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 journalArticle

17 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

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oleic acid
Oleic Acid
assembly
synthesis
low aspect ratio
nanoparticles
Microemulsions
fatty acids
high aspect ratio
self assembly
Aspect ratio
nanocrystals
hydrocarbons
free energy
surfactants
Nanoparticles
carbon
Hydrocarbons
Surface-Active Agents
Nanocrystals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

The role of oleic acid : From synthesis to assembly of perovskite nanocuboid two-dimensional arrays. / Hu, Linhua; Wang, Chuandao; Kennedy, Robert M.; Marks, Laurence D.; Poeppelmeier, Kenneth R.

In: Inorganic Chemistry, Vol. 54, No. 3, 02.02.2015, p. 740-745.

Research output: Contribution to journalArticle

Hu, Linhua ; Wang, Chuandao ; Kennedy, Robert M. ; Marks, Laurence D. ; Poeppelmeier, Kenneth R. / The role of oleic acid : From synthesis to assembly of perovskite nanocuboid two-dimensional arrays. In: Inorganic Chemistry. 2015 ; Vol. 54, No. 3. pp. 740-745.
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