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. 2016 Jan 27;6:19952. doi: 10.1038/srep19952

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(a) Top view of C₂N-h2D lattice. The brown and blue balls represent the C and N atoms respectively. The unit cell is indicated by the dashed rhombus and the inscribed circle is indicated by the yellow circle. (b) Side view of the penetration path of He passing through the pore of C₂N-h2D. The white ball represents the He atom.