Controlled shape modification of embedded Au nanoparticles by 3 MeV Au2+-ion irradiation
| Autor: | M. Sasase, Hiroshi Amekura, D.P. Datta, Yoshihiko Takeda, N. Kishimoto |
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| Rok vydání: | 2014 |
| Předmět: |
Ostwald ripening
Materials science Absorption spectroscopy business.industry Analytical chemistry General Physics and Astronomy Nanoparticle Surfaces and Interfaces General Chemistry Condensed Matter Physics Fluence Surfaces Coatings and Films Ion symbols.namesake Optics Transmission electron microscopy symbols Irradiation Surface plasmon resonance business |
| Zdroj: | Applied Surface Science. 310:164-168 |
| ISSN: | 0169-4332 |
| Popis: | Shape modification of embedded Au nanoparticles by 3 MeV Au 2+ -ion irradiation has been studied by cross-sectional transmission electron microscopy (XTEM). The ion irradiation on spherical Au nanoparticles shallowly-embedded in SiO 2 caused a well-controlled transformation of shape to ellipsoidal. Satellite nanoparticles of smaller sizes were found to nucleate around the ellipsoids. Rapid growth of the ellipsoidal nanoparticles was observed as the applied fluence increased from 3 × 10 15 to 7 × 10 15 ions cm −2 . The XTEM study also revealed the crystallinity of the ellipsoids formed by MeV ion irradiation. Reduction in the surface plasmon resonance (SPR) peak intensity in the optical absorption spectrum indicates partial dissolution of the spherical nanoparticles by ion irradiation. We have thus obtained a unique near-surface structure of ellipsoidal nanoparticles. The results are discussed in terms of effects of ion energy deposition and inverse Ostwald ripening. |
| Databáze: | OpenAIRE |
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