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. 2021 Jun 3;22(11):6053. doi: 10.3390/ijms22116053

Figure 3.

Figure 3

SEM images of (a) SO3H-UiO-66(Zr) optical fiber sensing element, and (b) bare optical fiber, (c) Interferograms in correlation with a lead concentration in DI water, and (d) EDX spectra of SO3H-UiO-66(Zr) optical fiber sensing element after the lead uptake.