| Autor: |
Cioffi, N., Losito, I., Torsi, L., Farella, I., Valentini, A., Sabbatini, L., Zambonin, P. G., Bleve-Zacheo, T. |
| Zdroj: |
Chemistry of Materials; February 2002, Vol. 14 Issue: 2 p804-811, 8p |
| Abstrakt: |
A systematic spectroscopic and morphological characterization of gold−fluoropolymer (CFx(Au)) nanocomposites, deposited by ion beam cosputtering, is presented. These composites are technologically relevant, since they exhibit vapor-sensing properties based on swelling phenomena. Analysis by X-ray photoelectron spectroscopy (XPS) allows us to assess that gold codeposition induces a progressive defluorination of the polymeric chains, leading to a significant increase of the polymer chains' branching and of the concentration of unsaturated fluorinated carbons. The presence of a fluoride peak in the F 1s spectrum proves the formation of polar gold fluorides. Transmission electron microscopy reveals the presence of in-plane homogeneously distributed nanosized gold domains, while angle-resolved X-ray photoelectron spectroscopy indicates a nonhomogeneous in-depth distribution of the gold particles, with the outer surface being less rich in nanoparticles. Results derived from the analytical characterization allow a deeper understanding of the swelling phenomena involved in the sensing processes. |
| Databáze: |
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