CVD graphene sheets electrochemically decorated with “core-shell” Co/CoO nanoparticles

Bayev, V.; Fedotova, Julia; Kasiuk, J.; Vorobyova, S. A.; Sohor, A. A.; Komissarov, I.; Kovalchuk, N. G.; Prischepa, S. L.; Каргин, Н. И.; Andrulevičius, Mindaugas; Przewoźnik, J.; Kapusta, Cz.; Ивашкевич, Олег А.; Tyutyunnikov, S.I.; Kolobylina, N. N.; Guryeva, P. V.

doi:10.1016/j.apsusc.2018.01.245

Cited by 26 publications

(18 citation statements)

References 53 publications

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“…3b)show typical two main peaks at 780.7 and 796.6 eV on a binding energy scale for Co 2p spin-orbit doublet Co 2p 3/2 and Co 2p 1/2 , respectively. The position of the peak at 780.7 eV indicates that cobalt is in an oxidised state -according to binding energy values reported in literature for CoO (780.0, 780.3 and 780.9 eV)[29][30][31]. It is well known that cobalt monoxide CoO and cobalt oxide Co 2 O 3 show similar binding energy values of the main Co 2p 3/2 peak (CoO -780.0 eV, Co 2 O 3 -779.6 eV) in[29], and (CoO -780.3 eV, Co 2 O 3 -780.0 eV)…”

supporting

confidence: 67%

N-doped carbon material modified with cobalt nanoparticles as catalyst for oxygen reduction

Stagniūnaitė¹,

Kepenienė²,

Sukackienė³

et al. 2019

chemija

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In the present study, carbon-derived material from pulping residues, such as black liquor, was doped with a cheap nitrogen precursor, dicyandiamide, and after that modified with cobalt nanoparticles using electroless metal plating. The morphology, structure and composition of the synthesised catalyst was characterised using TEM, XPS, Raman Spectroscopy and ICP-OES, whereas the activity of the prepared catalyst was evaluated for the electro-reduction of oxygen in an alkaline medium by employing the rotating disk electrode method. It has been determined that modifying of N-doped carbon material with cobalt nanoparticles results in enhanced activity for the oxygen electro-reduction as compared with that of pure N-doped carbon material.

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supporting

confidence: 67%

N-doped carbon material modified with cobalt nanoparticles as catalyst for oxygen reduction

Stagniūnaitė¹,

Kepenienė²,

Sukackienė³

et al. 2019

chemija

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“…2, a. Анализ контраста на изображении СЭМ свидетельствует о том, что осаждение Co происходит преимущественно в виде агломераций (размером до 500 nm) из частиц вытянутой формы в сочетании с отдельными осажденными частицами (порядка 50 nm). Наблюдаемые области со светлым контрастом могут соответствовать полностью либо частично окисленным частицам, последние из которых могут характеризоваться структурой типа " Co ядро−CoO оболочка", как доказано в работе [5]. атомно-силовой микроскопии на рис.…”

Section: результатыunclassified

“…К настоящему моменту опубликовано относительно небольшое количество теоретических и экспери-ментальных исследований магнитных и гальваномагнитных свойств в структурах ферромагнетик/графен, представляющих собой наночастицы либо островки Co на CVD-графене [1,4,5]. В данных работах методами фотоэлектронной спектроскопии и магнитометрии показано, что осаждаемые частицы кобальта характеризуются заметным поверхностным окислением и часто имеют структуру типа " ядро Co-оболочка CoO".…”

Section: Introductionunclassified

“…В данных работах методами фотоэлектронной спектроскопии и магнитометрии показано, что осаждаемые частицы кобальта характеризуются заметным поверхностным окислением и часто имеют структуру типа " ядро Co-оболочка CoO". Тем не менее, электрохимическое осаждение позволяет формировать хороший омический (безбарьерный) электрический контакт, что подтверждается результатами, опубликованными в [5]. Среди механизмов, используемых для описания низкотемпературного электротранспорта и магнитотранспорта в чистом графене, как правило, применяется интерференционный механизм в теории квантовых поправок к проводимости Друде в условиях слабой локализации [6][7][8].…”

Section: Introductionunclassified

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Влияние магнитных частиц Co-CoO на свойства электропереноса в однослойном графене

Федотова¹,

Харченко²,

Федотов³

et al. 2020

Физика Твердого Тела

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Electrochemical deposition of cobalt onto the single-layer CVD graphene draw to the formation of Co-CoO/graphene composites with increased electrical resistance and magnetoresistance. It is shown that magnetoresistance is governed with two competing mechanisms – negative (NMR) and positive (PMR). NMR at low magnetic fields could be well described with localized quantum corrections to the Drude conductivity in graphene. The enhancement of PMR at high magnetic fields could be associated with the influence of Lorentz mechanism in Co-CoO particles.

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“…Finally important factors are the type, concentration and distribution of potential defects in graphene layers including polycrystalline ones as well as the properties of graphene / electric contact interfaces. These properties are mainly determined by deposited metal type and deposition technology [1][2][3]9]. 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.…”

Section: Introductionmentioning

confidence: 99%

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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CVD graphene sheets electrochemically decorated with “core-shell” Co/CoO nanoparticles

Cited by 26 publications

References 53 publications

N-doped carbon material modified with cobalt nanoparticles as catalyst for oxygen reduction

N-doped carbon material modified with cobalt nanoparticles as catalyst for oxygen reduction

Влияние магнитных частиц Co-CoO на свойства электропереноса в однослойном графене

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

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