Mechanisms for Species-Selective Oriented Crystal Growth at Organic Templates

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2007.0347· OSTI ID:959897

Kewalramani, S; Kim, K; Evmenenko, G; Zschack, P; Karapetrova, E; Bai, J; Dutta, P

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.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 959897
• Report Number(s): BNL--82883-2009-JA
• Journal Information: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 10 Vol. 22; ISSN JMREEE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALIGNMENT
CARBOXYLIC ACIDS
CRYSTAL GROWTH
CRYSTALS
FILMS
NUCLEATION
X-RAY DIFFRACTION
national synchrotron light source