Session Y32: Novel Instrumentation & Techniques in Surface Science
8:00 AM–11:00 AM, Friday, March 19, 2010
Room: E142
Sponsoring Unit:
DMP
Chair: William Cullen, University of Maryland
Abstract ID: BAPS.2010.MAR.Y32.7
Abstract: Y32.00007 : Capturing the Crystalline Phase of Two-dimensional Nanocrystal Superlattices in Action
9:12 AM–9:24 AM
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Abstract 
Authors:
Zhang Jiang
(X-ray Science Division, Argonne National Laboratory)
Xiao-Min Lin
(Center for Nanoscale Materials, Argonne National Lab)
Michael Sprung
(X-ray Science Division, Argonne National Laboratory)
Suresh Narayanan
(X-ray Science Division, Argonne National Laboratory)
Jin Wang
(X-ray Science Division, Argonne National Laboratory)
Critical photonic, electronic, and magnetic applications of two-dimensional nanocrystal superlattices often require nanostructures in perfect single-crystal phases with long-range order and limited defects. Here we discovered a crystalline phase with quasi-long-range positional order for the two-dimensional nanocrystal superlattice domains self-assembled at the liquid-air interface during droplet evaporation, using in situ time-resolved x-ray scattering along with rigorous two-dimensional crystal theories. It was observed that drying these superlattice domains resulted in only orientational order but not long-range positional order, also supported by quantitative analysis of transmission electron microscopy images.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.Y32.7