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(A) TEM image of CP. (B) Dark-field TEM image of CP and its corresponding TEM elemental mappings of C–K, N–K, O–K, and Zr–L signals. (C) The preparation route of PBA: i, LiCl and NaIO4; ii, NaCNBH3 and CP; iii, BTB solution (5% PEG, pH 7.4). SEM graphs of cellulose paper (D) and PBA (E, F).
