Writing in a Polyaniline Film with Laser Beam and Stability of the Record: A Raman Spectroscopy Study

Abstract

Lines were drawn on polyaniline (PANI) salt films with laser beam, and then the samples were left to age in air at room temperature. Both the irradiated and intact parts of the sample and their ageing were studied with Raman spectroscopy. It was found that the laser-written record is reasonably stable. The degradation of polyaniline by laser irradiation and ageing was compared to the changes in PANI during heating. In all cases, deprotonation and crosslinking of PANI chains proceed but the relative rates of the processes vary with degradation conditions. Materials and Methods2.1. Preparation of PANI Films. Polyaniline was prepared by the oxidation of 0.2 M aniline hydrochloride (Fluka, Switzerland) with 0.25 M ammonium peroxydisulfate (APS) (Lach-Ner, Czech Republic) in water [23] at room temperature. The films were deposited in situ on glass and goldcoated glass windows, 13 mm in diameter. A couple of films

Detection of energetic materials via polyaniline and its different modified forms

“…In the present study, peak lengths of polaronic peak and quinoid peak are not equal to one, thereby suggesting that equilibrium does not exist between polaron and bipolaron in the PAnis ring and hence we may believe that the orientation is more towards emeraldine salt form. This orientation in the polymeric chain of the PAnis and its modified forms play crucial role in their conductivity 35,36 and further understanding of this property explained in by CV studies.…”

Passivation of Carbon Steel Using Intelligent Epoxy Paint

“…The CEP coated carbon steel sample had an initial potential of around +0. 15 VAg/AgCl at time 467 s, which can be attributed to the barrier effect produced by the commercial coating; afterwards, a decay to potential −0.42 VAg/AgCl reached in 7150 s, which is within the oxidation potential range of the metal corrosion characteristic installed and maintained until the end of the analysis, can be attributed to the failure of the barrier effect produced by the commercial coating. IEP coated AISI 1010 steel showed instantaneous decay to the potential +0.49 VAg/AgCl, and then the potential stabilized at +0.46 VAg/AgCl over 10,968 s, as shown in Figure 7a.…”

“…The differentiation of the samples occurs with the presence of bands in the region of 400 to 800 cm −1 , which characterize the presence of C-Cl and C-O bonds. The band in the 1340 cm −1 region is attributed to the axial deformations of the C-O bonds that are associated with the aromatic ring and the 1390 cm −1 band is attributed to the -CH 3 angular stretch [12,15].…”

“…Bands in the 1441 cm −1 region are attributed to the presence of OH groups of CEP, and to IEP samples can be associated with C-N bonds of PAni EB binder. The bands at 1603 cm −1 represent the presence of C=C bonds in CEP aromatic rings for the three samples [13,15,18].…”

“…Bands in the 1441 cm −1 region are attributed to the presence of OH groups of CEP, and to IEP samples can be associated with C-N bonds of PAni EB binder. The bands at 1603 cm −1 represent the presence of C=C bonds in CEP aromatic rings for the three samples [13,15,18]. Raman analyses for the IEP samples did not show spectra that indicate the presence of PAni binder in CEP that modifies the structural characteristics of the PAni EB polymer chain, as some intensity peaks characterize the presence of PAni EB binder if it overlaps with CEP characteristic links, which are associated with the low concentration of the PAni EB binder and the CEP for the formation of the IEP, make it difficult to identify a possible chemical interaction of the PAni EB binder and the CEP, which could alter the oxidized and non-conductive state of the PAni, due to the chemical variability of the components that make up a commercial paint.…”