Spontaneous Folding Growth of Graphene on h-BN

Fan, Xiaodong; Kim, Sun-Woo; Tang, Jing; Huang, Xinjing; Zhao, Lin; Zhu, Lijun; Li, Lin; Cho, Jun-Hyung; Zeng, Changgan

doi:10.1021/acs.nanolett.0c04596

Cited by 15 publications

(10 citation statements)

References 44 publications

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“…[100] In 2021, Fan et al reported the spontaneous folding growth of graphene on the h-BN substrate at a growth temperature up to 1300 °C using CVD method. [101] Comparison of different preparation methods for tBLG is provided with respect to its costs, uniformity, variability, cleanness, and productivity, as shown in Figure 12. With relative orientation and interlayer coupling, tBLG can be obtained by i) CVD growth on metal substrates (Figure 12a), ii) man made stacking graphene layer on each other (Figure 12b), or iii) artificial folding (Figure 12c).…”

Section: Other Preparation Methods Of Tblgmentioning

confidence: 99%

Engineering of Chemical Vapor Deposition Graphene Layers: Growth, Characterization, and Properties

Yao

Liu

Sun

et al. 2022

Adv Funct Materials

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Numerous studies conducted on the layered graphene family—including the monolayer, bilayer, trilayer, few‐layer, and multilayer—draw plenty of attention to stacking modes and twist angles, which are extensively explored for its controlled growth, properties, and applications. This review provides a comprehensive overview of current challenges and opportunities for the chemical vapor deposition (CVD) growth, characterization, and electrical properties of graphene depending on the layer number and twist angles. Various state‐of‐the‐art innovations using the CVD method, which incorporates graphene synthesis through the control of metal substrates, layer numbers, and twist angles, are presented. The underlying growth mechanisms are discussed in terms of the interactions among graphene substrates/layers and its dynamic process. The characterization methods for determining the layer number and twist angle of graphene layers are summarized. Furthermore, the electrical properties and applications of graphene, particularly magic‐angle twist bilayer graphene, are briefly introduced. Finally, outlooks and perspectives for the engineering of CVD graphene layers are discussed.

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Section: Other Preparation Methods Of Tblgmentioning

confidence: 99%

Engineering of Chemical Vapor Deposition Graphene Layers: Growth, Characterization, and Properties

Yao

Liu

Sun

et al. 2022

Adv Funct Materials

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“…Reproduced with permission. [ 60 ] Copyright 2021, American Chemical Society. h,i) Schematic illustrations of the electron transfer mechanisms in h) WS 2 /MoS 2 and i) MoS 2 /WS 2 vertical vdWHs under irradiation, respectively.…”

Section: Controllable Synthesis Of 2d Vdwhs and Vdwslsmentioning

confidence: 99%

“…[ 59 ] In particular, the CVD process provides a controllable way to construct graphene origami and kirigami, which are quasi‐3D graphene structures with intriguing mechanical and electronic properties. Fan et al [ 60 ] found that the noncatalytic bulk h‐BN substrate played a significant role in the spontaneous folding of graphene by facilitating the appearance of the second layer on the existing ML graphene surface (Figure 3g). The faster growth rate for the second graphene layer compared to the first layer resulted in overtaking growth to form folded edges at a growth temperature of up to 1300 °C.…”

Section: Controllable Synthesis Of 2d Vdwhs and Vdwslsmentioning

confidence: 99%

Controllable Preparation of 2D Vertical van der Waals Heterostructures and Superlattices for Functional Applications

Liang

Yang

et al. 2022

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In general, 2D materials adopt a unique layered crystal structure, i.e., the neighboring layers are bonded together by weak van der Waals (vdW) interactions and the intralayer atoms and are bonded together through strong covalent or ionic bonds, which allows easy exfoliation of atomically thin nanosheets from their bulk counterpart. With a surface free of dangling bonds surface, 2D vdW materials can be integrated to produce next-generation vdW heterostructures (vdWHs) or vdW superlattices (vdWSLs), which provide a powerful material platform for exploring fundamentally new physics and exotic devices. For conventionally bonded heterostructures, the synthesis relies heavily on one-to-one chemical bonds, and the component materials must satisfy strict lattice matching and processing compatibility requirements. [3] It is difficult for the bonded heterostructures/superlattices between materials with mismatched lattices to maintain the intrinsic heterogeneous interface, resulting in various types of damage, such as strain, defects, atomic exchange, and distortion. [4,5] However, vdW integration can overcome the limits of bonded heterostructures, allowing unprecedented flexibility to combine materials with radically different chemical compositions, crystal structures, or electronic properties. [6][7][8] More importantly, the as-fabricated vdWHs possess atomically sharp and clean vdW interfaces along with well-defined moiré superlattices, enabling a series of unique electronic and photonic characteristics that cannot be realized in conventionally bonded heterostructures, such as ultrahigh on-current and mobility in 2D metal-semiconductor (M-S) vdWH-based field-effect transistors (FETs), [7,9] interlayer coupling and ultrafast charge transfer in transition-metal dichalcogenide (TMD) heterostructures, [10] Mott-like insulator and superconducting behavior in magic-angled graphene, [11,12] moiré excitons in twisted TMD heterobilayers, [13,14] and topological superconductivity in CrBr 3 /NbSe 2 ferromagnetic/superconductor vdWHs. [15] Therefore, developing reliable assembly methods for vdWHs or vdWSLs with atomically clean interfaces is an essential prerequisite for relevant physical exploration and practical applications.In general, the preparation methods for vdWHs or vdWSLs can be divided into top-down and bottom-up methods. To 2D van der Waals heterostructures (vdWHs) and superlattices (SLs) with exotic physical properties and applications for new devices have attracted immense interest. Compared to conventionally bonded heterostructures, the danglingbond-free surface of 2D layered materials allows for the feasible integration of various materials to produce vdWHs without the requirements of lattice matching and processing compatibility. The quality of interfaces in artificially stacked vdWHs/vdWSLs and scalability of production remain among the major challenges in the field of 2D materials. Fortunately, bottom-up methods exhibit relatively high controllability and flexibility. The growth parameters, such as the temperatur...

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“…To prepare a highly efficient cooling coating, evenly distributed and controllable coordinated Gr/ h -BN filler was considered prominently. Graphene and h -BN filler can be prepared by several methods, including the mixing of Gr and h -BN by mechanical dispersion or sonification, chemical vapor deposition (CVD) by metal catalyst, and graphene fabricated on h -BN in CH 4 /H 2 or CO 2 atmosphere. − Combustion synthesis of graphene was reported as being accessible and energy-saving, and the graphene synthesized by this method is of high quality with fewer layers . As we know, in situ growth of graphene on an h -BN surface is promising to form ideal coordinates by van der Waals interactions through the vertical orientation, which shows improved thermal conductivity compared with conventional graphene for heat dissipation.…”

Section: Introductionmentioning

confidence: 99%

In Situ Combustion Synthesis of Gr/h-BN Composites and Its Passive Heat Dissipation Application

et al. 2022

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To enhance the infrared radiation efficiency and the heat transfer performance simultaneously, graphene (Gr) was synthesized in situ on hexagonal boron nitride (h-BN) to prepare Gr/h-BN composites by a scalable combustion synthesis in CO 2 atmosphere using Mg as sacrificial solder. The synthesized Gr/h-BN composites were added in polydimethylsiloxane polymer to prepare composite coatings, which show an infrared emissivity greater than 0.95 and a through-plane thermal conductivity up to 2.584 W•m −1 •K −1 . When functioning on an Al heatsink, such a composite coating can reduce the temperature by as much as 21.7 °C. Meanwhile, the composite coating exhibits superior adhesion on the Al substrate. Therefore, Gr/h-BN composite coatings with noteworthy infrared radiation and thermal conductivity are expected to be a promising candidate for heat dissipation applications.

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Spontaneous Folding Growth of Graphene on h-BN

Cited by 15 publications

References 44 publications

Engineering of Chemical Vapor Deposition Graphene Layers: Growth, Characterization, and Properties

Engineering of Chemical Vapor Deposition Graphene Layers: Growth, Characterization, and Properties

Controllable Preparation of 2D Vertical van der Waals Heterostructures and Superlattices for Functional Applications

In Situ Combustion Synthesis of Gr/h-BN Composites and Its Passive Heat Dissipation Application

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