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. 2015 Mar 17;15(3):6469–6482. doi: 10.3390/s150306469

Figure 2.

Figure 2

The SSRE coated with GO and the pH working electrode were built on a square-shaped glass substrate. (a) Schematic showing the individual parts of the sensor; (b) Photograph of the actual sensor fabricated on a glass substrate; (c) Photograph of the sensor packaged in an SD card; (d) Laboratory-made potentiometer that was used in the integrated pH sensor.