Fig. 1

The resistive-type and FET-type gas sensors with inkjet-printed Pt-In₂O₃ nanoparticles. a SEM image of the resistive-type sensor platform. The inset shows magnified electrodes after forming the Pt-In₂O₃ sensing layer. b SEM image of the FET-type sensor with a FG aligned with a CG horizontally. c The schematic cross-sectional view along line A–A’ in b. d The schematic cross-sectional view along line B–B’ in b. The channel length and width are 2 μm and 2.4 μm, respectively