Dispersion and microwave processing of nano-sized ITO powder for the fabrication of transparent conductive oxides

S. Ghanizadeh, T. A. Nirmal Peiris, D. S.Y. Jayathilake, D. A. Hutt, K. G. U. Wijayantha, D. J. Southee, P. P. Conway, P. Marchand, J. A. Darr, I. P. Parkin, C. J. Carmalt

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Abstract

Aqueous dispersions of tin-doped indium oxide (ITO) nanopowder were prepared and the effect of the addition of PEG 400, Tween 80 and β-alanine as dispersants was investigated using zeta potential and particle size distribution measurements. Both PEG 400 and β-alanine were found to produce stable dispersions that were used to deposit ITO thin films on glass substrates by dip and spin coating methods. The ITO thin films were heat-treated using both conventional and microwave heat treatment in order to improve the inter-particle connections and hence the resistivity and transparency of the films. All the films exhibited an average transmittance of >80% over the visible spectrum after being subjected to the heat treatment process. ITO films prepared with no dispersant showed very high resistivity values for both heating methods, however addition of 2 wt% PEG 400 to the dispersion yielded a reduction in the resistivity values to 1.4×10−1 Ω cm and 3.8×10−2 Ω cm for conventionally and microwave treated films, respectively. The surface morphological studies confirmed that addition of dispersants improved the film uniformity and inter-particle connections of the ITO films considerably.

Original languageEnglish
Pages (from-to)18296-18302
Number of pages7
JournalCeramics International
Volume42
Issue number16
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Keywords

  • Dispersants/Dispersion
  • Indium/Indium compounds
  • Nanoparticles
  • Thin films
  • Transparent conducting oxides

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