Low-Temperature Chemical Vapor Deposition Growth of Graphene from Toluene on Electropolished Copper Foils

Zhang, Bin; Lee, Wi Hyoung; Piner, Richard D.; Kholmanov, Iskandar; Wu, Yaping; Li, Huifeng; Ji, Hengxing; Ruoff, Rodney S.

doi:10.1021/nn204827h

Cited by 246 publications

(199 citation statements)

References 24 publications

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“…We anticipate that in future experiments it should be possible to reduce the roughness of the pentacene layers when deposited on graphene grown on electropolished Cu, which has lower surface roughness than bare Cu foil. 46 The question is then: if pentacene adopts a different growth mode directed by the 1-D wrinkle template, how does the wrinkle height influence molecular resonance states? To address this issue, we performed local point-probe STS measurements on pentacene adsorbed on wrinkles and compared the spectral signature with pentacene adsorbed on flat-region graphene (as shown in the STS schematic in Fig.…”

Section: Resultsmentioning

confidence: 99%

Graphene wrinkle effects on molecular resonance states

et al. 2018

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Wrinkles are a unique class of surface corrugations present over diverse length scales from Kinneyia-type wrinkles in Archean-era sedimentary fossils to nanoscopic crinkling in two-dimensional crystals. Lately, the role of wrinkles on graphene has been subject to debate as devices based on graphene progress towards commercialization. While the topology and electronic structure of graphene wrinkles is known, data on wrinkle geometrical effects on molecular adsorption patterns and resonance states is lacking. Here, we report molecular superstructures and enhancement of free-molecular electronic states of pentacene on graphene wrinkles. A new trend is observed where the pentacene energy gap scales with wrinkle height, as wrinkles taller than 2 nm significantly screen metal induced hybridization. Combined with density functional theory calculations, the impact of wrinkles in tuning molecular growth modes and electronic structure is clarified at room-temperature. These results suggest the need to rethink wrinkle engineering in modular devices based on graphene and related 2D materials interfacing with electronically active molecules.

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Section: Resultsmentioning

confidence: 99%

Graphene wrinkle effects on molecular resonance states

et al. 2018

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“…Minor variations in preparation conditions can significantly influence the delicate balance of conflicting demands: high activity, high selectivity, and longterm stability. Several classic synthesis methods have been developed for preparing graphitized nanocarbon-supported catalysts, including impregnation [58][59][60][61][62], chemical vapor deposition [63][64][65], precipitation and coprecipitation [47,48,66], and liquid-phase reduction [67,68]. Owing to the high surface area and excellent physical and chemical properties of graphitized nanocarbon, highly and uniformly dispersed active metals can be achieved by traditional loading methods.…”

Section: Preparation Of Graphitized Nanocarbon-supported Catalystsmentioning

confidence: 99%

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

Huang

2017

Sci. China Mater.

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Graphitized nanocarbon materials can be an ideal catalyst support for heterogeneous catalytic systems. Their unique physical and chemical properties, such as large surface area, high adsorption capacity, excellent thermal and mechanical stability, outstanding electronic properties, and tunable porosity, allow the anchoring and dispersion of the active metals. Therefore, currently they are used as the key support material in many catalytic processes. This review summarizes recent relevant applications in supported catalysts that use graphitized nanocarbon as supports for catalytic oxidation, hydrogenation, dehydrogenation, and C-C coupling reactions in liquid-phase and gas-solid phase-reaction systems. The latest developments in specific features derived from the morphology and characteristics of graphitized nanocarbon-supported metal catalysts are highlighted, as well as the differences in the catalytic behavior of graphitized nanocarbon-supported metal catalysts versus other related catalysts. The scientific challenges and opportunities in this field are also discussed. Keywords: nanocarbon materials; graphitized carbon supports; metal catalysts; hetergeneous catalysis INTRODUCTIONCarbon combines its atoms in diverse hybridization states (sp, sp 2 , sp 3 ) to form a variety of polymorphs. These are composed entirely of carbon but have different physical structures and different names, including diamond, graphite, fullerenes, and carbines, among others [1][2][3][4][5]. Because these various and versatile allotropes produce materials with a large range of properties, carbon materials can be used in a number of technological processes, including high-tech catalytic ones [6][7][8][9][10].In heterogeneous catalysis, carbon material plays wellestablished and important roles in a wide range of applications, both as catalyst in its own right and as a unique support material [11][12][13][14][15]. The chemical stability of carbon supports in some specifically aqueous phase biomass conversion surpasses that of metal oxide materials; in addition, carbon materials present other common and key advantages as support materials for catalysis [1,5]. From the point of physical structure, porous carbon can be prepared in different forms (granules, cloth, fibers, pallets, etc.). Due to its chemical properties, carbon structure is resistant to both acidic and basic media. The structure of carbon is stable at high temperature (even above 1023 K under inert atmosphere). The hydrophilic/ hydrophobic nature of carbon can be easily modified. Active metals on the support can be easily reduced. For the purposes of industrial economy and environment, the active phase can be easily recovered. Conventional carbon supports are lower-cost and more easily available than other conventional supports. Although several kinds of carbon materials have been studied, active carbon (AC) [12,[16][17][18][19] and, to a lesser extend, carbon black [20][21][22][23] have long been the most commonly used carbon supports. AC is an amorphous solid prepa...

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“…One of the most profound surface features on a Cu substrate is a rolling mark introduced by cold rolling during the manufacturing process. The most common means of eliminating rolling marks is electro-polishing [44,45]. However, this has proved to be ineffective and insufficient to suppress the nucleation density because, although electro-polishing removes many surface irregularities, there are many other sites at which graphene can nucleate, preventing any significant reduction of the nucleation density.…”

Section: Substrate Pretreatmentmentioning

confidence: 99%

Overlook of current chemical vapor deposition-grown large single-crystal graphene domains

Park¹,

Kim²,

Park³

2014

Carbon letters

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Exceptional progress has been made with chemical vapor deposition (CVD) of graphene in the past few years. Not only has good monolayer growth of graphene been achieved, but large-area synthesis of graphene sheets has been successful too. However, the polycrystalline nature of CVD graphene is hampering further progress as graphene property degrades due to presence of grain boundaries. This review will cover factors that affect nucleation of graphene and how other scientists sought to obtain large graphene domains. In addition, the limitation of the current research trend will be touched upon as well.

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Low-Temperature Chemical Vapor Deposition Growth of Graphene from Toluene on Electropolished Copper Foils

Cited by 246 publications

References 24 publications

Graphene wrinkle effects on molecular resonance states

Graphene wrinkle effects on molecular resonance states

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

Overlook of current chemical vapor deposition-grown large single-crystal graphene domains

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