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Chromic Polydiacetylene Single Crystals: Atomic Force Microscopy Studies

Published online by Cambridge University Press:  10 February 2011

V. Shivshankar,
C. Sung,
J. Kumar,
S. K. Tripathy and
D. J. Sandman
V. Shivshankar
Affiliation:
Center for Advanced Materials, Departments of Chemistry
C. Sung
Affiliation:
Chemical and Nuclear Engineering
J. Kumar
Affiliation:
Physics and Applied Physics, University of Massachusetts-Lowell, Lowell, Massachusetts 01854, USA.
S. K. Tripathy
Affiliation:
Center for Advanced Materials, Departments of Chemistry
D. J. Sandman
Affiliation:
Center for Advanced Materials, Departments of Chemistry
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Abstract

We have studied the surface morphology of free standing single crystals of thermochromic polydiacetylenes (PDAs), namely, ETCD and IPUDO (respectively, the ethyl and isopropyl urethanes of 5,7-dodecadiyn-1,12-diol), by Atomic Force Microscopy (AFM) under ambient conditions. Micron scale as well as molecularly resolved images were obtained. The micron scale images indicate a variable surface, and the molecularly resolved images show a well defined 2-D lattice that is interpreted in terms of molecular models and known crystallographic data. Thereby information about surface morphology, which is crucial to potential optical device or chromic sensor performance is available. We also report the observation of a “macroscopic shattering” of the IPUDO monomer crystal during in-situ UV polymerization studies.

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References

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