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. 2017 Mar 22;7:45086. doi: 10.1038/srep45086

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XPS spectra of the as-prepared samples: (a) survey of BC-1, (b) Bi_4f of BC-1, (c) Br_4f of BC-1, (d) C_1s of BC-1, (e) O_1s of BC-0 and BC-1, and (f) N_1s of BC-0 and BC-1.