'Spillout' effect in gold nanoclusters embedded in c-Al2O3(0001) matrix

Details 'Spillout' effect in gold nanoclusters embedded in c-Al2O3(0001) matrix 'Spillout' effect in gold nanoclusters embedded in c-Al2O3(0001) matrix

2004-01-30

arxiv.org/abs/cond-mat/0401629v3

Physics

Condensed Matter

Materials Science

14 Pages (figures included); Accepted in Chem. Phys. Lett (In Press)

Scientific paper

10.1016/j.cplett.2004.10.011

Gold nanoclusters are grown by 1.8 MeV Au^\sup{2+} implantation on c-Al\sub{2}O\sub{3}(0001)substrate and subsequent air annealing at temperatures 1273K. Post-annealed samples show plasmon resonance in the optical (561-579 nm) region for average cluster sizes ~1.72-2.4 nm. A redshift of the plasmon peak with decreasing cluster size in the post-annealed samples is assigned to the 'spillout' effect (reduction of electron density) for clusters with ~157-427 number of Au atoms fully embedded in crystalline dielectric matrix with increased polarizability in the embedded system.

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