Strong Interplay between the Electron Spin Lifetime in Chemically Synthesized Graphene Multilayers and Surface‐Bound Oxygen

Náfrádi, Bálint; Choucair, Mohammad; Southon, Peter D.; Kepert, Cameron J.; Forró, Lászlø

doi:10.1002/chem.201404309

Cited by 11 publications

(14 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kochan et al proposed theoretically that short (100 ps) spin relaxation times in graphene could be partially due to resonant scattering of electrons by local magnetic moments. This resonant scattering mechanism is in qualitative agreement with experimental ESR observations of the detrimental effect of surface bound oxygen on the graphene electron spin lifetime . Sosenko et al showed that spin valve and Hanle spin precession experiments suffered from additional spin loss due to the resistance mismatch between ferromagnetic electrodes and graphene, and not for instance, Coulomb scattering .…”

Section: Graphenesupporting

confidence: 84%

See 1 more Smart Citation

Electron Spin Dynamics of Two‐Dimensional Layered Materials

Náfrádi

Choucair

Forró

2016

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

The growing library of two-dimensional layered materials is providing researchers with a wealth of opportunity to explore and tune physical phenomena at the nanoscale. Here, we review the experimental and theoretical state-of-art concerning the electron spin dynamics in graphene, silicene, phosphorene, transition metal dichalcogenides, covalent heterostructures of organic molecules and topological materials. The spin transport, chemical and defect induced magnetic moments, and the effect of spin-orbit coupling and spin relaxation, are also discussed in relation to the field of spintronics.

show abstract

Section: Graphenesupporting

confidence: 84%

Section: Graphenementioning

confidence: 99%

Electron Spin Dynamics of Two‐Dimensional Layered Materials

Náfrádi

Choucair

Forró

2016

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…The EPR technique provides detailed microscopic information about the oxidation state and the local environment of the paramagnetic ions present in the crystal down to ppm levels [44,57,58,59,60,61,30,62]. Furthermore, multi-frequency EPR measurements offer a better insight into the interactions, and high-frequency EPR measurements yield more detailed spectroscopic information [63,64,65,66,67,68,69]. Figure 4 shows the EPR spectra of both samples taken at 50 K at 9.4 GHz (a) and at 105 GHz (b).…”

Section: Resultsmentioning

confidence: 99%

Cyan titania nanowires: Spectroscopic study of the origin of the self-doping enhanced photocatalytic activity

et al. 2017

Self Cite

View full text Add to dashboard Cite

We report a detailed spectroscopic study of Ti 3+ self-doped TiO 2 nanowires prepared by high temperature annealing of the protonated titanate nanowires (TiONW) in hydrogen atmosphere. Hydrogenation causes a color change from white to cyan and a major increase of photocatalytic activity. Combination of synchrotron X-ray Diffraction and Rutherford backscattering spectrometry revealed that the bulk of the protonated titanate and Ti 3+ self-doped titania are identical. Raman spectroscopy combined with local laser heating indicated the presence of optically active states in the hydrogenated TiO 2 nanowires. Using multi-frequency electron paramagnetic resonance spectroscopy (EPR), the presence of Ti 3+ surface states on the cyan titania nanowires is confirmed. We argue that

show abstract

“…Being significantly influenced by adsorption of various atoms and molecules [16,17], localization process is a crucial issue in the physics of graphene when considering its application in multiple areas such as energy storage, molecule sensing, photovoltaics, and nanoelectronics. This phenomenon can be well observed using the electron paramagnetic resonance (EPR).…”

Section: Introductionmentioning

confidence: 99%

Strain- and Adsorption-Dependent Electronic States and Transport or Localization in Graphene

Radchenko

Sahalianov

Tatarenko

et al. 2018

Nanooptics, Nanophotonics, Nanostructures, and Their Applications

View full text Add to dashboard Cite

The chapter generalizes results on influence of uniaxial strain and adsorption on the electron states and charge transport or localization in graphene with different configurations of imperfections (point defects): resonant (neutral) adsorbed atoms either oxygen-or hydrogen-containing molecules or functional groups, vacancies or substitutional atoms, charged impurity atoms or molecules, and distortions. To observe electronic properties of graphene-ad-molecules system, we applied electron paramagnetic resonance technique in a broad temperature range for graphene oxides as a good basis for understanding the electrotransport properties of other active carbons. Applied technique allowed observation of possible metal-insulator transition and sorption pumping effect as well as discussion of results in relation to the granular metal model. The electronic and transport properties are calculated within the framework of the tight-binding model along with the Kubo-Greenwood quantum-mechanical formalism. Depending on electron density and type of the sites, the conductivity for correlated and ordered adsorbates is found to be enhanced in dozens of times as compared to the cases of their random distribution. In case of the uniaxially strained graphene, the presence of point defects counteracts against or contributes to the band-gap opening according to their configurations. The band-gap behaviour is found to be nonmonotonic with strain in case of a simultaneous action of defect ordering and zigzag deformation. The amount of localized charge carriers (spins) is found to be correlated with the content of adsorbed centres (atoms or molecules) responsible for the formation of potential barriers and, in turn, for the localization effects. Physical and chemical states of graphene edges, especially at a uniaxial strain along one of them, play a crucial role in electrical transport phenomena in graphene-based materials.

show abstract

Strong Interplay between the Electron Spin Lifetime in Chemically Synthesized Graphene Multilayers and Surface‐Bound Oxygen

Cited by 11 publications

References 49 publications

Electron Spin Dynamics of Two‐Dimensional Layered Materials

Electron Spin Dynamics of Two‐Dimensional Layered Materials

Cyan titania nanowires: Spectroscopic study of the origin of the self-doping enhanced photocatalytic activity

Strain- and Adsorption-Dependent Electronic States and Transport or Localization in Graphene

Contact Info

Product

Resources

About