The role of oleic acid: From synthesis to assembly of perovskite nanocuboid two-dimensional arrays

Linhua Hu, Chuandao Wang, Robert M. Kennedy, Laurence D. Marks, Kenneth R. Poeppelmeier

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Oleic acid, an 18-carbon chain fatty acid, has been widely used as a surfactant to fabricate colloidal nanocrystals. In previous work, we discovered a lamellar microemulsion strategy to fabricate sub-20 nm SrTiO3 nanocuboids using oleic acid and oleate species. Here, we demonstrate (i) the general synthesis with lamellar microemulsions of a family of compositionally varied BaxSr1-xTiO3 crystalline nanocuboids with uniform size, and (ii) subsequent assembly into two-dimensional arrays by nanoparticle-bound oleate in a nonpolar solvent. The measured interparticle distance (2.4 nm) of adjacent nanoparticles in an array is less than the length of a double oleate layer (∼4 nm). On the basis of calculations of the interfacial free energy, we propose the hydrophobic, hydrocarbon-terminated groups of oleate from adjacent nanocuboids are situated closely but do not overlap. Lower aspect ratio nanocuboids are bordered by four adjacent nanocuboids which results in a uniform direction self-assembly array, whereas higher aspect ratio nanocuboids are bordered by five or six adjacent nanocuboids and can develop an arced local coordination.

Original languageEnglish
Pages (from-to)740-745
Number of pages6
JournalInorganic Chemistry
Volume54
Issue number3
DOIs
Publication statusPublished - Feb 2 2015

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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