Surface vibrational spectroscopy on shear-aligned poly(tetrafluoroethylene) films.
Sum-frequency vibrational spectroscopy was used to obtain the first surface vibrational spectra of shear-deposited highly oriented poly(tetrafluoroethylene) (PTFE, Teflon) thin films. The surface PTFE chains appeared to lie along the shearing direction. Vibrational modes observed at 1142 and 1204 cm-1 were found to have the E1 symmetry, in support of some earlier analysis in the long-lasting controversy over the assignment of these modes.
Ji
Na
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Department of Physics, University of California at Berkeley, and Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Ostroverkhov
Victor
V
Lagugné-Labarthet
François
F
Shen
Yuen-Ron
YR