Ion implantation in conjugated polymers: Mechanisms for generation of charge carriers

Moliton, André; Lucas, Bruno; Moreau, Christian; Friend, Richard H.; François, B.

doi:10.1080/01418639408240186

Cited by 37 publications

(16 citation statements)

References 45 publications

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“…% [18], which is not enough for the physical percolation of metal inclusions. In this case the contribution into conductance from the radiation-induced carbonised phase of polymer must be considered [3][4][5][6][7]. in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, electrical conductance of the implanted layer can increase up to values typical for semiconductors and even metals. This change in electrical properties is related to radiation-induced carbonization and formation of conjugated bonds [3][4][5][6][7]. In the presence of high metal concentration, which can reach some tens of at % in the implanted layer, there will be additional conductance mechanism due to the formation of metal inclusions.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoresistive Effect in PET Films with Iron Nanoparticles Synthesized by Ion Implantation

Лукашевич¹,

Popok²,

Volobuev³

et al. 2010

TOAPJ

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Thin polyethyleneterephthalate (PET) layers with Fe nanoparticles (NPs) were synthesized by high-fluence ion implantation. Temperature dependence of conductance and magnetoresistance, were studied as a function of ion fluence. It is found that the implantation with fluences of about 1.0×10 17 cm -2 causes high enough concentration of metal inclusions to provide conditions for electrical percolation that leads to an insulator-to-metal transition (IMT) in charge carrier transport mechanisms. The magnetoresistance measurements indicate that the magnetic percolation takes place at metal concentrations (fluences) lower than those needed for the electrical percolation. For the samples on insulating side of the IMT, a non-monotonous dependence of resistance in an increasing external magnetic field is observed due to anisotropic magnetoresistive effect and charge carrier scattering on magnetic inclusions. For the samples implanted with fluences ≥ 1.0×10 17 cm -2 , the magnetoresistance becomes a monotonous decreasing function of the external magnetic field which is typical for ferromagnetic metals that indicates effective magnetic coupling of the iron inclusions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetoresistive Effect in PET Films with Iron Nanoparticles Synthesized by Ion Implantation

Лукашевич¹,

Popok²,

Volobuev³

et al. 2010

TOAPJ

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“…5 Alternatively, ion implantation is another effective method to increase the conductivity of both conjugated and nonconjugated polymers. [6][7][8] The effects of ion implantation on the electrical conductivity of polyaniline have recently been studied. [9][10][11][12] The conductivities measured for ion-implanted polyaniline films are comparable to those for polyaniline doped by conventional acids.…”

Section: Introductionmentioning

confidence: 99%

Transport properties of ion-implanted and chemically doped polyaniline films

et al. 1996

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The low-temperature dc conductivity and magnetoconductivity of ion-implanted ͑Ar ϩ ͒ and chemically doped ͑H 2 SO 4 ͒ polyaniline films have been studied. The metal-insulator transition has been observed for ion-implanted polyaniline films on increasing the irradiation dose to 3ϫ10 17 ions cm Ϫ2 . The maximum values of the room-temperature conductivity reached 800 S cm Ϫ1 for ion-implanted and 8 S cm Ϫ1 for chemically doped polyaniline films. In both cases, for samples on the insulator side of the metal-insulator transition, (T)ϭ͑0͒exp͓Ϫ(T 0 /T) m ͔, where mϳ0.5, whereas for the most heavily ion-implanted polyaniline films (T)ϳT at TϾ20 K; the minimum in the (T) occurs at Tϳ20 K and a negative magnetoconductance ⌬(H,T)ϳH 2 has been observed. It is shown that electron-electron Coulomb interactions play an important role in charge-carrier transport in ion-implanted polyaniline films near the metal-insulator transition.

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“…In conjugated materials such bombardment ultimately results in loss of hydrogen. [29] Deliberate exposure to low energy (<100 eV) electrons has been successful in exposing thin films of poly(methylmethacrylate) and other materials in a modified scanning tunneling microscope (STM) and in a scanning electron microscope operating in retarded field mode. [30±32] In order to initiate a reaction, one might expect that the incident electron must have sufficient kinetic energy.…”

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confidence: 99%