Formation of polyaniline Langmuir films in various solvents

Abstract

The Langmuir technique is a promising tool for creating ultrathin, highly organized films at the air–water interface. It provides high precision in controlling the structure of such quasi-two-dimensional systems, which serve as the fundamental building blocks of multilayer films obtained by transferring floating monolayers from the liquid surface onto solid substrates. The multilayer nanostructures created in this way possess unique optical and electronic properties, making them promising for micro- and nanoelectronics applications, including the design of field-effect transistors, chemical sensors, light-emitting diodes, and other devices. They are also widely used as functional anticorrosion and catalytic coatings, and even as biomimetic models in biophysics for studying molecular self-assembly processes, intermembrane interactions, and related phenomena.
In this study, the influence of the chemical nature of various donor–acceptor solvents on the formation process and physical properties of polyaniline-based monolayers was investigated. Experimental assessment was carried out using compression isotherms and atomic force microscopy (AFM).
It was established that the choice of solvent significantly affects the thermodynamics of macromolecular packing, the stability of the formed monolayer, and the final morphology of the resulting nanostructured films. In the series of solvents DMF, DMSO, and NMP, polarity increases, which is reflected in the compression isotherms: a decrease in the area occupied by molecules upon monolayer compression is observed, along with a reduction in the maximum surface pressure.

Speaker

Taranenko Andrey
Saratov
Russia

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