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 is 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.

Analysis of the surface chemical composition and morphological structure of vapor sensing gold-fluoropolymer nanocomposites

CIOFFI, NICOLA;LOSITO, Ilario;TORSI, Luisa;VALENTINI, Antonio;SABBATINI, Luigia;
2002

Abstract

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 is 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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/124267
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 35
  • ???jsp.display-item.citation.isi??? 35
social impact