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. 2022 Feb 28;12(3):151. doi: 10.3390/bios12030151

Figure 3.

Figure 3

Surface SEM images of: (A) SiO2 vertical microcavity wafer. (B) Au thin film deposited SiO2 vertical microcavity biosensor die; (C) 10%, (D) 20%, (E) 40%, and (F) 60% porosity NPG deposited SiO2 vertical microcavity biosensor die.