Optical, electrical and morphological properties of transparent binary doped polyaniline thin films synthesized by in situ chemical bath deposition

Abstract

The development of polymeric thin films has attracted attention in the optoelectronics field due to their transparency. The aim of the research presented was to obtain transparent polyaniline thin films by easy in situ oxidative polymerization of aniline with ammonium persulfate in the presence of a binary doping agent-poly(vinyl alcohol) mixture. Poly(acrylic acid), 2-acrylamido-2-methyl-1-propanesulfonic acid or sodium dodecylsulfate were mixed with hydrochloric acid to form the binary doping agents. Polyaniline thin films were produced during aniline polymerization on Corning glass slides immersed in the mixture in order to study their optical, electrical and morphological properties. The optical absorption coefficient and the energy band gap were evaluated by optical transmission of the films in the UV-visible spectral region. The optical absorption coefficient of all polyaniline films was of the order of 10 4 cm −1 with a maximum transmittance up to 80% at 550 nm. In order to investigate the effect of the mixture on the surface morphology and roughness of the films, atomic force microscopy was used. In general, surface roughness was reduced threefold by adding a mixture and optical transmission was increased by 20-30% without significantly affecting the absorption coefficient and the band gap of polyaniline. Islands and needle-like structures on the film surfaces were obtained from various mixtures affecting the conductivity; for example, 0.17 S cm −1 was obtained from needle-like morphology, while 1.9 × 10 −4 S cm −1 was obtained from island morphology. Raman spectroscopy studies confirmed the presence of poly(vinyl alcohol) in the thin films.

A high performance all-organic flexural piezo-FET and nanogenerator via nanoscale soft-interface strain modulation

“…The value of conductivity obtained by Van der Pauw measurement is 0.5 S cm À1 . 37,38 Fig. 2b shows the AC conductivity of the PANI film on the PET substrate which was recorded at room temperature using an impedance analyzer as a function of the frequency between 10 À2 Hz and 10 7 Hz.…”

Investigation of deep-level defects in conductive polymer on n-type 4H- and 6H-silicon carbide substrates using I-V and deep level transient spectroscopy techniques

“…15,16 SPAN is a p-type semiconducting polymer with a reported band gap of about 2.56 eV. 17,18 On the other hand, silicon carbide (SiC) is a wellknown material for its extraordinary mechanical and physical properties such as hardness, abrasive wear resistance, chemically inert, and high thermal conductivity. 19,20 There are many polytypes, but the technologically important ones are 3C-, 4H-, and 6H-SiC.…”

Electrochemical Study Of Effect Of The Concentration Of Monomer In The Growht Of Polyaniline and Its Capacitive Properties

“…Polyaniline (Pani) is an attractive conducting polymer given its wide range of applications such as: battery, supercapacitors, corrosion control, electrochromic and electroluminescent devices [1][2][3][4], Pani can be easily synthesized, chemically an electrochemically in both aqueous and non-aqueous solutions [5,6], however few papers report the influence of monomer concentration on growth of Pani films, it is important to realize a study kinetics growth associated with the concentration of monomer in the electrolytic medium used.…”