Abstract

Thin amorphous nanostructured Pt films have been photochemically obtained by means of direct UV radiation (254 nm) of an amorphous Pt[CH3(CH2)8COCHCOC4H9] 3K film deposited on Si(100) and on ITO glass through the spin-coating technique. The product of this photolysis was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and microanalysis. After that, the film was subject to cycles for 1 h, between -0.30 and 1.20 V, in a 0.50 M H2SO4 electrolytic solution. It may be observed that the peak potential shifts in approximately 0.04 V towards less positive values for the modified system, if compared with the platinum bulk. It only showed one peak in the hydrogen discharge if compared with the two peaks in the Pt bulk. Based on these data, the ITO/Pt modified system was tested as an electrodic substrate for aniline polymerization in 0.50 M H2SO4. The polymeric deposit was obtained at lower potentials than those required when the Pt bulk is used as an electrode. © 2002 Elsevier Science B.V. All rights reserved.