Spectroscopy of thin polyaniline films deposited during chemical oxidation of aniline

Abstract

Any surface immersed in the aqueous reaction mixture used for the preparation of polyaniline becomes coated with a polyaniline film of submicrometre thickness. In this way, various materials can be modified by an overlayer of conducting polymer. The present review illustrates the role of infrared, Raman, and UV-VIS spectroscopies in the studies of polyaniline film growth. Spectroscopic methods are crucial in the evaluation of the performance of polyaniline films alone or in combination with nanoparticles of noble metals. The assessment of film ageing and stability can be followed conveniently by these methods. Carbonization of polyaniline films to nitrogen-containing carbon analogues is also discussed.

Stem cell differentiation on conducting polyaniline

“…2). 30,31 The intensity of the peak of the vibrations in a quinonoid ring vanished the band assigned to C]N vibrations in the quinonoid units situated at 1470 cm decreased. The band of C-N stretching vibrations observed at 1220 cm À1 and the band at 1161 cm À1 of C-H bending vibrations of quinonoid rings are present in the spectrum of the PANI-B.…”

Molecular structure, optical, electrical and sensing properties of PANI-based coatings with silver nanoparticles deposited from the active gas phase

“…FTIR spectra of PANI − AgCl and PANI + AgCl coatings deposited by electron beam are shown in Fig. 3c, d. First, we can indicate appearance of polaron band above 2000 cm −1 [26] and decreased bands of free amine groups. These spectra have also a strong and broad band centered at 1160 cm −1 assigned to the vibration mode of the NH + structures which are formed during protonation process.…”

“…The PANI coatings with silver chloride, as well as by codispersion of PANI and AgCl leads to the appearance in UV-visible spectra of radical cations in the coating structure near 425 nm, polarons (near 780 nm), the delocalized radical cations (>800 nm), indicating the presence of PANI conductive states [26,31]. It can be noted that the absorption band at 400 nm refers to the peak of the surface plasmon absorption mainly of spherical silver nanoparticles [32].…”

Coaxial conducting polymer nanotubes: polypyrrole nanotubes coated with polyaniline or poly(p-phenylenediamine) and products of their carbonisation

“…Due to the compact stone-like structures of the original PPy nanotubes, which were very difficult to disperse in potassium bromide pellets, their absorption was very small. The spectra of the PPy nanotubes coated with PANI or PPDA are practically identical with the spectra of standard PANI or PPDA salts, respectively (Trchová et al, 2012;Stejskal, 2015). The absence of the bands of PPy nanotubes in the spectra can be interpreted as a result of the coating of PPy nanotubes.…”