Growth process of nano-tendril bundles with sputtered tungsten. (January 2019)

• Record Type: Journal Article
• Authors: Hwangbo, Dogyun; Kajita, Shin; Tanaka, Hirohiko; Ohno, Noriyasu
• Is Part Of: Nuclear materials and energy. Volume 18(2019)
• Page Start: 250
• Page End: 257
• Publication Date: 2019-01
• Subjects: Fuzz -- Helium -- Impurity seeding -- Sputtering -- Deposition -- Tungsten; Nuclear energy -- Periodicals; Nuclear fuels -- Periodicals; Nuclear reactors -- Materials -- Periodicals; Radioactive substances -- Periodicals; 621.4833
• DOI: 10.1016/j.nme.2019.01.008
• Languages: English
• ISSNs: 2352-1791

Abstract

Highlights: Nano-tendril bundles (NTBs) morphologies were dependent on net erosion yield of sample. The size and the number of NTBs increased with increasing the ion fluence—Micro-protrusions continuously formed regardless of ion fluence. Sputtering and re-deposition process would enable micro-protrusions to grow larger and become NTBs. Abstract: Nano-tendril bundles (NTBs) were generated in DC He plasma with impurity gas-seeding (Ne and N2 ) under sputtering-dominated conditions. NTB morphologies were characterized using the net erosion yield of samples. NTBs' height and area were analyzed and ion fluence dependence was discussed. For both impurities, the number of NTBs increased steadily with increasing the fluence. It was revealed that NTB can be generated newly and continuously regardless of ion fluence. Surface observations suggested that micro-protrusions can evolve into NTBs. The effect of re-deposition of W was discussed based on SEM observations. Line-of-sight deposition seemed to play a key role of W feeder to enable NTBs to grow greater.