Caracterização de filmes finos de Nb2O5 com propriedades eletrocrômicas

Química Nova

C. O. Avellaneda²  M. A. Aegerter¹  A. Pawlicka¹ 

[1] ,Universidade de São Paulo Instituto de Física de São Carlos Departamento de Física e Ciência dos MateriaisSão Carlos SP

关键词: sol-gel;    Nb2O5 films;    electrochromic properties;   

DOI  :  10.1590/S0100-40421998000300023

来源: SciELO

【 摘 要 】

The sols for thin electrochromic coatings of Nb2O5 were obtained by synthesis of the niobium butoxide from BuONa and NbCl5. The ~300nm thick films were deposited by dip-coating technique from the alkoxide solution and calcined at 560ºC in O2 atmosphere during 3 hours. The particles size of niobium oxide (V) powder (~20mm) was obtained from x-ray diffraction using the Scherrer equation. The coatings were characterized by cyclic voltammetry and cronoamperommetry techniques. The spectral variation of the optical transmittance were determined in situ as a function of the cyclical potencial and memory effect. The insertion process of lithium is reversible and change the film color from transparent (T=80%) to dark blue (T=20%).

【 授权许可】

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