Resumen

LONDONO-CALDERON, C. L.; JURADO, J. F.  y  VARGAS-HERNANDEZ, C.. Influencia del tiempo de gelificación sobre las propiedades estructurales, vibracionales y eléctricas del compósito PEG_0.2/V₂O₅. Superf. vacío [online]. 2012, vol.25, n.4, pp.203-208. ISSN 1665-3521.

Structural, vibrational and electrical properties of V₂O₅·nH₂O and PEG_0.2/V₂O₅ films as a function of gelation time were studied. The films were sintered by sol-gel using vanadium pentoxide route on glass substrates previously treated. Films were characterized by X-Ray Diffraction, Raman Spectroscopy and the four-point van der Pauw conventional method. The results indicated that when the gelation time of the precursor (V₂O₅·nH₂O) is increased, the crystalline quality, the degree of hydration, and V⁵⁺ ion concentration are increased. In the hybrid composite (PEG₀₂/V₂O₅), VO²+ ions act as bonding between the polymer chains, making them more compact to facilitate the mobility of electric charge carriers between vanadium ions. The results showed a semiconductor-metal transition about 34°C, an indirect optical transition (V₂O₅·nH₂O) and a vitreous transition around T_g=-69°C.

Palabras llave : PEG; V₂O₅·nH₂O; Hybrid Materials; Raman.

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