Charge carrier transport in polyimide with Co nanoparticles formed by ion implantation

Popok, Vladimír; Лукашевич, М. Г.; Lukashevich, S.M.; Хайбуллин, Р. И.; Bazarov, V. V.

doi:10.1016/j.susc.2004.05.063

Cited by 14 publications

(11 citation statements)

References 8 publications

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“…In Ag-and W-implanted PI film, a similar behavior (i.e., above certain irradiation fluence, the surface resistivity reaches a minimum) is observed, although the minimum is reached at a much larger fluence [15]. Moreover, the effects of percolated metallic clusters cannot be excluded [14]. In the current research, we clearly demonstrate the effect of Xe ion bombardment on the electrical properties of PI films.…”

Section: Resultssupporting

confidence: 70%

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Modification of the electrical properties of polyimide by irradiation with 80 keV Xe ions

Chen

Yao

Wang

et al. 2009

Surface and Coatings Technology

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Section: Resultssupporting

confidence: 70%

“…[14]. Selecting a relatively stable region (from 178 to 263 K) to fit the experimental data using Mott's equation, we obtain m = 0.259 (see inset to Fig.…”

Section: Resultsmentioning

confidence: 93%

Modification of the electrical properties of polyimide by irradiation with 80 keV Xe ions

Chen

Yao

Wang

et al. 2009

Surface and Coatings Technology

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“…a negative temperature coefficient of resistance, that represents a well-known behavior for ion-implanted polymers [8,14]. One of these dependences is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…(1) [8]. For instance, quantum corrections to conductance due to a weak localisation of electrons and electron-electron interaction could be possible reasons [15,16].…”

Section: Resultsmentioning

confidence: 99%

“…Spins of electrons start playing role and the conductance of such composite will vary in external magnetic field. On the one hand, the mechanisms of charge carrier transport can evolve from variable range hopping (VRH) or intercluster tunnelling for moderate metal concentration towards percolation conductance under the conditions of IMT [8]. On the other hand, an increase in the concentration of magnetic impurity in a nonmagnetic dielectric matrix leads to magnetic percolation transition from the diamagnetic to *Address correspondence to this author at the University of Gothenburg, 42196 Gothenburg, Sweden; Tel: +46 31 7723435; Fax: +46 31 7723496; E-mail: popok@physics.gu.se ferromagnetic state through the superparamagnetism of magnetic NPs [9][10][11].…”

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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Correlation of Electronic and Magnetic Properties of Thin Polymer Layers with Cobalt Nanoparticles

Kharchenko

Лукашевич

Popok

et al. 2013

Part & Part Syst Charact

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Nanoparticles (NPs) of cobalt are synthesized in shallow layers of polyimide using 40 keV implantation of Co+ ions with a few different fluences at various ion current densities. Nucleation of individual NPs at low fluencies and their percolation at high fluencies are crucial processes governing the electrical and magnetic properties of the metal/polymer nanocomposites that can be controlled by the implantation regimes. In particular, one can tune the magnetoresistance between negative and positive through appropriate choice of ion fluence and current density. The found non‐monotonous dependence of the magnetoresistance on the applied magnetic field allows suggestion of spin‐dependent domain wall scattering affecting the electron transport. The samples implanted with low fluencies demonstrate superparamagnetic behavior down to very low blocking temperatures. For high fluence (1.25 × 1017 cm−2) the transition to ferromagnetic ordering is observed that is related to the increased magnetic interaction of NPs.

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Charge carrier transport in polyimide with Co nanoparticles formed by ion implantation

Cited by 14 publications

References 8 publications

Modification of the electrical properties of polyimide by irradiation with 80 keV Xe ions

Modification of the electrical properties of polyimide by irradiation with 80 keV Xe ions

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

Correlation of Electronic and Magnetic Properties of Thin Polymer Layers with Cobalt Nanoparticles

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