[Table of Contents]

Plasma and Fusion Research

Volume 9, 1405131 (2014)

Regular Articles

Temperature Range for Fiber-Form Nanostructure Growth on Molybdenum Surfaces due to Helium Plasma Irradiation
Shuichi TAKAMURA
Faculty of Engineering, Aichi Institute of Technology, Toyota 470-0392, Japan
(Received 1 May 2014 / Accepted 2 July 2014 / Published 17 September 2014)

Abstract

Nanostructure formation on molybdenum surfaces due to helium plasma exposure is investigated, with a focus on determining the temperature band for the growth of fiber-form nanostructures. Precise temperature measurements can be obtained using thin thermocouples inserted into sheet specimens. The temperature range for nanostructure growth was determined to be 800 ∼ 1050 K under incident helium ion energies of 50 ∼ 100 eV and an ion flux of 2×1021 m−2 ·s−1. Surface morphologies near the upper and lower boundary temperatures differ from those of a standard fiber-form nanostructure. In a standard case, nano-fibers of molybdenum were found to have diameters of approximately 50 nm, whereas those of tungsten are half of the molybdenum fibers.

Keywords

fiber-form nanostructure, molybdenum, helium defect, surface temperature

DOI: 10.1585/pfr.9.1405131

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This paper may be cited as follows:

Shuichi TAKAMURA, Plasma Fusion Res. 9, 1405131 (2014).