EPR study of the mechanism of chemical dedoping of conducting polypyrrole

Andreeva, O. A.; Burkova, L. A.

doi:10.1134/s1063783411090022

Cited by 3 publications

(2 citation statements)

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“…While in the case of PANI the salt-base transition has been well established, in the case of PPy it is mentioned only rarely and in the course of other studies. [26][27][28] Both the PPy salt and PPy base are able to reduce silver cations to silver. A formal reaction scheme of the reduction of silver ions with PPy can be proposed ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Polypyrrole–silver composites prepared by the reduction of silver ions with polypyrrole nanotubes

et al. 2013

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Polypyrrole nanotubes were prepared by the oxidation of pyrrole with iron(III) chloride in the presence of methyl orange. They were subsequently used for the reduction of silver ions to silver nanoparticles. The nanotubular form of polypyrrole is compared with the classical globular morphology in its ability to reduce silver ions. Both polypyrrole salts and bases were used in the experiments. The content of metallic silver in the resulting composite, determined by thermogravimetric analysis, was 21-31 wt%.Elemental composition is also discussed on the basis of energy-dispersive X-ray spectroscopy. Contrary to the expectation, the conductivity of polypyrrole nanotubes in salt form, 35.7 S cm À1 , was reduced to 20.9 S cm À1 after the incorporation of silver. The presence of silver had generally little effect on the conductivity. The temperature dependence of conductivity reveals that the composites maintain the semiconducting character of polypyrrole and their conductivity increased with increasing temperature. The conductivity of the composites surprisingly increased when the samples were placed in vacuo.

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Section: Resultsmentioning

confidence: 99%

Polypyrrole–silver composites prepared by the reduction of silver ions with polypyrrole nanotubes

et al. 2013

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“…The emergence of symmetric solutions in bilayer GNRs finds a direct analogy to conducting polymers. Besides the polymer one-dimensional structure, the underlying bulk conductance mechanism unfolds as a three-dimensional process on a macroscopic scale . This phenomenon is attributed to the creation of interchain polarons and bipolarons, often referred to as transverse quasiparticles. , These carriers span at least two distinct chains.…”

Section: Resultsmentioning

confidence: 99%

Strain-Tuneable Bipolaron Stability on Ultranarrow Bilayer Graphene Nanoribbon

de Sousa Araújo Cassiano,

Ribeiro Júnior,

Magela e Silva

et al. 2024

J. Phys. Chem. C

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Van der Waals bilayer systems are promoting unparalleled advance in optoelectronics. Much of their impact resorts to the exotic quantum properties of quasiparticle physics. They arise after manipulating the electronic interlayer hopping integral (t ⊥ ). However, it remains unclear how this interaction affects the formation of higher-order quasiparticles. In this work, we investigate the influence of t ⊥ on the formation of charged quasiparticles in bilayer graphene nanoribbons using a tightbinding model with lattice relaxation terms. The results show the existence of two distinct spinless carriers with 2e charge, lattice deformation, and intragap levels. These quasiparticles are characterized as bipolarons. Depending on the magnitude of t ⊥ , a transition between the configurations occurs for t ⊥ ≈ 0.52 eV. Moreover, the bipolaron binding energy (BE) is determined. Results show that interlayer bipolarons are always more stable than the usual carrier, i.e., two independent polarons. Moreover, the stability degree can be regulated with t ⊥ , leading to variations up to 58% in BE. Therefore, our findings reveal that the population of polarons and bipolarons are potentially controllable via transversal mechanical stress. Our work reveals an exciting pathway to envision new strain-tuneable nanoelectronics using graphene nanoribbon bilayers.

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