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. 2021 May 14;11(5):1294. doi: 10.3390/nano11051294

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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(a) SWVs of different concentrations of Pb²⁺ on SPCE/OPE/BIONPs/PANI. (b) Calibration curves of the peak current vs. different concentrations of Pb²⁺. Potential vs. Ag/AgCl).