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Type: Artigo de periódico
Title: Sensitization of niobium pentoxide thin films by cis-dithiocyanate (2,2-bipyridyl-4,4 ' dicarboxylic acid) ruthenium(II) complex
Author: Barros, DD
Abreu, PP
Alves, OL
Franco, DW
Abstract: The sensitization caused by the adsorption of a ruthenium complex in a niobium thin film (d < 300 nm) was analysed by photoelectrochemical measurements. The films were coated on a indium-tin-oxide (ITO) conductor glass by a dip-coating technique. The non-sensitized him had only photoelectrochemical current in the UV region (i <less than or equal to> 40 nA). The sensitization of the film by cis-dithiocyanate (2,2-bipyridyl-4,4'dicarboxylic acid) ruthenium(II) complex altered the shape of the non-normalized action spectrum with the presence of photoelectrochemical current in the visible range (lambda greater than or equal to 400 nm). This photoelectrochemical current (i less than or equal to 70 nA) was associated with electron injection into the niobium pentoxide conduction band due to metal-to-ligand charge-transfer (MLCT) of the ruthenium complex. The shape of the action spectrum in the UV range (lambda less than or equal to 400 nm) changed with the application of an electric potential to the film surface and the photoelectrochemical current associated with the ligand-to-metal charge transfer of niobia film decreased for higher ruthenium concentration.
Subject: sol-gel method
niobia films
ruthenium complex
charge injection
Country: Holanda
Editor: Kluwer Academic Publ
Rights: fechado
Identifier DOI: 10.1023/A:1008752124254
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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