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. 2017 Jan 23;17(1):217. doi: 10.3390/s17010217

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© 2017 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Absorption spectra of the hierarchical NiCo₂O₄ hollow sphere with various concentrations of H₂O₂ (0.01–0.4 mM). (b) The corresponding linear calibration curve. The inset shows the photograph of color change for various concentrations.