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. 2019 Apr 16;17:54. doi: 10.1186/s12951-019-0487-x

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Oxidase-like activity of Tb₄O₇ NPs. a A photograph showing the capability of the Tb₄O₇ NPs in catalyzing the oxidations of TMB, ABTS, and OPD that produce colored products. b Time-dependent absorption spectra of TMB catalyzed by Tb₄O₇ NPs. c Absorbance at 652 nm measured from samples containing TMB and different concentrations of Tb₄O₇ NPs. d The specific activities of Tb₄O₇ NPs. Steady-state kinetic assays of Tb₄O₇ NPs (e, f). e TMB concentration dependence of initial reaction velocity. f Double-reciprocal plot generated from (d)