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Authors Voigt, I. ; Simon, ; Esthel, K. ; Spange, St. ; Friedrich, K.
Title Fabrication and Characterization of Fullerene Functionalized Poly(vinyl formamide-co-vinyl amine)/Inorganic Oxidic Hybrid Particles
Date 25.12.2001
Number 8766
Abstract The postfunctionalization of polyelectrolyte (PE) poly(vinyl formamide-<I>co</I>-vinylamine) (PVFA-<I>co</I>-PVAm)layers adsorbed on silica or titanium dioxide particles with fullerene (C<SUB>60</SUB>) has been investigated. Thefunctionalization process requires two steps, the adsorption of the (PVFA-<I>co</I>-PVAm) from an aqueoussolution onto the inorganic particles (silica or titanium dioxide) and the reaction of the PE-modified particleswith C<SUB>60</SUB> in toluene. By means of this procedure the PVFA-<I>co</I>-PVAm layer on the particle surface is irreversiblyfixed by the reaction between the accessible primary amino groups of the PE and fullerene (C<SUB>60</SUB>). The degreeof conversion of PVFA-<I>co</I>-PVAm/silica with C<SUB>60</SUB> has been investigated by UV-vis spectroscopy andquantitative electron paramagnetic resonance spectroscopy. The fixing of only a small amount of fullereneon the PVFA-<I>co</I>-PVAm layer strongly influences the Br<IMG SRC="/images/entities/oslash.gif">nsted acid-base behavior and the surface chargedensity of the whole particles as shown by electrokinetic measurements. Atomic force microscopicinvestigations on smooth PVFA-<I>co</I>-PVAm/silicon substrates before and after C<SUB>60</SUB> functionalization showthat C<SUB>60</SUB> molecules form aggregates within the PE layer. Furthermore, the <I>E</I><SUB>T</SUB>(30)<br /> polarity parameters ofthe C<SUB>60</SUB>-functionalized PVFA-<I>co</I>-PVAm layers on silica are investigated by various substituted Reichardtsdyes.
Publisher Langmuir
Wikidata
Citation Langmuir 17 (2001) 8355-8361
DOI https://doi.org/10.1021/la010924f
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