Self-assembly of TiO2 nanoparticles on native oxide terminated silicon surfaces

S. H. Al-Harthi, K. P. Revathy, A. K. George, M. E. Elzain, A. T. Al-Hinai, A. Mesli, N. V. Unnikrishnan

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2 Citations (Scopus)

Abstract

The TiO2 nanoparticle assemblies on native oxide terminated silicon substrates have been studied using Atomic Force Microscopy (AFM). The results lead to a consistent picture demonstrating the interplay between the coverage fraction of solvent and its thickness variation. Depending on this latter parameter, hole nucleation, multilayer-patterns, 3D structures, and nano-patterns ranging from isolated rings to cellular-like patterns were observed. Chemical potential as an explicit function of the remaining solvent coverage after initial solvent evaporation, potential gradient, capillary forces and surface instabilities driven by Laplace pressure are plausible factors to account for the observed patterns. The striking dependence of nanoparticles assembly on the layer thickness opens up a new parameter space in understanding the self-assembly mechanism of TiO2 nanoparticles.

Original languageEnglish
Pages (from-to)20-27
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume370
Issue number1-3
DOIs
Publication statusPublished - Nov 5 2010

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Keywords

  • Colloids
  • Dewetting
  • Interface
  • Nanomaterials
  • Surface
  • TiO

ASJC Scopus subject areas

  • Colloid and Surface Chemistry

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