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. 2022 Apr 1;189(4):171. doi: 10.1007/s00604-022-05272-y

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Fig. 2 — a SEM–EDX image of a magnification of AuNTs/CSPE. Scale bar corresponds to 600 µm. b Cyclic voltammograms from − 0.5 to 1.5 V (vs Ag ref. electrode) of a CSPE (black line) and an AuNTs/CSPE (red line) in 0.1 M H₂SO₄. Scan rate: 100 mVs⁻¹. c Optical microscope white light and d fluorescence images of TAMRA-Probe-SH/AuNTs /CSPE. Fluorescence signal is only detected in the yellowish areas (left) where Probe-SH/ AuNTs are present