Fig. 2From: Detection of pH and Enzyme-Free H2O2 Sensing Mechanism by Using GdO x Membrane in Electrolyte-Insulator-Semiconductor StructureTEM images of a 3-nm-thick GdO x membrane on 40-nm-thick SiO2 layer (S2) and b zoom in view of a. TEM images of c 15-nm-thick GdO x membrane (S3) and d zoom in view of c. Thicker membrane shows clear polycrystalline grainBack to article page