Interaction of H2O, O2 and CO2 with the surface of polyphenylacetylene films: an XPS investigation
1991; Elsevier BV; Volume: 185; Issue: 1-2 Linguagem: Inglês
10.1016/0009-2614(91)80148-q
ISSN1873-4448
AutoresG. Polzonetti, Michele Russo, A. Furlani, Giovanna Iucci,
Tópico(s)Transition Metal Oxide Nanomaterials
ResumoAbstract The interaction of small molecules (H 2 O, O 2 and CO 2 ) with polyphenylacetylene (PPA) thin films has been studied. The air-exposed PPA interacts with the atmosphere water vapour, leading to covalently bonded OH groups on the basis of X-ray photoelectron spectroscopy (XPS) core-level spectra of C 1s and O 1s. The surface-depth layer involved in the reaction is about 15 A, as determined by Ar ion-sputtering measurements. The ion sputtering allows one also to obtain an oxygen-free PPA surface which in turn is exposed to H 2 O, O 2 and CO 2 . The required gas pressure, in order to reach a detectable interaction, is ⩾ 760 Torr. Water vapour undergoes a dissociation reaction which gives OH moieties bonded to the polymer carbon atoms. O 2 is only physisorbed at the PPA surface, while CO 2 gives a chemical reaction which leads to the formation of weakly bonded CO groups.
Referência(s)