Scanning tunneling microscopy investigations of cadmium stearate bilayers and dipalmitoyl phosphotidylcholine monolayers on graphite

Jorma A. Virtanen; Samuel Lee; Sinikka A. Virtanen; Reginald M. Penner

doi:10.1117/12.58178

1 May 1992 Scanning tunneling microscopy investigations of cadmium stearate bilayers and dipalmitoyl phosphotidylcholine monolayers on graphite

Jorma A. Virtanen, Samuel Lee, Sinikka A. Virtanen, Reginald M. Penner

Author Affiliations +

Proceedings Volume 1639, Scanning Probe Microscopies; (1992) https://doi.org/10.1117/12.58178
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

Bilayers of cadmium stearate (Cd-stearate) and monolayers of dipalmitoyl phosphatidylcholine (DPPC) have been assembled on highly oriented pyrolytic graphite (HOPG) substrates and investigated in air using the scanning tunneling microscope (STM). STM images of Cd- stearate bilayers reveal a regular two-dimensional lattice of high tunneling current vertices which are separated by 4 - 6 angstroms. Few defects are observed in these lattices. 'High (tau) ' bilayers, which were deposited with a transfer ratio, (tau) approximately equals 2.0, have monoclinic lattices whereas the lattices of 'low (tau) ' bilayers, with (tau) equals 1.4 - 1.6, are orthorhombic. Molecular resolution STM data is also presented for DPPC monolayers prepared by the conventional Langmuir-Blodgett vertical deposition method. In monolayers of these structurally more complex amphiphiles, greater disorder is evident. Prolonged STM scanning of either Cd-stearate bilayers or DPPC monolayers induces modification of the 'native' crystalline structure presumably due to tip-film interactions.

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Jorma A. Virtanen, Samuel Lee, Sinikka A. Virtanen, and Reginald M. Penner "Scanning tunneling microscopy investigations of cadmium stearate bilayers and dipalmitoyl phosphotidylcholine monolayers on graphite", Proc. SPIE 1639, Scanning Probe Microscopies, (1 May 1992); https://doi.org/10.1117/12.58178

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