4.3. The construction of the sensing element for NO2 gas detection designed with rGO-doped CeO2 and CeO2-doped rGO/ZnO sensitive material

The sensor module is constituted from printed circuit board (PCB), substrate with interdigitated Ag array electrode deposed by photolitografic technology and the sensitive material in amounts 15–20 mg was deposited on surface electrode. The active area for sensitive material was 10 mm 0.5 mm, Figure 21(a) and (b).
