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Journal Articles

In situ transmission electron microscopy observation of melted germanium encapsulated in multilayer graphene

Suzuki, Seiya; Nemoto, Yoshihiro*; Shiiki, Natsumi*; Nakayama, Yoshiko*; Takeguchi, Masaki*

Annalen der Physik, 535(9), p.2300122_1 - 2300122_12, 2023/09

https://doi.org/10.1002/andp.202300122
 Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)

Journal Articles

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

Amekura, Hiroshi*; Ishikawa, Norito; Okubo, Nariaki; Nakayama, Yoshiko*; Mitsuishi, Kazuki*

Nuclear Instruments and Methods in Physics Research B, 269(23), p.2730 - 2733, 2011/12

https://doi.org/10.1016/j.nimb.2011.08.011
 Times Cited Count：13 Percentile：69.55(Instruments & Instrumentation)

Although the mechanism of shape-elongation of nanoparticles (NPs) by swift-heavy-ion-irradiation is still under debate, melting and solidification for pico-seconds of NPs by thermal spikes has been proposed as one of the processes involved. Elongation of high melting point (MP) NPs (vanadium, $$T$$$$_{rm MP}^{rm bulk}$$ = 1890 $$^{circ}$$C) and of low MP NPs (zinc, $$T$$$$_{rm MP}^{rm bulk}$$ = 420 $$^{circ}$$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.

Journal Articles

Zn nanoparticles irradiated with swift heavy ions at low fluences; Optically-detected shape elongation induced by nonoverlapping ion tracks

Amekura, Hiroshi*; Ishikawa, Norito; Okubo, Nariaki; Ridgway, M.*; Giulian, R.*; Mitsuishi, Kazuki*; Nakayama, Yoshiko*; Buchal, C.*; Mantl, S.*; Kishimoto, Naoki*

Physical Review B, 83(20), p.205401_1 - 205401_10, 2011/05

https://doi.org/10.1103/PhysRevB.83.205401
 Times Cited Count：35 Percentile：78.35(Materials Science, Multidisciplinary)

Elongation of metal nanoparticles (NPs) embedded in silica induced by swift heavy-ion irradiation, from spheres to spheroids, has been evaluated at low fluences by linearly polarized optical absorption spectroscopy. It is important to clarify whether the high fluences, i.e., track overlaps, are essential for the elongation. Zn NPs embedded in silica were irradiated with 200-MeV Xe ions. The comparison with numerical simulation suggested that the elongation of Zn NPs was induced by nonoverlapping ion tracks.

Oral presentation

In situ transmission electron microscopy observation of melted germanium sandwiched by multilayer graphenes

Suzuki, Seiya; Nemoto, Yoshihiro*; Shiiki, Natsumi*; Nakayama, Yoshiko*; Takeguchi, Masaki*

no journal, , 

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