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AFM Study of Two-Dimensional Epitaxial Arrays of Poly(gamma-L-glutamates) with Long n-Alkyl Side Chains on Graphite

Lookup NU author(s): Dr Naoko Sano

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Abstract

Two-dimensional (2D) arrays of poly(ç-n-alkyl L-glutamates) (PGn) on HOPG are found to be formed by casting under conditions producing submonolayer coverage. Direct observation of the arraysin a series of polymers using atomic force microscopy allowed clear visualization of the island structures, which consisted of parallel running rods. The helical polymer chains were epitaxially aligned to formrods with a “head to head” or a “head to tail” association. In the array composed of rods, the extended alkyl side chains with all-trans conformation are divided to both sides of a helical main chain and alignperpendicularly to the main chain. The interval distances between parallel rods in the island increased linearly by about 2.2 Å/CH2 unit with increasing alkyl side chain length. Epitaxial adsorption of alkylchain moieties onto graphite is the primary driving force in the formation of the 2D array structure of these helical polymers.

Publication metadata

Author(s): Imase T, Ohira A, Okoshi K, Sano N, Kawauchi S, Watanabe J, Kunitake M

Publication type: Article

Publication status: Published

Journal: Macromolecules

Year: 2003

Volume: 36

Issue: 6

Pages: 1865-1869

ISSN (print): 0024-9297

ISSN (electronic): 1520-5835

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/ma021421z

DOI: 10.1021/ma021421z

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