X-ray photoelectron spectroscopy was used in order to investigate the interface formation between chromium and thin films of a newly synthesised pi-conjugated polymer P(PA-pNO(2)PA); the investigated material is a block copolymer consisting of phenylacetylene (PA) and para-nitro phenylacetylene (pNO(2)PA) units {[-(CH=C-R)(n)-(CH=C-R')(m)-](N); R = C6H5, R' = C6H4NO2}. Chromium was evaporated stepwise in situ onto the polymer surface and the XPS spectra of the substrate polymer and of the metal overlayer were studied as a function of increasing chromium thickness. In the early stages of the interface formation, chromium was found to interact mainly with the nitrogen atoms of the -NO2 groups, that are reduced to nitride-like species; the N-O bond is broken, as evidenced by the modifications occurring in the N1s and O1s spectra. The changes in the C1s spectra upon increasing metal deposition suggest the formation of a chromium-arene pi-complex at low chromium coverage and of carbide-like species at higher chromium thickness.

Iucci, G., Polzonetti, G., Altamura, P., Russo, M.v., Paolucci, G., Goldoni, A., et al. (1999). Reactivity of the nitro-group of a -conjugated polymer upon the interface formation with chromium: a photoelectron spectroscopy investigation. APPLIED SURFACE SCIENCE, 153, 10-18 [10.1016/S0169-4332(99)00333-5].

Reactivity of the nitro-group of a -conjugated polymer upon the interface formation with chromium: a photoelectron spectroscopy investigation

IUCCI, GIOVANNA;
1999-01-01

Abstract

X-ray photoelectron spectroscopy was used in order to investigate the interface formation between chromium and thin films of a newly synthesised pi-conjugated polymer P(PA-pNO(2)PA); the investigated material is a block copolymer consisting of phenylacetylene (PA) and para-nitro phenylacetylene (pNO(2)PA) units {[-(CH=C-R)(n)-(CH=C-R')(m)-](N); R = C6H5, R' = C6H4NO2}. Chromium was evaporated stepwise in situ onto the polymer surface and the XPS spectra of the substrate polymer and of the metal overlayer were studied as a function of increasing chromium thickness. In the early stages of the interface formation, chromium was found to interact mainly with the nitrogen atoms of the -NO2 groups, that are reduced to nitride-like species; the N-O bond is broken, as evidenced by the modifications occurring in the N1s and O1s spectra. The changes in the C1s spectra upon increasing metal deposition suggest the formation of a chromium-arene pi-complex at low chromium coverage and of carbide-like species at higher chromium thickness.
1999
Iucci, G., Polzonetti, G., Altamura, P., Russo, M.v., Paolucci, G., Goldoni, A., et al. (1999). Reactivity of the nitro-group of a -conjugated polymer upon the interface formation with chromium: a photoelectron spectroscopy investigation. APPLIED SURFACE SCIENCE, 153, 10-18 [10.1016/S0169-4332(99)00333-5].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/118995
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