Nano Archive

Charge transfer across self-assembled nanoscale metal-insulator-metal heterostructures

Zhao, Jianjun and Wasem, Matthias and Bradbury, Christopher R. and Fermin, David J. (2008) Charge transfer across self-assembled nanoscale metal-insulator-metal heterostructures. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (18). pp. 7284-7289.

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The kinetics of charge transfer across a metal-insulator-metal architecture is investigated by electrochemical impedance spectroscopy. The insulating component of the architecture is composed by a self-assembled monolayer of 11-mercaptoundecanoic acid (MUA), polyelectrolyte multilayers, and a monolayer of 22 nm SiO2 nanoparticles. The charge transfer to the hexacyanoferrate couple is strongly hindered by the MUA monolayer. The blocking properties effectively vanish with the adsorption of a diluted monolayer of Au nanoparticles (19 nm). Atomic force microscopy and scanning electron microscopy analyses demonstrate that the Au nanoparticles are physically separated from the Au surface by the SiO2 monolayer. The strong electronic communication between the metal nanoparticles and the electrode is rationalized by a nonthermalized transport process involving redox species trapped in the multilayer assembly.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Physical Science > Nanophysics
Material Science > Nanostructured materials
ID Code:2394
Deposited By:Anuj Seth
Deposited On:17 Dec 2008 12:17
Last Modified:17 Dec 2008 12:17

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