Reversible graphitization of SiC: A route towards high-quality graphene on a minimally step bunched substrate

Ciochoń, Piotr; Marzec, Mateusz; Olszowska, Natalia; Kołodziej, Jacek

doi:10.1016/j.apsusc.2020.146917

Cited by 19 publications

(7 citation statements)

References 32 publications

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“…The C 1s spectrum showed evidence of primarily C–C bonding with some C–O and CO character that likely results from adventitious carbon. , To probe the buried interface of these thicker samples, an XPS depth profile analysis was performed using a GCIS to sputter the sample in situ in 10 min intervals. At a 50 min etch time, a new peak began to appear in the C 1s spectrum (Figure S2B) corresponding to the BE of Si–C. ,− With increasing etch time, the amplitude of the C–C peak progressively decreased while the amplitude of the C–Si peak increased, as shown in Figure C for peak amplitudes derived from fits of the spectra in Figure S2B. Note that the Si 2p spectrum (Figure S2C) showed evidence of Si–O at the 50 min etch time while the Si–Si peak did not shift during the etch process, indicating that sample charging did not alter the peak positions.…”

Section: Results and Discussionmentioning

confidence: 91%

Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO₂ Reduction by Molecular Catalysts

Oyetade,

Wang,

et al. 2024

ACS Appl. Mater. Interfaces

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Carbon electrodes are ideal for electrochemistry with molecular catalysts, exhibiting facile charge transfer and good stability. Yet for solar-driven catalysis with semiconductor light absorbers, stable semiconductor/carbon interfaces can be difficult to achieve, and carbon's high optical extinction means it can only be used in ultrathin layers. Here, we demonstrate a plasmaenhanced chemical vapor deposition process that achieves wellcontrolled deposition of out-of-plane "fuzzy" graphene (FG) on thermally oxidized Si substrates. The resulting Si|FG interfaces possess a silicon oxycarbide (SiOC) interfacial layer, implying covalent bonding between Si and the FG film that is consistent with the mechanical robustness observed from the films. The FG layer is uniform and tunable in thickness and optical transparency by deposition time. Using p-type Si|FG substrates, noncovalent immobilization of cobalt phthalocyanine (CoPc) molecular catalysts was employed for the photoelectrochemical reduction of CO 2 in aqueous solution. The Si|FG|CoPc photocathodes exhibited good catalytic activity, yielding a current density of ∼1 mA/cm 2 , Faradaic efficiency for CO of ∼70% (balance H 2 ), and stable photocurrent for at least 30 h at −1.5 V vs Ag/AgCl under 1-sun illumination. The results suggest that plasma-deposited FG is a robust carbon electrode for molecular catalysts and suitable for further development of aqueous-stable Si photocathodes for CO 2 reduction.

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Section: Results and Discussionmentioning

confidence: 91%

Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO₂ Reduction by Molecular Catalysts

Oyetade,

Wang,

et al. 2024

ACS Appl. Mater. Interfaces

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“…N CC ( r ) at T = 2500 K has a higher first plateau due to the increase of C–C homonuclear bonds, and no secondary plateau is observed in the inset of Figure d. It has been empirically established since the 1960s that thermal graphitization can occur on the SiC surface at a high temperature − due to Si sublimation from the surface. Although the graphene-like structure is not observed in our simulation for the bulk system, the different types of carbon clusters appear due to the increase in C–C bonds.…”

Section: Results and Discussionmentioning

confidence: 92%

Molecular Dynamics Study of Silicon Carbide Using an Ab Initio-Based Neural Network Potential: Effect of Composition and Temperature on Crystallization Behavior

Lim,

Shim,

Park

et al. 2023

J. Phys. Chem. C

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Structure and diffusion dynamics of silicon carbide (Si1–x C x ) are investigated via molecular dynamics computer simulations with ab initio-based neural network potentials, exploring the effect of composition and temperature on crystallization behaviors. A neural network potential is developed to describe high-dimensional potential energy surfaces of silicon carbide (SiC) systems, reproducing first-principles results on their potential energies and forces. The phase behavior of amorphous Si1–x C x below its experimental melting point is systematically demonstrated by analyzing the structural and dynamic properties as a function of temperature and carbon concentration x in the composition range 0 ≤ x ≤ 0.5 and the temperature range T = 2000–2600 K, compared to available experiments. The phase of Si1–x C x is characterized by analyzing the pair correlation function, coordination number, tetrahedral order parameter, SiC tetrahedron fraction, Si disordered fraction, and excess entropy. Our results indicate that the system undergoes the crystallization by organizing the short- and medium-range order as the carbon content increases, where the critical carbon fraction for crystallization increases with temperature. The addition of carbon to silicon results in the phase separation into liquid Si and crystal SiC as well as the partial crystallization of Si1–x C x . The self-diffusivity of Si1–x C x is also evaluated to understand how the structural change caused by the crystallization works on diffusion dynamics. The diffusion dynamics of Si1–x C x becomes slower with increasing carbon content and decreasing temperature, which significantly slows down with onset of the crystallization.

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“…O material obtido foi predominantemente grafeno em monocamada, com menos de 5% da área tendo flocos de grafeno de duas e três camadas que não aumentaram sua concentração com a extensão do tempo de processo. A preparação de monocamadas de grafeno por decomposição térmica de SiC tem sido outra rota viável para síntese de camadas uniformes de grafeno [90]. No entanto, a qualidade estrutural em grande escala é limitada devido às ocorrências de descontinuidade dos filmes.…”

Section: Estrutura E Obtenção De Camadas De Grafenounclassified

“…Desse modo, a decomposição de SiC pode levar a coexistência de regiões de diferentes espessuras de filme, como mostrado por microscopia eletrônica de baixa energia (LEEM) [92,93]. Apesar da não homogeneidade dos filmes obtidos, este procedimento vem sofrendo avanços, como recozimento em ultra-alto vácuo (UHV) e utilização de atmosfera inerte de argônio, processos em múltiplas etapas, controle de pressão atmosférica e grafitização controlada, acarretando filmes mais uniformes e materiais de alta qualidade, capazes de competir com grafeno de CVD [81,90,94].…”

Section: Estrutura E Obtenção De Camadas De Grafenounclassified

Híbridos de grafeno/montmorillonita e óxido de grafeno/montmorillonita como nanomateriais funcionais: uma visão da literatura atual

et al. 2021

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Resumo Os híbridos derivados de grafeno ou óxido de grafeno e o argilomineral montmorillonita são materiais cuja matriz do filossilicato oferece estabilização das camadas nanométricas das estruturas carbonáceas, além de melhoramento das propriedade físico-químicas e da biocompatibilidade. Por sua vez, o grafeno e seus derivados agregam novas funcionalidades à montmorillonita e ao aumento da reatividade. Os materiais funcionais resultantes do sinergismo entre os constituintes têm sido explorados em diferentes aplicações, como em processos de remediação ambiental por meio de adsorção e catálise, ciência de materiais, áreas biológicas e biomédicas. No âmbito dessa revisão, as principais rotas para obtenção dos híbridos de grafeno e derivados com montmorillonita são apresentadas, relacionando os fatores estruturais e interações entre os constituintes para formação dos compósitos. Ainda os principais métodos de caracterização são discutidos e as aplicações mais recentes são relacionadas às características estruturais, morfológicas, térmicas e texturais.

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Reversible graphitization of SiC: A route towards high-quality graphene on a minimally step bunched substrate

Cited by 19 publications

References 32 publications

Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO₂ Reduction by Molecular Catalysts

Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO₂ Reduction by Molecular Catalysts

Molecular Dynamics Study of Silicon Carbide Using an Ab Initio-Based Neural Network Potential: Effect of Composition and Temperature on Crystallization Behavior

Híbridos de grafeno/montmorillonita e óxido de grafeno/montmorillonita como nanomateriais funcionais: uma visão da literatura atual

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Reversible graphitization of SiC: A route towards high-quality graphene on a minimally step bunched substrate

Cited by 19 publications

References 32 publications

Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO2 Reduction by Molecular Catalysts

Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO2 Reduction by Molecular Catalysts

Molecular Dynamics Study of Silicon Carbide Using an Ab Initio-Based Neural Network Potential: Effect of Composition and Temperature on Crystallization Behavior

Híbridos de grafeno/montmorillonita e óxido de grafeno/montmorillonita como nanomateriais funcionais: uma visão da literatura atual

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Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO₂ Reduction by Molecular Catalysts

Covalent Functionalization of Silicon with Plasma-Grown “Fuzzy” Graphene: Robust Aqueous Photoelectrodes for CO₂ Reduction by Molecular Catalysts