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Structural and Morphological Characterization of Ultrathin Films of an Asymmetric Polydiacetylene

Published online by Cambridge University Press:  15 February 2011

H. C. Wang ,
D. W. Cheong ,
J. Kumar ,
C. Sung  and
S. K. Tripathy
H. C. Wang
Affiliation:
Department of Chemical Engineering Chemistry Lowell, MA 01854
D. W. Cheong
Affiliation:
Department of Chemical Engineering Chemistry Lowell, MA 01854
J. Kumar
Affiliation:
Department of Chemical Engineering and Physics, Lowell, MA 01854
C. Sung
Affiliation:
Center for Advanced Materials, University of Massachusetts-Lowell, Department of Chemical Engineering
S. K. Tripathy
Affiliation:
Department of Chemical Engineering Chemistry Lowell, MA 01854
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Abstract

A soluble, asymmetrically substituted polydiacetylene, poly(BPOD), has been reported to form stable monolayers at the air-water interface by the Langmuir-Blodgett (LB) technique [2]. Preformed polydiacetylene has been deposited onto hydrophobic substrates as multilayers to form second order nonlinear optical thin films. Second harmonic generation was found to increase with the number of layers. From previous atomic force microscopy (AFM) studies backbone orientation along the dipping direction with an interchain spacing of about 5 A° was indicated [2].The film morphology and preferential molecular orientation of these LB films are further investigated by transmission electron microscopy (TEM). A specifically tailored sample preparation method for the ultrathin LB films was used. Multilayer films were deposited on hydrophobic collodion covered glass substrates for this purpose. Electron diffraction was employed to study the crystalline organization of mono and multilayers of LB films as well as cast films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 440: Symposia CA – Structure and Evolution of Surfaces , 1996 , 221
Copyright
Copyright © Materials Research Society 1997

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