We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a π-conjugated polymer-fullerene blend using pulsed electrically detected magnetic resonance. The resonance at g = 2.0028(3) is due to polarons in the polymer, and exhibits spin locking at high microwave fields. The presence of an excess of fullerene, and the operating voltage...

The Fluorescence sensing technique for trace detection of High Energy Materials (HEMs) has gained more attention in recent times. In the present paper, interaction between fluorophore and HEMs is studied using spectroscopic electrochemical techniques. polyaniline (PANI) was functionalised by doping it with benzenesulfonic acid (BSA) to increase processability, mobility ?-electrons along decreas...

Abstract Using the solution casting method, a blend of polyvinyl alcohol/chitosan (PVA/Cs) was prepared with different amounts polypyrrole (PPy) to enhance structural and electrical conductivity films. The miscibility interaction between PVA/Cs were confirmed by FT-IR measurements shifting disappearing some bands suggesting that PVA functional group interacted every other on Cs side chain. For ...

Polyaniline-NiFe2O4 nanocomposites (PANI-NiFe2O4) with different contents of NiFe2O4 (2.5, 5 and 50 wt%) were prepared via in situ chemical oxidation polymerization, while the nanoparticles nickel ferrite were synthesized by sol-gel method. The prepared samples were characterized using some techniques such as Fourier transforms infrared (FTIR), X-ray diffraction (XRD), scanning electron microsc...

The focus of this thesis is a recently discovered organic magnetoresistance (OMAR) whose underlying mechanism remains much debated. As an introduction, the field of organic electronic is briefly discussed focusing mainly on organic light emitting diodes, the devices in which OMAR was first discovered. Important findings related to OMAR from prior work are highlighted. The frequency dependence o...

The magnetic properties of doped pellets of poly(3-methylthiophene) showing room temperature ferromagnetic behaviour have been discussed in a previous article. The magnetic behaviour was attributed to a weak ferromagnetic phase, due to the superexchange interaction of polarons via the dopant anions. The Dzialoshinsky–Morya interaction among canted spins was proposed to explain the ferromagnetis...

2014 The problem of deformation induced attraction leading to localized pairs of electrons, the so-called bipolarons, is studied in detail. The analogy between bipolarons and itinerant Cooper pairs in a superconductor is explored. It is shown that the two types of pairing result from the microscopic nature of the electron-phonon Hamiltonian and that following the coupling constant the ground-st...

Electron localization and polaron mobility in oxygen-deficient as well as Li-doped monoclinic tungsten trioxide have been studied in the adiabatic limit in the framework of density functional theory. We show that small polarons formed in the presence of oxygen vacancy prefer the bipolaronic W5+-W5+ configuration, whereas the W6+-W4+ configuration is found to be metastable. Our calculations sugg...