Irradiation induced crossover from 1D to 3D transport behaviors of PEDOT‐titanium dioxide hybrid nanocomposites

Abstract

Conductive poly(3,4‐ethylenedioxythiophene)/TiO2 nanocomposites were synthesized via a facile oxidative polymerization approach using dodecylbenzene sulfonic acid as a dopant and ammonium peroxydisulfate as an oxidant and irradiated with 90 MeV O7+ ions at the fluences of 5 × 1010, 1 × 1011, 5 × 1011, and 1 × 1012 ions cm−2 using 15UD Pelletron accelerator under high vacuum. X‐ray diffraction studies show that microstrain and domain crystallite size of the nanocomposites increases with the increase of ion fluence resulting in highly ordered PEDOT‐TiO2 nanocomposites. Thermogravimmetric analysis shows that the thermal stability of the nanocomposites increases with the increase of irradiation fluences which can be attributed to the crosslinking of polymer chains due to high electronic energy deposition. Scanning electron micrographs show that there is grain growth after swift heavy ion (SHI) irradiation resulting highly dense and less porous microstructure of nanocomposite films. DC conductivity of unirradiated nanocomposites exhibits Mott's 1D variable range hopping (VRH) mechanism. However, there is cross over to 3D VRH mechanism at higher irradiation fluence of 5 × 1011 and 1 × 1012 ions cm−2. There is an enhancement in the electrical conductivity of the nanocomposites upon SHI irradiation correlating crosslinking with DC conductivity of the nanocomposites.

Core/shell-structured, covalently bonded TiO2/poly(3,4-ethylenedioxythiophene) dispersions and their electrorheological response: the effect of anisotropy

“…The vibrations at 972, 830 and 670 cm À1 were attributed to the C-S bond in the thiophene ring and the vibrations at 3000-2800 cm À1 were also attributed to the aliphatic C-H stretching mode due to the DBSA molecules. 40 The ATR-FTIR spectra of nanoparticle-TiO 2 , surface functionalizated-nanoparticle-TiO 2 and nanoparticle-TiO 2 / PEDOT can be found in the ESI (Fig. S1 †) and show similar distinctive characteristic absorptions.…”

Facile synthesis and characterization of polypyrrole-multiwalled carbon nanotubes by in situ oxidative polymerization

“…where σ 0 and T mott are the conductivity at infinitive temperature and characteristic temperature, respectively. From the 3D VRH model [30]:…”

Flexible Electrochemical Transducer Platform for Neurotransmitters

“…It can be observed from the FTIR spectra (Figure S1c) that PT3 showed a shift in the characteristic bands of titania and PEDOT suggest its various interactions established between titania and PEDOT in the PT nanocomposite. Hence, the structural observations made from FTIR imply the effective interface between the PEDOT and titania existing in PT nanocomposites, and the results are strengthened by the observation made by other researchers …”

“…Hence, the structural observations made from FTIR imply the effective interface between the PEDOT and titania existing in PT nanocomposites, and the results are strengthened by the observation made by other researchers. 55 …”

“…Hence, the structural observations made from FTIR imply the effective interface between the PEDOT and titania existing in PT nanocomposites, and the results are strengthened by the observation made by other researchers. 55 The photophysical properties of the TiO 2 , PEDOT, PT3, and PTS3 were studied by UV−visible absorption spectroscopy in ethanol and are shown in Figure S2a−d. Titania nanoparticles showed absorption maximum at 330 nm, and the UV− visible spectra of PEDOT exhibited bands at 380 nm because of π−π* and PTs exhibited a broad strong absorption band at 800−900 nm which is attributed to the polaron−π* transition.…”