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UV-Visible absorption spectra (a) and color changes (b) of different reaction systems. ((A) TMB + H2O2, (B) TMB + VO2 nanorod, (C) TMB + VO2 nanosheet, (D) TMB + VO2 nanofiber, (E) TMB + VO2 nanorod + H2O2, (F) TMB + VO2 nanosheet + H2O2, (G) TMB + VO2 nanofiber + H2O2).
