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Topotactic Conversion of Calcium Carbide to High-Crystalline Few-Layer Graphene in Water

Abstract

The reaction of calcium carbide (CaC2) with water to produce acetylene is common in industrial productions, but its side reaction, removal of calcium from CaC2 (also termed as de-Ca) to fabricate highly graphitic carbon is highly overlooked. Herein, we reported the synthesis of high-crystalline few-layered graphene by controlling the reaction of tetragonal-phased CaC2 with water at room temperature (20~25℃). The resultant carbon materials were revealed to be highly graphitic, in ~3 nm thick, containing >93 at.% carbon. Raman evidenced their low defect contents of ~0.07 defect (D)/graphitization(G) ratio. HRTEM further verified its high graphitization degree. A formation mechanism was proposed that the C_2^(2-) "dumbbells" donate their electrons to nearby oxidative species, e.g. H+ in water, followed by the topotactic cross-linking to form conjugated sp2-carbon network. Furthermore, the capability of CaC2 reducing and re-assembly into graphitic carbon was clearly evidenced by reacting with Ag+ in non-aqueous solvent, resulting in larger quantity of graphene materials as well as small-sized Ag nanoparticles.

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Publication details

The article was received on 05 Sep 2018, accepted on 24 Oct 2018 and first published on 25 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08632J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Topotactic Conversion of Calcium Carbide to High-Crystalline Few-Layer Graphene in Water

    Y. Jia, X. Chen, G. Zhang, L. Wang, C. Hu and X. Sun, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08632J

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