Elongation of metallic nanoparticles at the interface of silicon dioxide and silicon nitride

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:409

Article; Proceedings Paper

Mota-Santiago, Pablo¹  Kremer, Felipe²  Nadzri, Allina¹  Ridgway, Mark Cameron¹  Kluth, Patrick¹ 

[1] Australian Natl Univ, Dept Elect Mat Engn, Res Sch Phys & Engn, Canberra, ACT 2601, Australia

[2] Australian Natl Univ, Ctr Adv Microscopy, 131 Garran Rd, Acton, ACT 2601, Australia

关键词: Ion-irradiation;    Metallic nanoparticles;    Elongation;    Anisotropy;    TEM;   

DOI  :  10.1016/j.nimb.2017.03.068

来源: Elsevier

【 摘 要 】

In the process of shape transformation of metal nanoparticles (MNPs) embedded in dielectrics resulting from swift heavy-ion irradiation, key parameters such as the energy deposition threshold, the necessity of a molten track and the NP size have been identified for amorphous silicon dioxide. The extension of such parameters to other dielectrics is yet unclear. We present experimental evidence of the shape transformation of nearly spherical NPs located at the interface of amorphous silicon nitride and silicon dioxide thin layers upon irradiation with 185 MeV Au ions at fluences of 0.3 and 1 x 10(14) cm(-2). After irradiation the similar to 16-18 nm diameter Au and Ag NPs transformed into continuous nano-rods exhibiting a high aspect ratio with a clear preference of elongation into the silicon dioxide layer. The results are discussed in the context of Thermal Spike calculations, which indicate that the track formation timescales may have an important influence on the NP elongation process. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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