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Science 5 February 1993:
Vol. 259. no. 5096, pp. 798 - 801
DOI: 10.1126/science.259.5096.798
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Articles

Molecular Positional Order in Langmuir-Blodgett Films by Atomic Force Microscopy

L. Bourdieu 1, O. Ronsin 1, and D. Chatenay 1

1 Institut Curie, Section de Physique et Chimie, Laboratoire de Physico-Chimie des Surfaces et Interfaces, Unité Associée CNRS 1379, 11 rue Pierre et Marie Curie, 75005 Paris, France

Langmuir-Blodgett films of barium arachidate have been studied on both macroscopic and microscopic scales by atomic force microscopy. As prepared, the films exhibit a disordered hexagonal structure; molecularly resolved images in direct space establish a connection between the extent of the positional order and the presence of defects such as dislocations. Upon heating, the films reorganize into a more condensed state with a centered rectangular crystallographic arrangement; in this new state the films exhibit long-range positional order and unusual structural features, such as a height modulation of the arachidic acid molecules.

Submitted on September 25, 1992
Accepted on November 30, 1992


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Science. ISSN 0036-8075 (print), 1095-9203 (online)