交互蒸着法による金属-酸化バナジウム系薄膜の作製とそのエレクトロクロミズム

概要

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Metal (Au, Ag, Cu) V_2O_5 thin films were prepared by means of an alternating thermal deposition technique and tested for physical and electrochromic properties. XRD analysis and TEM observation revealed that in the Au V_2O_5 films ultrafine Au particles are well dis persed in the V_2O_5 matrix, while complex metal vanadi um oxides seemed to form in Ag V_2O_5 and Cu V_2O_5 films. In accordance with these results, only the Au V_2O_5 films showed strong optical absorption at around 600 nm ascribable to the Au particles and gave new clear electrochromism of green (anodic) reddish vio let (cathodic) , in ontrast to the dull electrochromism of orange bluish green or orange brown of the other systems. Unlike the other systems, the Au V_2O_5 system exhibited essentially the same cyclic voltammo grams as those of a pure V_2O_5 film, indicating that the new coloration involves the plasmon resonance absorp tion of the Au particles. The clearest reddish violet coloration on the cathodic polarization was obtained with the Au V_2O_5 film which had 20 30 at% Au and was calcined at 400℃. On the basis of the Maxwell Gar nett theory, the reddish color seems to result from a change in the effective dielectric constant of dispersed Au particles, as was proposed in the Au WO_3 system.
社団法人日本セラミックス協会の論文
1994-06-01