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New Hybrid Films Based on Cellulose and Hydroxygallium Phthalocyanine. Synergetic Effects in the Structure and Properties
journal contribution
posted on 2007-03-27, 00:00 authored by Vicente Parra, Manuel Rei Vilar, Nicolas Battaglini, Ana M. Ferraria, Ana M. Botelho do Rego, Sami Boufi, María L. Rodríguez-Méndez, Egils Fonavs, Inta Muzikante, Marcel BouvetHydroxygallium phthalocyanine (HOGaPc) and cellulose (from a trimethylsilyl derivative) have been used as native
elements for the preparation of a novel family of hybrid films. By spin-coating, both components allow the building
of films with different configurations on various substrates in a controlled way. The particularities of these hybrid
films have been characterized by a range of techniques such as Fourier transform infrared spectroscopy (FTIRS) in
attenuated total reflection using multiple internal reflections (ATR/MIR), absorption ultraviolet and visible spectroscopy
(UV−vis), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and surface potential measurements
using the Kelvin−Zisman vibrating capacitor probe (KP). This enabled determination of the influence of cellulose
on the arrangement of HOGaPc and, consequently, control of the relation between the structure and the properties
of the films. Finally, gas sensor tests were performed to check the potentialities of these hybrid films. In particular,
the synergetic behavior between the film-forming materials allows a fast and sensible change in surface potential after
cyclic exposures to ozone (O3, 100 ppb) and nitrogen. Overall, we present the advantages of combining phthalocyanine
with cellulose in enhancing the properties of the final product. Introduction of cellulose as a host material opens up
a new area of hybrid films.