Oxygen intercalated graphene on SiC(0001): Multiphase SiOx layer formation and its influence on graphene electronic properties

Antoniazzi, Igor; Chagas, Thais; Matos, Matheus J. S.; Marçal, Lucas Atila Bernardes; Soares, E.A.; Mazzoni, Mário S. C.; Miwa, R. H.; Lopes, J. M. J.; Malachias, A.; Magalhães-Paniago, R.; Oliveira, M. A. L.

doi:10.1016/j.carbon.2020.05.064

Cited by 11 publications

(5 citation statements)

References 94 publications

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“…Several possible reasons have been proposed to explain this phenomenon and have been applied to the interlayer spacing engineering of 2D materials, such as in-plane stress and atomic intercalation. [51][52][53][54] The interlayer spacing of carbon materials gradually decreases with the removal of defects. [55] In contrast, the interlayer spacing of graphene-like carbon in the near-surface/interface region is only 0.37 nm; this is similar to that of SiC epitaxial graphene and in situ generated graphene in the PDC bulk (0.34-0.37 nm).…”

Section: Nanodomain Morphologies Of Sicn Filmmentioning

confidence: 99%

Abnormal Graphitization Behavior in Near‐Surface/Interface Region of Polymer‐Derived Ceramics

Lin

Pan

et al. 2022

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A free carbon phase has been proven to be beneficial for many structural and functional properties of PDCs, such as electrical conductivity, [8][9][10][11][12][13][14] electromagnetic properties, [15][16][17] electrochemical properties, [18,19] piezoelectricity, [20,21] corrosion resistance, [22] and oxidation resistance. [23] In high-temperature sensing applications, the concentration and morphology of free carbon strongly affect the electrical properties of devices and the selectivity/sensitivity of sensors. [4] In energy applications, PDCs are considered promising for electrical energy storage in devices ranging from cell phones to electric cars. [24] The electrical conductivity or free carbon morphology of PDC-based anode materials for lithium ion batteries plays an important role in achieving high reversible capacity, good rate performance, and reliable cycle stability. [25] In electromagnetic wave absorbing and shielding applications, an increase in the free carbon concentration of PDCs leads to an increase in the dielectric loss and, in turn, improves the total shielding effectiveness in terms of both absorption and reflection shielding effectiveness. [26] Therefore, the microstructural evolution of carbon and the properties resulting from the same are of great interest in this research area.This leads to the fundamental and common question of how to effectively regulate the structural evolution of carbon to further enhance the performance of PDCs. The polymer-toceramic transformation process of most PDCs mainly includes the synthesis of a preceramic precursor, shaping, cross-linking, and pyrolysis. [2,27] Amorphous PDCs undergo a devitrification process to form an amorphous multiphase system through a redistribution reaction of chemical bonds under hightemperature conditions. [2,27] The separated free carbon phase undergoes a graphitization process that plays an important role in the microstructural evolution of PDCs. [4] Many studies have claimed that the amount of free carbon within PDCs strongly depends on the thermal stability of the hydrocarbon linkages rather than on the percentage of the total carbon content of the polymer; therefore, a large number of new precursor solutions (e.g., polysiloxane or polysilazane, carbon-rich or carbonpoor polymers) and optimized heat-treatment parameters (e.g., temperature, atmosphere, and holding time) have been designed and explored to improve the graphitization level of The in situ free carbon generated in polymer-derived ceramics (PDCs) plays a crucial role in their unique microstructure and resultant properties. This study advances a new phenomenon of graphitization of PDCs. Specifically, whether in micro-/nanoscale films or millimeter-scale bulks, the surface/interface radically changes the fate of carbon and the evolution of PDC nanodomains, promotes the graphitization of carbon, and evolves a free carbon enriched layer in the near-surface/interface region. Affected by the enrichment behavior of free carbon in the near-surface/interface region, PDCs exhibit h...

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Section: Nanodomain Morphologies Of Sicn Filmmentioning

confidence: 99%

Abnormal Graphitization Behavior in Near‐Surface/Interface Region of Polymer‐Derived Ceramics

Lin

Pan

et al. 2022

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“…In addition, a DOS singularity is already present in the band structure of graphene at a saddle point in the unoccupied energy region far from the Dirac point (neutrality), known as the van Hove singularity (VHS) [21]. Thus, an efficient alternative route to reach such DOS singularity is to overdope the quasifreestanding monolayer of graphene, bringing E F at VHS [22][23][24][25][26][27][28]. However, since it was considered too far in energy from the Dirac point to be accessible by chemical doping or gating, much of the attention shifted to twisted systems [29].…”

mentioning

confidence: 99%

Clarifying the apparent flattening of the graphene band near the van Hove singularity

et al. 2022

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“…Note that there is no peak around the Fermi level for both graphene spectra as could be observed for an oxidized sample. Indeed, this type of peak could be the signature of oxygen incorporation in the SiC substrate [29]. As there is no peak, we can assume that our samples have not been in a condition to be oxidized (simultaneously exposed to O 2 and high temperature) as already mentioned in Sec.3.2.2.…”

Section: Spectroscopy and Dos Near The Fermi Levelmentioning

confidence: 89%

Growth and local electronic properties of Cobalt nanodots underneath graphene on SiC(0001)

Girard

Benbouabdellah

Chahib

et al. 2023

Carbon

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Oxygen intercalated graphene on SiC(0001): Multiphase SiOx layer formation and its influence on graphene electronic properties

Cited by 11 publications

References 94 publications

Abnormal Graphitization Behavior in Near‐Surface/Interface Region of Polymer‐Derived Ceramics

Abnormal Graphitization Behavior in Near‐Surface/Interface Region of Polymer‐Derived Ceramics

Clarifying the apparent flattening of the graphene band near the van Hove singularity

Growth and local electronic properties of Cobalt nanodots underneath graphene on SiC(0001)

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