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Characterization of nano-organized multilayers constituted by successive inorganic (gold) and organic (alkylthiols) layers
- Source :
- Surface and Interface Analysis. 39:691-697
- Publication Year :
- 2007
- Publisher :
- Wiley, 2007.
-
Abstract
- Nanostructured multilayers constituted by alternate metallic (gold) and organic (alkyldithiol) layers, and grafted onto glass or silicon substrates are prepared and analysed. Such complex layers could be of interest as a new type of surfaces but also as localized dissipative zones particularly in the field of adhesion science. The formation and the structure of these model systems are examined using a number of techniques such as atomic force microscopy (AFM), wetting analysis (contact angles), X-ray photoelectron spectroscopy (XPS) and conductivity measurements. It is shown that, in terms of electrical conductivity, gold layers exhibit a percolation transition from an insulating granular structure to a conductive worm-like structure at a threshold thickness of about 5 nm. XPS (and wettability) analyses clearly indicate that the fractional coverage of the gold surface is about 30% with alkyldithiol and that these molecules are either grafted in a stand-up position or in the form of a loop. Moreover, a partial electrical connection between two successive gold layers is observed, confirming that the confined organic layer of alkyldithiol between them is too loosely organized to play the role of an insulating barrier. Copyright (C) 2007 John Wiley & Sons, Ltd.
- Subjects :
- Silicon
Analytical chemistry
chemistry.chemical_element
Surfaces and Interfaces
General Chemistry
Conductivity
Condensed Matter Physics
Surfaces, Coatings and Films
Contact angle
Metal
chemistry
X-ray photoelectron spectroscopy
Chemical engineering
Percolation
visual_art
Nano
Materials Chemistry
visual_art.visual_art_medium
Wetting
Subjects
Details
- ISSN :
- 10969918 and 01422421
- Volume :
- 39
- Database :
- OpenAIRE
- Journal :
- Surface and Interface Analysis
- Accession number :
- edsair.doi...........33d3b947b6d739bd5e3154191c9f48e6