In Situ Intercalation/Polymerization of Melanin into Vanadium Pentoxide
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Mat. Res. Soc. Symp. Proc. Vol. 576 ©1999 Materials Research Society
polymerized V 20 5 .nH 20 gel was formed by a spontaneously polycondensation at room temperature [5]. The compound was prepared by the direct reaction of 4.0 mL of 5.0 mM aqueous solution of DL-DOPA (C9H11N0 4), dissolved into water purified by a Millipore Milli-Q System, with 20.0 mL of the V2 0 5 .nH 20 gel. The reaction was carried out at room temperature (24TC), stirred during 4 h in air, resulting a dark green suspension. From this suspension, the compound was obtained by the slow evaporation on a substrate (glass plate) at room temperature and in air, leading to a metallic dark blue film, and, after, rinsed with nanopure water and dried again. Finally, the samples in film form were carefully removed from the glass plate and then stored in vaccum. The material has the follow formula (melanin)0. 2 V2 0 5 .0.5H 20, evaluated by thermal analysis. Experimental Details The X-ray diffraction data were recorded on a SIEMENS D5005 diffiractometer using a graphite monochromator and CuKa emission lines (1.541 A, 40 kV, 40 mA). The samples, in film form, were mounted on a glass plate and the data were collected at room temperature over the range 20 < 20 _
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