Positron annihilation study of cavities in black Au films

0476823 - FZÚ 2018 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Melikhova, O. - Čízek, J. - Hruška, P. - Vlček, M. - Procházka, I. - Anwand, W. - Novotný, Michal - Bulíř, Jiří
Positron annihilation study of cavities in black Au films.
Journal of Physics: Conference series. Vol. 791. Bristol: IOP Publishing Ltd., 2017, s. 1-4, č. článku 012018. ISSN 1742-6588.
[International Workshop on Slow Positron Beam Techniques and Applications /14./ (SLOPOS 2016). Kunibiki MesseMatsue (JP), 22.05.2016-27.05.2016]
Grant CEP: GA ČR GBP108/12/G043
Institucionální podpora: RVO:68378271
Klíčová slova: black gold * porous metal * evaporation * positron annihilation spectroscopy
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Defects in a black Au film were studied using variable energy positron annihilation spectroscopy. Black Au films exhibit porous morphology similar to cauliflower. This type of structure enhances the optical absorption due to a multiple reflections in the micro-cavities. A nanostructured black Au film was compared with conventional smooth Au films with high reflectivity. The black Au film exhibited a remarkably enhanced S-parameter in sub-surface region. This is caused by a narrow para-Positronium contribution to the annihilation peak.
Trvalý link: http://hdl.handle.net/11104/0273238