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- Title
Au Nanoparticle Clusters: A New System to Model Hopping Conduction.
- Authors
Kurdak, Ç.; Kim, J.; Farina, L. A.; Lewis, K. M.; Bai, X.; Rowe, M. P.; Matzger, A. J.
- Abstract
We study electrical transport through self-assembled Au nanoparticle clusters which can be viewed as a new model system to study hopping transport. The physics of such systems is governed by two parameters: the charging energy and tunnel coupling b etween the particles. The charging energy is determined by the size of the nanoparticles. When the diameter of the nanoparticles is less than 4-5 nm the charging energy is large enough that Coulomb blockade effects were observed in electrical transport e ven at room temperature. The magnitude of the tunnel coupling between the particles was determined by the thiol coating used. To study a wide range of tunnel couplings, we have synthesized gold nanoparticles with various thiol coatings, including 1-octan ethiol, 1-dodecanethiol, 1-octadecanethiol, 4-mercaptodiphenylacetylene, 4-nitro-4-mercaptodiphenylacetylene, and 3,5-dinitro-4-mercaptodiphenylacetylene. Current-voltage characteristics were found to be strongly dependent on both the coating and the size of the nanoparticles. At low temperature we have observed nonlinear I-V characteristics with a threshold voltage that was significantly larger in gold nanoparticle clusters where the thiol coating had weak tunnel coupling.
- Subjects
NANOPARTICLES; THIOLS; SURFACE coatings; COULOMB functions; GOLD
- Publication
Turkish Journal of Physics, 2003, Vol 27, Issue 5, p419
- ISSN
1300-0101
- Publication type
Article