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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Fabrication and electrochemical application of three-dimensional gold nanoparticles: Self-assembly
Journal of Physical Chemistry B, Volume 110, No. 6, Year 2006
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Description
Multilayers film of nanostructured citrate-stabilized gold particles (AuNPs) has been fabricated based on the layer-by-layer (LBL) technique using a self-assembled monolayer of 1,4-benzenedimethanethiol (BDMT). The formation of AuNPs and BDMT self-assemblies as alternative multilayers was confirmed by transmission electron microscopy (TEM), X-ray photoelectron spectroscope (XPS), and quartz crystal microbalance (QCM). The formation of uniform AuNP layers with an average monolayer thickness of 5-6 nm was obvious in the TEM images. The existence of BDMT molecules as cross linkers for the AuNPs' layers was proved by XPS measurements. The greater affinity of AuNPs' layers to bind BDMT molecules in comparison with the bare Au bulk electrode was revealed by QCM measurements. Electrochemically, the AuNPs' layers on the electrode surface did not only catalyze the reduction of oxygen (ca. 100-mV positive shift of the reduction peak potential compared with that at the bare Au bulk electrode) but also showed a fascinating nature of working as a renewed activated-electrode surface; a zigzag response was observed for oxygen reduction during alternative immobilization of BDMT and the AuNP layer. The self-assembly of a new AuNPs layer restored the catalytic activity that was entirely blocked by the preceding BDMT layer. © 2006 American Chemical Society.
Authors & Co-Authors
Abdelrahman, Ahmed I.
Japan, Tokyo
Tokyo Institute of Technology
Mohammad, Ahmad M.
Egypt, Giza
Faculty of Science
Okajima, Takeyoshi
Japan, Tokyo
Tokyo Institute of Technology
Ohsaka, Takeo
Japan, Tokyo
Tokyo Institute of Technology
Statistics
Citations: 69
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1021/jp056238x
ISSN:
15206106