Formation of Anodic Oxide Nanotubes in H₂O₂ - Fluoride Ethylene Glycol Electrolyte as Template for Electrodeposition of α-Fe₂O₃

Abstract:

Anodic oxidation of titanium (Ti), zirconium (Zr) and niobium (Nb) foils in fluoride ethylene glycol (EG) added to it 1 H₂O₂ as oxidant was done to produce oxide film with nanostructures at 40 V. Whilst arrays of aligned nanotubes were successfully formed on the surface of Ti and Zr respectively, anodic Nb₂O₅ was found to consist of nanoporous structure with pore size of ~ 20 nm. Despite long nanotubes were formed on both Ti (2 μm) and Zr (3 μm), the surface of the nanotubes suffered from severe dissolution, thinning the wall and collapsing them. Well defined, ordered surface structure of the nanotubes is required as they will be used as template for subsequent deposition of nanoparticles. This was achieved when Ti anodised in 5 ml H₂O₂ fluoride EG. With excess H₂O₂ etching at the surface occur more uniformly forming homogenous surface structure. α-Fe₂O₃ were then electrodeposited on this surface at-3 V from chloride solution and the mode of formation is believed to be due to electrogeneration of base at the surface of the TiO₂.

• Periodical: Advanced Materials Research (Volume 832)
• Pages: 333-337
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.832.333
• Online since: November 2013
• Authors: Zainovia Lockman, Dede Miftahul Anwar, Monna Rozana, Syahriza Ismail, Ehsan Ahmadi, Abdul Razak Khairunisak, Kuan Yew Cheong
• Keywords: Anodisation, Electrodeposition, Fe₂O₃, TiO₂, Zro₂

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