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. 2019 Nov 28;19(23):5246. doi: 10.3390/s19235246

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© 2019 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) SPR spectra obtained by SPR-POF sensor at different concentrations of Cu(II) in NaCl 0.1 M solution at pH = 6.8, in the range from 0 M to 1.5 × 10⁻⁴ M. (b) Resonance wavelength shift (Δλ) vs. concentration of Cu(II) in semi-log scale, with error bars and Hill fitting.