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Investigations of Polyaniline Thin Films as a Toxic Gas Sensors in Saw and Electric System - Preliminary Results

Urbańczyk M., Jakubik W., Maciak W., Stolarczyk A.

Molecular and Quantum Acoustics

2004

Vol. 25

235-242

Presented here are the preliminary results concerning a polyaniline thin films investigations in a Surface Acoustic Wave dual-delay line and electric systems. The polyaniline films has been prepared by an open-boat, physical vapor deposition (PVD) process using chemically prepared polyaniline powder as starting material. These films were simultaneously formed in a one of the SAW dual delay lines and on the interdigital electrodes of the glass substrate for electric resistance measurements. The thickness of the polyaniline films was about 100 nm. These polyaniline films have been investigated from the point of view their sensitivity towards: nitrogen dioxide, sulphur dioxide, ammonia, H2S, carbon monoxide and hydrogen gases with different concentrations in dry air. Preliminary measurements of this two polyaniline films have been performed simultaneously in the same chamber for this same measurement conditions using an acoustic and electric methods.

Application of polyaniline film for electrode modification in anodic stripping voltammetry

Strojek J., Wagner K.

Zeszyty Naukowe. Chemia / Politechnika Śląska

2001

z. 146

319-322

Investigations of solid electrodes modified with 2,2'-bipyridyl in a polyaniline matrix were carried out. Interactions between lead and copper atoms in the solid solution change the potentials and currents of the peaks corresponding to anodic stripping. These changes cause serious errors in quantitative determination of the metals by anodic stripping voltammetry (ASV). 2'2-bipyridyl forms a stable complex with copper ions and the accuracy of lead determination is significantly improved as well. The molecules of 2'2-bipyridyl were immobilized on the electrode surface in a polyaniline film obtained during electrochemical oxidation from the solution containing aniline, the ligand, and sulphuric acid. The results discussed below enable to determine the optimum conditions for preparation of the modified electrode.