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Size characterisation of noble-metal nano-crystals formed in sapphire by ion irradiation and subsequent thermal annealing

journal contribution
posted on 2012-10-15, 00:00 authored by Pablo Mota Santiago, A Crespo-Sosa, J L Jiménez-Hernández, H G Silva-Pereyra, J A Reyes-Esqueda, A Oliver
Metallic nano-particles embedded in transparent dielectrics are very important for new technological applications because of their unique optical properties. These properties depend strongly on the size and shape of the nano-particles. In order to achieve the synthesis of metallic nano-particles it has been used the technique of ion implantation. This is a very common technique because it allows the control of the depth and concentration of the metallic ions inside the sample, limited mostly by straggling, without introducing other contaminant agents. The purpose of this work was to measure the size of the nano-particles grown under different conditions in Sapphire and its size evolution during the growth process. To achieve this goal, α-Al 2 O 3 single crystals were implanted with Ag or Au ions at room temperature with different fluences (from 2 × 10 16 ions/cm 2 to 8 × 10 16 ions/cm 2 ). Afterwards, the samples were annealed at different temperatures (from 600 °C to 1100 °C) in oxidising, reducing, Ar or N 2 atmospheres. We measured the ion depth profile by Rutherford Backscattering Spectroscopy (RBS) and the nano-crystals size distribution by using two methods, the surface plasmon resonance in the optical extinction spectrum and the Transmission Electron Microscopy (TEM).

History

Journal

Applied surface science

Volume

259

Pagination

574 - 581

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0169-4332

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal