Physics – Condensed Matter – Materials Science
Scientific paper
2011-05-13
Journal of Physics and Chemistry of Solids 70 (2009) 459--465
Physics
Condensed Matter
Materials Science
Scientific paper
10.1016/j.jpcs.2008.11.012
Silver nanoparticles embedded in a dielectric matrix are investigated for their potential as broadband-absorbing optical sensor materials. This contribution focuses on the electrical properties of silver nanoparticles at various morphological stages. The electrical current through thin films, consisting of silver nanoparticles, was characterized as a function of film thickness. Three distinct conductivity zones were observed. Two relatively flat zones ("dielectric" for very thin films and "metallic" for films thicker than 300 - 400 {\AA}) are separated by a sharp transition zone where percolation dominates. The dielectric zone is characterized by isolated particle islands with the electrical conduction dominated by a thermally activated tunneling process. The transition zone is dominated by interconnected silver nanoclusters - a small increase of the film thickness results in a large increase of the electrical conductivity. The metallic conductivity zone dominates for thicknesses above 300 - 400 {\AA}.
Eilers Hergen
Wei Haoyan
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