Doping in poly(o-ethoxyaniline) nanostructured films studied with atomic force spectroscopy (AFS)

Micron : the International Research and Review Journal for Microscopy
Fabio L LeiteOsvaldo N Oliveira

Abstract

The study of intermolecular interactions at interfaces is essential for a number of applications, in addition to the understanding of mechanisms involved in sensing and biosensing with liquid samples. There are, however, only a few methods to probe such interfacial phenomena, one of which is the atomic force spectroscopy (AFS) where the force between an atomic force microscope tip and the sample surface is measured. In this study, we used AFS to estimate adhesion forces for a nanostructured film of poly(o-ethoxyaniline) (POEA) doped with various acids, in measurements performed in air. The adhesion force was lower for POEA doped with inorganic acids, such as HCl and H(2)SO(4), than with organic acids, because the counterions were screened by the ethoxy groups. Significantly, the morphology of POEA both in the film and in solution depends on the doping acid. Using small-angle X-ray scattering (SAXS) we observed that POEA dissolved in a mixture of dimethyl acetamide exhibits a more extended coil-like conformation, with smaller radius of gyration, than for POEA in water, as in the latter POEA solubility is lower. In AFS measurements in a liquid cell, the force curves for a POEA layer displayed an attractive region for pH>or=5 due ...Continue Reading

References

May 17, 2007·The Review of Scientific Instruments·I HorcasA M Baro
Jul 20, 2007·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·F L LeiteL H C Mattoso
Oct 2, 2007·Journal of Colloid and Interface Science·Fabio L LeiteOsvaldo N Oliveira

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Jul 4, 2018·Scanning·Clarice SteffensJuliana Steffens

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