Mechanisms for species-selective oriented crystal growth at organic templates

Sumit Kewalramani, Kyungil Kim, Guennadi Evmenenko, Paul Zschack, Evguenia Karapetrova, Jianming Bai, Pulak Dutta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Langmuir monolayers floating on supersaturated aqueous subphases can act as templates for the growth of oriented inorganic films - a "bioinspired" nucleation process. We have performed in situ grazing incidence x-ray diffraction studies of the selective nucleation of BaClF and BaF2 under fatty acid monolayers. The arrangement of the fatty acid headgroups, the monolayer charge, and ion-specific effects all play important roles in selecting the inorganic species. When the monolayer is in a neutral state, both BaClF and BaF2 nucleate at the interface and are well aligned, but when the monolayer headgroup is deprotonated, only oriented BaF2 grows at the interface. We also observe an enhanced alignment of BaF2 crystals during growth from highly supersaturated solutions, presumably due to reorganization of preformed crystals at the organic template. These results show that a delicate interplay between multiple factors governs the oriented growth of inorganic films at organic templates.

Original languageEnglish (US)
Pages (from-to)2785-2790
Number of pages6
JournalJournal of Materials Research
Volume22
Issue number10
DOIs
StatePublished - Oct 1 2007

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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