resumo
Electrochemical deposition of Pb and Te into barrierless nanoporous aluminium oxide films on Ti substrates was studied. Porous anodic alumina on Ti was prepared by two-step anodization in oxalic acid of Al layer sputtered on Ti. The barrier layer was eliminated by the controllable acidic treatment of anodized samples. The effectiveness of the barrier layer dissolution was studied electrochemically using lead deposition-oxidation test reaction. Electrodeposition of Te into porous anodic alumina films was found to proceed with overvoltage related both to nucleation barrier and diffusion limitation in the pores. Lead underpotential deposition on Te particles electrodeposited in anodic alumina films was considered. It is characterized by high irreversibility due to the effective chemical interaction between Te nanoparticles and lead adatoms resulting in PbTe nanoparticles formation. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
palavras-chave
HIGH-ASPECT-RATIO; NANOWIRE ARRAYS; PULSED ELECTRODEPOSITION; AAO TEMPLATE; FABRICATION; SUBSTRATE; DISSOLUTION; GROWTH; TE
categoria
Electrochemistry
autores
Ivanou, DK; Ivanova, YA; Lisenkov, AD; Zheludkevich, ML; Streltsov, EA
nossos autores
Aleksey Lisenkov
Investigador Júnior
Mikhail Zheludkevich
Investigador Principal Convidado
Yuliya Ivanova
Bolseiro de pós-Doutoramentoagradecimentos
The financial support of Belarusian Foundation for Basic Research (project X09M-065) and Portuguese Foundation for Science and Technology in frame of REDE/1509/RME/2005 project is gratefully acknowledged.