Evolution of the Raman spectrum of graphene grown on copper upon oxidation of the substrate

Yin, Xiuli; Li, Yilei; Ke, Fen; Lin, Chia‐Chi; Zhao, Hongquan; Gan, Lin; Luo, Zhengtang; Zhao, Ruo; Heinz, Tony F.; Hu, Zonghai

doi:10.1007/s12274-014-0521-0

Cited by 66 publications

(57 citation statements)

References 41 publications

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“…Broadening of both peaks and a redshift upon oxidation was found (i.e. ∼10 cm -1 (G) and ∼48 cm -1 (2D), data not shown), which is in accordance to similar experiments performed by Yin et al 49 It can be concluded that the presence of a partially oxidized copper/graphene interface hampers the analysis of as-grown graphene due to this uncontrolled Cu oxidation process, mandating the transfer process.…”

Section: Resultssupporting

confidence: 90%

Single-Layer Graphene Synthesis on a Al₂O₃(0001)/Cu(111) Template Using Chemical Vapor Deposition

Verguts¹,

Vrancken

Vermeulen³

et al. 2016

ECS J. Solid State Sci. Technol.

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The parameter space of graphene growth using chemical vapor deposition on an untwinned single-crystalline Al 2 O 3 (0001)/Cu(111) template is discussed. The influence of growth temperature, methane flow and carbon dose is examined to assess graphene quality and multilayer coverage. An optimized growth window is identified yielding single-layer graphene. Production temperatures above 850 • C result in a graphene quality improvement, but also an increase in multilayer coverage. Adapting graphene dosages by minimizing the growth time is the key element to reduce the amount of multilayer domains without affecting the quality. After graphene transfer, the multilayer graphene areas show a large increase in I 2D /I G peak ratio, which indicates a turbostratic stacking order of graphene multilayer domains. Two growth models are put forward, i.e. a carbon penetration mechanism and an adsorption-diffusion mechanism.

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Section: Resultssupporting

confidence: 90%

Single-Layer Graphene Synthesis on a Al₂O₃(0001)/Cu(111) Template Using Chemical Vapor Deposition

Verguts¹,

Vrancken

Vermeulen³

et al. 2016

ECS J. Solid State Sci. Technol.

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“…Figure 1 shows the time evolution of the intensities of the Raman signal for CuO (at 500 cm −1 311) and Cu 2 O (at 640 cm −1 3112425), Cu(OH) 2 (at 800 cm −1 324). In the case of the bare copper sample, both Cu 2 O and, to a smaller extent, Cu(OH) 2 start forming at around 100 °C (that is, after 10 minutes from the beginning of the experiment; Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Evolution of the Raman signal intensity as bare (black squares), G-coated (blues triangles) and hBN-coated (red asterisks) copper samples are heated up from RT to 400 °C within 45 minutes for ( a ) CuO at 500 cm −1 311 ( b ) Cu 2 O at 640 cm −1 3112425 and ( c ) Cu(OH) 2 at 800 cm −1 324. The grey area indicates when graphene is etched away upon reaction with ambient oxygen, thus leaving the copper surface uncoated (see Fig.…”

Section: Figurementioning

confidence: 99%

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Real-time oxide evolution of copper protected by graphene and boron nitride barriers

Galbiati

Stoot

Mackenzie

et al. 2017

Sci Rep

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Applying protective or barrier layers to isolate a target item from the environment is a common approach to prevent or delay its degradation. The impermeability of two-dimensional materials such as graphene and hexagonal boron nitride (hBN) has generated a great deal of interest in corrosion and material science. Owing to their different electronic properties (graphene is a semimetal, whereas hBN is a wide-bandgap insulator), their protection behaviour is distinctly different. Here we investigate the performance of graphene and hBN as barrier coatings applied on copper substrates through a real-time study in two different oxidative conditions. Our findings show that the evolution of the copper oxidation is remarkably different for the two coating materials.

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“…Our rationale for choosing these quantities is that increasing FWHM linewidths of the 2D-and G-bands, decreasing values of (I 2D /I G ), and increasing values of (I D /I G ) are generally indicative of the degradation of monolayer graphene quality. 16,17 Specifically, the magnitude of (I D /I G ) represents the deviation from the perfect sp 2 hybridization of monolayer graphene as the result of defects/edges or the formation of chemical bonds between graphene p-electrons and other molecules. In fact, the intensifying (I D /I G ) ratio in Figs.…”

Section: Results and Analysismentioning

confidence: 99%

Spectroscopic studies of the physical origin of environmental aging effects on doped graphene

Chang

Hsu

Liu

et al. 2016

Journal of Applied Physics

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The environmental aging effect of doped graphene is investigated as a function of the organic doping species, humidity, and the number of graphene layers adjacent to the dopant by studies of the Raman spectroscopy, x-ray and ultraviolet photoelectron spectroscopy, scanning electron microscopy, infrared spectroscopy, and electrical transport measurements. It is found that higher humidity and structural defects induce faster degradation in doped graphene. Detailed analysis of the spectroscopic data suggest that the physical origin of the aging effect is associated with the continuing reaction of H 2 O molecules with the hygroscopic organic dopants, which leads to formation of excess chemical bonds, reduction in the doped graphene carrier density, and proliferation of damages from the graphene grain boundaries. These environmental aging effects are further shown to be significantly mitigated by added graphene layers.

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Evolution of the Raman spectrum of graphene grown on copper upon oxidation of the substrate

Cited by 66 publications

References 41 publications

Single-Layer Graphene Synthesis on a Al₂O₃(0001)/Cu(111) Template Using Chemical Vapor Deposition

Single-Layer Graphene Synthesis on a Al₂O₃(0001)/Cu(111) Template Using Chemical Vapor Deposition

Real-time oxide evolution of copper protected by graphene and boron nitride barriers

Spectroscopic studies of the physical origin of environmental aging effects on doped graphene

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Evolution of the Raman spectrum of graphene grown on copper upon oxidation of the substrate

Cited by 66 publications

References 41 publications

Single-Layer Graphene Synthesis on a Al2O3(0001)/Cu(111) Template Using Chemical Vapor Deposition

Single-Layer Graphene Synthesis on a Al2O3(0001)/Cu(111) Template Using Chemical Vapor Deposition

Real-time oxide evolution of copper protected by graphene and boron nitride barriers

Spectroscopic studies of the physical origin of environmental aging effects on doped graphene

Contact Info

Product

Resources

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Single-Layer Graphene Synthesis on a Al₂O₃(0001)/Cu(111) Template Using Chemical Vapor Deposition

Single-Layer Graphene Synthesis on a Al₂O₃(0001)/Cu(111) Template Using Chemical Vapor Deposition