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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/).
(A) Color changes of the solution under different conditions. The “+” indicates the presence of the corresponding substance. (B) Absorption spectra of the catalytic AuNP solution under different conditions. The final concentrations of I− and cysteine were 5 μM and 50 μM, respectively.