Probing anodic oxidation kinetics and nanoscale heterogeneity within TiO2 films by Conductive Atomic Force Microscopy and combined techniques

M. V. Diamanti, T. Souier, M. Stefancich, M. Chiesa, M. P. Pedeferri

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Anodic oxidation of titanium in acid electrolytes allows to obtain a thin, compact oxide layer with thickness, structure, color, and electrical properties that vary with process parameters imposed, among which cell voltage has a key effect. Although oxidation kinetics have been investigated in several research works, a broader vision of oxide properties-including thickness and structure-still has to be achieved, especially in the case of very thin oxide films, few tens of nanometers thick. This is vital for engineered applications of nanostructured TiO2 films, as in the field of memristive devices, where a precise control of oxide thickness, composition and structure is required to tune its electrical response. In this work, oxide films were produced on titanium with thickness ranging from few nanometers to 200 nm. Oxide thickness was estimated by coulometry and spectrophotometry. These techniques were then combined with C-AFM, which provided a deeper understanding of oxide thickness and uniformity of the metal surface and probed the presence of crystalline nano-domains within the amorphous oxide phase affecting the overall film electrical and optical properties.

Original languageEnglish
Pages (from-to)203-210
Number of pages8
JournalElectrochimica Acta
Volume129
DOIs
Publication statusPublished - May 20 2014

Keywords

  • anodizing
  • conductivity
  • memristor
  • nanoscale
  • titanium oxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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