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SEM images and EDS characterization of fabricated spherical head fiber-optic pH probe. Overview of the pH sensor probe structure was shown in low (a) and high (b) magnification. Probe surface elemental characterization of carbon, oxygen, silica and chlorine was done by EDS scanning and showed both in chart (c) and energy distribution plot (d). Scale bar showed in SEM images are 30 μm (a) 500 nm (b).
