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. 2021 Mar 27;21(7):2336. doi: 10.3390/s21072336

Figure 1.

Figure 1

(a) Sensor fabrication process: silica capillary fusion spliced to the single mode fiber (SMF) and cleaved to the desired length; graphene oxide (GO) dip coating; and finally, the sensor is placed on a furnace for 1 h at 60 °C; (b) microscope photograph of the sensing structure with the GO diaphragm at the tip of the silica capillary.