Abstract
Gold ions were implanted at an energy of 1.1 MeV into (1 0 0) oriented MgO single crystals. In order to form gold colloids from the as-implanted samples, the samples were annealed in three different kinds of atmospheres: (1) Ar only, (2) 10% H 2 + 90% Ar, and (3) 10% O 2 + 90% Ar. Annealing over 1200°C enhanced the gold colloid formation as is evident from the appearance of the surface plasmon resonance band of gold. The surface plasmon bands of samples annealed in three kinds of atmospheres were found to be at 560 nm (Ar only), 524 nm (H 2 + Ar), and 560 nm (O 2 + Ar). The band positions of surface plasmon can be reversibly changed by an additional annealing. Fe 3+ impurities in the MgO samples are utilized to monitor the degree of reduction or oxidation of the samples due to annealing. From the absorption measurements of Fe 3+ band, the diffusion constants of F-centers were obtained. We found that the shifts of the surface plasmon bands are correlated with the F-center concentration and that the F n-center (aggregates of F-centers) is responsible for the shifting of the surface plasmon bands. We propose a model to explain the shift of surface plasmon band.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
