[Table of Contents]

Plasma and Fusion Research

Volume 9, 1302007 (2014)

Letters

Initial Stage of Fiber-Form Nanostructure Growth on Refractory Metal Surfaces with Helium Plasma Irradiation
Shuichi TAKAMURA
Faculty of Engineering, Aichi Institute of Technology, Toyota 470-0392, Japan
(Received 20 November 2013 / Accepted 20 December 2013 / Published 31 January 2014)

Abstract

The initial stage of fiber-form nanostructure growth on tungsten and molybdenum surfaces with helium plasma irradiation is investigated by a technique that allows time evolution of nanostructure growth to its spatial variation. The pitting of the original base surface resulting from successive hole formation is clearly demonstrated. The surface fine-grained miniatuarization proceeds with increasing hole area. Then, loop-like nano-scale structures appear with some coherency, which are thought to be precursors of fiber-form tendrils. Loop raptures and branching out are considered as possible candidates of the initial stage of nano-fiber growth.

Keywords

fiber-form nanostructure, refractory metal, helium plasma, bubble, hole

DOI: 10.1585/pfr.9.1302007

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This paper may be cited as follows:

Shuichi TAKAMURA, Plasma Fusion Res. 9, 1302007 (2014).