Figure 1. (a) Schematic illustration of the AlGaN/GaN heterostructure open gate pH sensor and the graphic representation of reactions between the POH groups on the sensing surface and other ions in the aqueous solution, where Ga, Al and N atoms are represented by pink, blue and light blue. (b) Schematic illustration of the AlInN/GaN heterostructure open gate pH sensor and the graphic representation of the reactions between the POH groups on the sensing surface and other ions in the aqueous solution, where Al, In and N atoms are represented by blue, green and light blue. The hydrone (water molecules), hydrion (H ion) and hydroxyl ion are shown; O and H are represented by red and gray. (c) top view of one fabricated device [20,64]

From

Review of Recent Advances of GaN Nanowires Based Sensors

H. Murad, W. Hashim, Ahmed M. Nahhas

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