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SEM micrographs of a gold-plated representative sensor. (A) Overview of the sensor connected to the TO-39 socket; (B–D) a selected region of the sensor viewed at progressively increasing magnitude. (A) Magnification = 70×, WD (working distance) = 11.0 mm, EHT (Electron High Tension) = 15.00 kV; (B) Magnification = 2.500×, WD = 11.0 mm, EHT = 15.00 kV; (C) Magnification = 10.000×, WD = 11.0 mm, EHT = 15.00 kV; (D) Magnification = 20.000×, WD = 9.5 mm, EHT = 15.00 kV.
