Targeted removal of copper foil surface impurities for improved synthesis of CVD graphene

Murdock, Adrian T.; Engers, Christian D. van; Britton, Jude; Babenko, Vitaliy; Meysami, Seyyed Shayan; Bishop, H.E.; Crossley, Alison; Koós, Antal A.; Grobert, Nicole

doi:10.1016/j.carbon.2017.06.075

Cited by 45 publications

(32 citation statements)

References 46 publications

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“…Among these various approaches in the CVD process, modifying the surface morphologies of catalytic growth substrates is considered one of the most viable approaches for obtaining high-quality graphene. Mechanical or chemical treatments are typically used in such approach which significantly reduces the impurities present in the metal catalysts, the major source of the nucleation center, leading to the improved carrier mobility [26][27][28][29][30][31][32]. In this work, we revisit the role of surface morphology of metal catalyst to the quality of CVD graphene using commercially available copper foil via simple chemical treatments and analyze the resulting physical properties.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Direct Correlation between the CVD-Grown Graphene and the Growth Template

Lee

Seo

Jung

et al. 2018

Journal of Nanomaterials

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Chemical vapor deposition (CVD) is known to produce continuous, large-area graphene sheet with decent physical properties. In the CVD process, catalytic metal substrates are typically used as the growth template, and copper has been adopted as the representative material platform due to its low carbon solubility and resulting monolayer graphene growth capability. For the widespread industrial applications of graphene, achieving the high-quality is essential. Several factors affect the qualities of CVD-grown graphene, such as pressure, temperature, carbon precursors, or growth template. In this work, we provide detailed analysis on the direct relation between the metallic growth substrate (copper) and overall properties of the resulting CVD-grown graphene. The surface morphology of copper substrate was modulated via simple chemical treatments, and its effect on physical, optical, and electrical properties of graphene was analyzed. Based on these results, we propose a simple synthesis route to produce high-quality, continuous, monolayer graphene sheet, which can facilitate the commercialization of CVD graphene into reality.

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Section: Introductionmentioning

confidence: 99%

Unveiling the Direct Correlation between the CVD-Grown Graphene and the Growth Template

Lee

Seo

Jung

et al. 2018

Journal of Nanomaterials

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“…The precursors containing carbon or its species (such as hexane) are carrier gases used for graphene synthesis by the CVD method. Although, many substrates are used in this method, Cu foil is easy to find, compatible with process and cheap …”

Section: Introductionmentioning

confidence: 92%

“…Although, many substrates are used in this method, Cu foil is easy to find, compatible with process and cheap. 45,47 Surface electronic properties to obtain highly active anode materials are crucial for GOR. Our aim is to modify surface electronic properties of few layer graphene to enhance GOR activity.…”

Section: Introductionmentioning

confidence: 99%

Few‐layer graphene coated on indium tin oxide electrodes prepared by chemical vapor deposition and their enhanced glucose electrooxidation activity

2019

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At present, few‐layer graphene is deposited on copper (Cu) foil by chemical vapor deposition (CVD) method. Then, the few‐layer graphenes produced on the Cu foil are coated onto the indium tin oxide (ITO) electrode to investigate their glucose electrooxidation activities. Hexane and hydrogen flow rate and deposition time parameters with CVD method are examined on different Cu foils. These electrodes are characterized by scanning electron microscopy‐energy dispersive X‐ray analysis (SEM‐EDX), X‐ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Furthermore, glucose electrooxidation is examined with cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) measurements. One could note that the graphene network is clearly visible from SEM images. The deconvoluted XPS spectrum indicates that carbon appeared in the form of non‐oxygenated ring C atoms for few‐layer graphene. The few‐layer graphene structure is confirmed by Raman analysis. Few‐layer graphene/ITO produced at 5 sccm Hexane and 50 sccm hydrogen flow rate and 20 minutes deposition time (G7/ITO) reveals the best electrode activity. The specific activity of G7/ITO electrode is obtained as 6.58 mA cm−2. According to CV, CA, and EIS results, G7/ITO electrode has high electrocatalytic activity, stability, and resistance in comparison with other electrodes.

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“…Graphene has attracted considerable attention because of its fabulous mechanical, thermal, and electrical properties, and its promising application [2]. During these years, various methods have been used to prepare graphene, which can be approximately classified into bottom-up synthesis methods including chemical vapor deposition (CVD) [3,4], solution (solvent) method [5,6], and molecular beam epitaxy (MBE) [7,8], and top-down methods such as mechanical exfoliation (including the micromechanical cleavage method [1], ultrasonic method [9][10][11], and ball milling method [12], etc.) [1,[13][14][15][16], electrochemical method [17,18], oxidation-reduction method [19,20], and intercalation exfoliation method [21,22], etc.…”

Section: Introductionmentioning

confidence: 99%

High-Yield Production of Few-Layer Graphene via New-fashioned Strategy Combining Resonance Ball Milling and Hydrothermal Exfoliation

et al. 2020

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Graphene shows great potential applications in functional coating, electrodes, and ultrasensitive sensors, but high-yield and scalable preparation of few-layer graphene (FLG) by mechanical exfoliation method is still a formidable challenge. In this work, a novel two-step method for high-yield preparation of FLG is developed by combining resonance ball milling and hydrothermal treatment. During the resonance ball milling process, the utilization of magnetic Fe3O4 nanoparticles as a new “particle wedge” is beneficial to facilitate fragment and delamination of graphitic layers. In addition, further hydrothermal treatment can enhance ball milling product (BMP) exfoliation because of the shear force driven by the Brownian motion of various molecules at high temperature and high pressure. As expected, the two-step method can have high exfoliation efficiency up to 92% (≤10 layers). Moreover, the FLG nanosheet ink can easily achieve the formation of FLG coatings on the surface of various substrates, resulting in good electrical conductivity, which possesses potential applications in various fields including functional coating, energy storages, and electrochemical sensors, etc. Our work provides a new-fashioned strategy for mechanical large-scale production of graphene.

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Targeted removal of copper foil surface impurities for improved synthesis of CVD graphene

Cited by 45 publications

References 46 publications

Unveiling the Direct Correlation between the CVD-Grown Graphene and the Growth Template

Unveiling the Direct Correlation between the CVD-Grown Graphene and the Growth Template

Few‐layer graphene coated on indium tin oxide electrodes prepared by chemical vapor deposition and their enhanced glucose electrooxidation activity

High-Yield Production of Few-Layer Graphene via New-fashioned Strategy Combining Resonance Ball Milling and Hydrothermal Exfoliation

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