Synthetic Metals, 41--43 (1991) 77 77 DETERMINATION OF THE MORPHOLOGY OF CONDUCTING POLYMERS WITH SCANNING TUNNELING MICROSCOPY AND ATOMIC FORCE MICROSCOPY K.-G. Loh, R. J. D. Miller,H. A. Mizes and E. M Conwell NSF Science and Technology Center, Department ofChemistry University of Rochester, Rochester,NY, 14627 USA and N. Theophilou and A. G. MacDiarrnid Department of Chemistry, University ofPennsylvania Philadelphia, PA, 19104 USA and G. Arbuckle Department ofChemistry, Rutgers University Carndcn,NJ,08102 USA Charge transport in conducting polymers depends not only on the intrinsic feature ofthe polymer chains, but alsoon three-dimensional features,such as interchain coupling, dopant inhomogeneities, and fibril structure. The scanning tunneling microscope and the atomic forcemicroscope can be used to study these and other effectsfor conducting polymers in both theirdoped and undoped states. In particular,for polyacetylene we have resolved the 500 angstrom fibrils of the Naarman-Theophilou (N-T) polyacetylene and the 100 angstrom fibrils of thin films of Shirakawa polyacetylene. Upon doping, the N-Tpolyacetylene shows bumps with a typical area of 0.2 square microns, which may be attributed to inhomogeneous doping. The fibrils of the Shirakawa films are seen to have fiatterraces. We have observed periodic structure on a terrace which may be due to eitherdopant arrangment in the fibril or to localchain deformations. Elsevier Sequoia/Printed in The Netherlands

Determination of the morphology of conducting polymers with scanning tunneling microscopy and atomic force microscopy

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Synthetic Metals, 41--43 (1991) 77 77

DETERMINATION OF THE MORPHOLOGY OF CONDUCTING POLYMERS WITH SCANNING TUNNELING MICROSCOPY AND ATOMIC FORCE MICROSCOPY

K.-G. Loh, R. J. D. Miller, H. A. Mizes and E. M Conwell NSF Science and Technology Center, Department of Chemistry University of Rochester, Rochester, NY, 14627 USA and N. Theophilou and A. G. MacDiarrnid Department of Chemistry, University of Pennsylvania Philadelphia, PA, 19104 USA and G. Arbuckle Department of Chemistry, Rutgers University Carndcn,NJ,08102 USA

Charge transport in conducting polymers depends not only on the intrinsic feature of the polymer chains, but also on three-dimensional features, such as interchain coupling, dopant inhomogeneities, and fibril structure. The scanning tunneling microscope and the atomic force microscope can be used to study these and other effects for conducting polymers in both their doped and undoped states. In particular, for polyacetylene we have resolved the 500 angstrom fibrils of the Naarman-Theophilou (N-T) polyacetylene and the 100 angstrom fibrils of thin films of Shirakawa polyacetylene. Upon doping, the N-Tpolyacetylene shows bumps with a typical area of 0.2 square microns, which may be attributed to inhomogeneous doping. The fibrils of the Shirakawa films are seen to have fiat terraces. We have observed periodic structure on a terrace which may be due to either dopant arrangment in the fibril or to local chain deformations.

Elsevier Sequoia/Printed in The Netherlands