Jump to main content
Jump to site search

Issue 46, 2018
Previous Article Next Article

Topotactic conversion of calcium carbide to highly crystalline few-layer graphene in water

Author affiliations

Abstract

The reaction of calcium carbide (CaC2) with water to produce acetylene is common in industrial production, but its side reaction, removal of calcium from CaC2 (also termed de-Ca) to fabricate highly graphitic carbon, is highly overlooked. Herein, we report the synthesis of highly crystalline few-layered graphene by controlling the reaction of tetragonal-phased CaC2 with water at room temperature (20–25 °C). The resulting carbon materials were revealed to be highly graphitic, with ∼3 nm thickness, containing >93 at% carbon. Raman spectroscopy evidenced their low defect content with a defect (D)/graphitization (G) ratio of ∼0.07. HRTEM further verified their high graphitization degree. A formation mechanism was proposed: the C22− dumbbells donate their electrons to nearby oxidative species, e.g. H+ in water, followed by topotactic cross-linking to form a conjugated sp2-carbon network. Furthermore, the capability of CaC2 reduction and re-assembly into graphitic carbon was clearly evidenced by reaction with Ag+ in non-aqueous solvent, which resulted in a larger quantity of graphene materials and small-sized Ag nanoparticles.

Graphical abstract: Topotactic conversion of calcium carbide to highly crystalline few-layer graphene in water

Back to tab navigation

Supplementary files

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, 2018,6, 23638-23643

  •   Request permissions

    Topotactic conversion of calcium carbide to highly crystalline few-layer graphene in water

    Y. Jia, X. Chen, G. Zhang, L. Wang, C. Hu and X. Sun, J. Mater. Chem. A, 2018, 6, 23638
    DOI: 10.1039/C8TA08632J

Search articles by author

Spotlight

Advertisements