Electrical conductivity and magnetoresistance in twisted graphene electrochemically decorated with Co particles

Fedotov, А.К.; Prischepa, S. L.; Fedotova, Julia; Bayev, V.; Ronassi, Ali Arash; Komissarov, I.; Kovalchuk, N. G.; Vorobyova, S. A.; Ивашкевич, Олег А.

doi:10.1016/j.physe.2019.113790

Cited by 14 publications

(20 citation statements)

References 45 publications

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“…The growth conditions of the experimental graphene layers were described in detail earlier [14,31,33,34]. The synthesis method was low atmospheric pressure chemical vapor deposition onto a 25 µm thick copper foil (Alfa Aesar 99.8% purity) from С 10 Н 22 n-decane as precursor with nitrogen as carrier gas.…”

Section: Methodsmentioning

confidence: 99%

“…The quality of the graphene layer was also studied by Raman spectroscopy on a Confotec NR500 selected are Raman instrument with a 473 nm excitation wavelength and an approx. 3 cm -1 spectral resolution [14,[33][34][35][36]. Additionally the thickness of graphene transferred to glass was measured by 400-800 nm light transmittance (PROSCAN MC-121 spectrometer).…”

Section: Methodsmentioning

confidence: 99%

“…Despite the large number of CVD graphene structure studies there are but scarce data on the electronic and galvanomagnetic properties of specimens in the form of metallic islands on graphene. There are studies of the effect of electrodeposited cobalt nanoparticles on the properties of twisted graphene [6,9,10,11,13,14]. Photoelectron spectroscopy and magnetometry showed that electrodeposited cobalt particles undergo intense surface oxidation and preferentially form Co core / CoO shell structures.…”

Section: Introductionmentioning

confidence: 99%

“…Photoelectron spectroscopy and magnetometry showed that electrodeposited cobalt particles undergo intense surface oxidation and preferentially form Co core / CoO shell structures. Nevertheless electrodeposition is helpful in the fabrication of Ohmic contacts [14].…”

Section: Introductionmentioning

confidence: 99%

“…Medium localization (between weak and strong) requires both interference and hopping transport mechanisms be taken into account [19][20][21]. Metallic particles (islands) deposited onto composite structures containing graphene layers may form spatially distributed (defragmented) metallic bridges [14,31] which can bend current paths in graphene layers in a transverse magnetic field (through the effect of Lorentz force) and trigger the contribution of extraordinary magnetoresistance effect to magnetotransport [32]. Obviously the combination of the abovementioned transport mechanisms in metal/ graphene structures will be determined by defect density, graphene synthesis method and metal/graphene layer interface quality.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of cobalt particle deposition on quantum corrections to Drude conductivity in twisted CVD graphene

Fedotov¹,

Прищепа²,

Fedotov³

et al. 2019

MoEM

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Graphene applications in electronics require experimental study of the formation of high-quality Ohmic contacts and deeper understanding of electron transport mechanisms at metal/grapheme contacts. We have studied carrier transport in twisted CVD graphene decorated with electrodeposited Co particles forming Ohmic contacts with graphene layers. We have compared layer resistivity as a function of temperature and magnetic field R�(T, B) for as-synthesized and decorated twisted graphene on silicon oxide substrates. Experiments have proven the existence of negative (induction < 1 Tl) and positive (induction > 1 Tl) contributions to magnetoresistance in both specimen types. The R�(T, B) functions have been analyzed based on the theory of 2D quantum interference corrections to Drude conductivity taking into account competition of hopping conductivity mechanism. We show that for the experimental temperature range (2–300 K) and magnetic field range (up to 8 Tl), carrier transport description in test graphene requires taking into account at least three interference contributions to conductivity, i.e., from weak localization, intervalley scattering and pseudospin chirality, as well as graphene buckling induced by thermal fluctuations.

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Section: Methodsmentioning

confidence: 99%