Atomic Force Microscopy of the Electrochemical Nucleation and Growth of Molecular Crystals
Rept. for 1 May 93-30 Jun 94,
MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE
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The atomic force microscope AFM was employed to examine the nanoscale morphology, surface topography, and growth and dissolution characteristics of single crystals of a series of organic charge transfer salts, specifically those comprising the tetracyanoquinodimethane TCNQ acceptor and tetrathiafulvalene TTF, tetramethyltetraselenafulvalene TMTSF, and bis- ethylenedithiolotetrathiafulvalene BEDT-TTF donors. The dynamics of electrocrystallization were studied in situ on specific exposed crystal faces of these salts while the supersaturation was controlled by the applied electrochemical potential. Results indicate that the growth modes and the distribution and orientation of topographic features can be correlated with the strength and direction of solid state intermolecular bonding. In general, the nanoscale topographic structure resembled the macroscopic morphology, suggesting self-similarity across the length scales examined.
- Organic Chemistry
- Electricity and Magnetism