 / タングステン / 電子顕微鏡 / 電界計算シミュレーション

Outline of Final Research Achievements

In this study, a steep nanotip electron emitter was fabricated by using a field emission induced growth of multi-crystalline tungsten tip covered with insulator nitride thin film by supplying high-voltage. The nanotip was also ascertained to make single-crystalline structure, by using a transmission electron microscope (TEM) and to have electron diffraction pattern of <110> direction. This growth procedure must be related to the covered insulating thin film, in which tungsten tip would be electrically migrated and penetrated, and finally grown and single-crystallized. This growth technique of the nanotip electron emitter must be widely utilized to manufacture a high-brightness electron source. Furthermore, this must be applied to manufacture a micro X-ray tube with diameter of a few millimeter, especially for medical use like a fiber scope.

Free Research Field

電子線源、医療用マイクロX線管