Layer-by-layer electrostatic-assembly: magnetic-field assisted ordering of organic molecules

Dey, Sukumar ; Pal, Amlan J. (2010) Layer-by-layer electrostatic-assembly: magnetic-field assisted ordering of organic molecules Langmuir, 26 (22). pp. 17139-17142. ISSN 0743-7463

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Official URL: http://pubs.acs.org/doi/abs/10.1021/la102996t

Related URL: http://dx.doi.org/10.1021/la102996t

Abstract

During the layer-by-layer (LbL) electrostatic assembly process, we orient organic molecules (nickel phthalocyanine) by an external magnetic field. Orientation of the magnetic moment of the molecules in a monolayer is immobilized by depositing a monolayer of a suitable polycation. Due to the orientation of magnetic moments, the electrostatic adsorption process becomes enhanced in subsequent layers. By cycling the deposition sequence layer after layer, we have achieved highly ordered and closely packed LbL films of the molecules with their magnetic moments oriented perpendicular to the substrate. Nonmagnetic copper phthalocyanine expectedly showed neither a magnetic-field assisted alignment nor an enhanced adsorption in LbL film deposition process.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:65777
Deposited On:18 Oct 2011 09:12
Last Modified:18 Oct 2011 09:12

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