Asynchronous melting of embedded metal nanoparticles and silica matrix for shape elongation induced by swift heavy ion irradiation

作者：Amekura H^*; Ishikawa N; Okubo N; Nakayama Y; Mitsuishi K

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2011, 269(23): 2730-2733.

DOI：10.1016/j.nimb.2011.08.011

• Swift heavy ion
• Nanoparticle
• Shape elongation
• Melting point
• Ion track

Although the mechanism of shape-elongation of nanoparticles (NPs) by swift-heavy-ion-irradiation is still under debate, melting and solidification of NPs for pico-second region by thermal spikes has been proposed as one of the processes involved. Elongation of high melting point (MP) NPs (vanadium, T(MP)(bulk) = 1890 degrees C) and of low MP NPs (zinc, T(MP)(bulk) = 420 degrees C) were compared under irradiation with 200 MeV Xe(14+) ions. Irrespective of the large difference in their MPs, both the V and Zn NPs showed comparable elongation. The insensitivity of elongation to the MP can be explained by the asynchronicity of melting of the silica and the NPs.

• 出版日期2011-12-1