Copper-Containing Carbon Feedstock for Growing Superclean Graphene

Jia, Kaicheng; Zhang, Jincan; Lin, Li; Li, Zhenzhu; Gao, Jing; Sun, Luzhao; Xue, Ruiwen; Li, Jiayu; Kang, Ning; Luo, Zhengtang; Rümmeli, Mark H.; Peng, Hailin; Liu, Zhongfan

doi:10.1021/jacs.9b02068

Cited by 56 publications

(59 citation statements)

References 25 publications

(38 reference statements)

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“…[14][15][16] Nevertheless, it is still difficult to grow uniform and ultraclean TMDCs over large areas. [17,18] To tackle these issues, we may learn the lesson from graphene growth. [19][20][21] In typical graphene growth by CVD, the carbon source is dissolved in the bulk or subsurface of catalytic substrates like nickel or copper, followed by precipitation at the substrate surface to grow uniform graphene over large areas.…”

Section: Introductionmentioning

confidence: 99%

Dissolution-precipitation growth of uniform and clean two dimensional transition metal dichalcogenides

Cai

Lai

Zhao

et al. 2020

National Science Review

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Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted much interest and shown promise in many applications. However, it is challenging to obtain uniform TMDCs with clean surfaces, because of the difficulties in controlling the way the reactants are supplied to the reaction in the current chemical vapor deposition (CVD) growth process. Here, we report a new growth approach called “dissolution-precipitation” (DP) growth, where the metal sources are sealed inside glass substrates to control their feeding to the reaction. Noteworthy, the diffusion of metal source inside glass to its surface provides a uniform metal source on the glass surface, and restricts the TMDC growth to only a surface reaction while eliminates unwanted gas-phase reaction. This feature gives rise to highly-uniform monolayer TMDCs with a clean surface on centimeter-scale substrates. The DP growth works well for a large variety of TMDCs and their alloys, providing a solid foundation for the controlled growth of clean TMDCs by the fine control of the metal source.

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Section: Introductionmentioning

confidence: 99%

Dissolution-precipitation growth of uniform and clean two dimensional transition metal dichalcogenides

Cai

Lai

Zhao

et al. 2020

National Science Review

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“…Amorphous carbon introduced during the high-temperature CVD growth process has been reported recently to be another primary origin of surface contamination. [21,22] Herein, based on this,wedescribe an efficient route to synthesize submeter-long samples of defect-free,s uperclean graphene by using CO 2 as am ild etchant to selectively eliminate intrinsic contamination, i.e., amorphous carbon ( Figure 1aand Figures S1 and S2). We found that the availability of superclean graphene surfaces ensures as ignificant reduction of polymer residues after the transfer of graphene onto functional substrates.F urthermore,t he elimination of amorphous carbon and transfer-related polymer residues collaboratively contributes to enhanced optical and electrical properties, which would certainly widen the avenues towards graphenebased applications in the future.…”

mentioning

confidence: 99%

Large‐Area Synthesis of Superclean Graphene via Selective Etching of Amorphous Carbon with Carbon Dioxide

et al. 2019

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Contamination commonly observed on the graphene surface is detrimental to its excellent properties and strongly hinders its application. It is still a great challenge to produce large‐area clean graphene film in a low‐cost manner. Herein, we demonstrate a facile and scalable chemical vapor deposition approach to synthesize meter‐sized samples of superclean graphene with an average cleanness of 99 %, relying on the weak oxidizing ability of CO2 to etch away the intrinsic contamination, i.e., amorphous carbon. Remarkably, the elimination of amorphous carbon enables a significant reduction of polymer residues in the transfer of graphene films and the fabrication of graphene‐based devices and promises strongly enhanced electrical and optical properties of graphene. The facile synthesis of large‐area superclean graphene would open the pathway for both fundamental research and industrial applications of graphene, where a clean surface is highly needed.

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“…In this process, the carbon species or other carbon-hydrogen species generated from the decomposition of acetate groups took the roles of reductants. Meanwhile, the carbon species decomposed from acetate groups could also act as carbon source 44 to feed the growth of SWCNTs. Fig.…”

Section: Resultsmentioning

confidence: 99%

Carbon-Involved Near-Surface Evolution of Cobalt Catalyst during Reaction: An in-situ Study

Yang

Zhao

Wang

et al. 2020

Preprint

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Abstract When carbon-containing species are involved in reactions catalyzed by transition metals at high temperature, the diffusion of carbon on/in catalysts dramatically influence the catalytic performance. Acquiring information on the carbon-diffusion-involved evolution of catalysts at atomic level is crucial for understanding the reaction mechanism yet also challenging. For the chemical vapor deposition process of single-walled carbon nanotubes (SWCNTs), we developed methodologies to record in-situ the near-surface structural and chemical evolution of Co catalysts with carbon permeation using an aberration-corrected environmental transmission electron microscope and the synchrotron X-ray absorption spectroscopy. The nucleation and growth of SWCNTs were linked with the partial carbonization of catalysts and the alternating dissolvement-precipitation of carbon in catalysts. The dynamics of carbon atoms in catalysts brings deeper insight into the growth mechanism of SWCNTs and also sheds light on inferring mechanisms of more reactions. The methodologies developed here will find broad applications in studying catalytic and other processes.

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Copper-Containing Carbon Feedstock for Growing Superclean Graphene

Cited by 56 publications

References 25 publications

Dissolution-precipitation growth of uniform and clean two dimensional transition metal dichalcogenides

Dissolution-precipitation growth of uniform and clean two dimensional transition metal dichalcogenides

Large‐Area Synthesis of Superclean Graphene via Selective Etching of Amorphous Carbon with Carbon Dioxide

Carbon-Involved Near-Surface Evolution of Cobalt Catalyst during Reaction: An in-situ Study

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