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Nanomechanical properties of ordered phthalocyanine Langmuir–Blodgett layers

Published online by Cambridge University Press:  03 March 2011

Tammy Oshiro ,
Arnie Backstrom ,
Ann-Marie Cumberlidge ,
K.W. Hipps ,
Ursula Mazur ,
S.P. Pevovar ,
D.F. Bahr  and
Joanne Smieja
Tammy Oshiro
Affiliation:
Department of Chemistry and Materials Science Program, Washington State University, Pullman, Washington 99164-4630
Arnie Backstrom
Affiliation:
Department of Chemistry and Materials Science Program, Washington State University, Pullman, Washington 99164-4630
Ann-Marie Cumberlidge
Affiliation:
Department of Chemistry and Materials Science Program, Washington State University, Pullman, Washington 99164-4630
K.W. Hipps
Affiliation:
Department of Chemistry and Materials Science Program, Washington State University, Pullman, Washington 99164-4630
Ursula Mazur*
Affiliation:
Department of Chemistry and Materials Science Program, Washington State University, Pullman, Washington 99164-4630
S.P. Pevovar
Affiliation:
School of Mechanical and Materials Engineering and Materials Science Program, Washington State University, Pullman, Washington 99164-2920
D.F. Bahr
Affiliation:
School of Mechanical and Materials Engineering and Materials Science Program, Washington State University, Pullman, Washington 99164-2920
Joanne Smieja
Affiliation:
Department of Chemistry, Gonzaga University Spokane, Washington 99258
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The mechanical properties of monolayer and multilayer structures of several symmetrically substituted alkoxy copper phthalocyanine, CuPc(OR)8, Langmuir–Blodgett (LB) films were evaluated. One-dimensional compliance of the monolayers was determined from the slopes of the surface pressure–area isotherms. Multilayers were examined using a SPM and a commercial nanoindentation system. The nanomechanical studies show a distinct relationship between the position and length of alkoxy substituents on the Pc macrocycle and the LB film elasticity and hardness. The phthalocyanine complexes with peripheral octabutoxy and octaoctyloxy substituents form stiff LB monolayers and multilayers. The nonperipheral alkoxy derivetized CuPc films were less stiff. For monolayer films, it appears that the extent of π-π interaction determines the strength of the film. In multilayers, significant additional stability can be imparted through interdigitation of long paraffinic chains which play a significant role in determining the interlayer structure of the LB layers.

Keywords

OrganometallicNanoindentationMechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1461 - 1470
Copyright
Copyright © Materials Research Society 2004

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