| Summary: | Ternary systems are less studied for sensing applications due to complex synthesis procedures. However, they have more sources of resistance modulation, leading to an enhanced gas response. In this study, a ternary system, namely Au-decorated ZnO-polyaniline (PANI) composite nanofibers with different amounts of PANI (10, 25, and 50 wt.%) were synthesized for NO<sub>2</sub> gas sensing studies. First, ZnO nanofibers were synthesized by electrospinning, and then an Au layer (9 nm) was coated on the ZnO nanofibers. Finally, PANI was coated onto the prepared Au-decorated ZnO nanofibers. NO<sub>2</sub> gas sensing investigations indicated that the sensor with 25 wt.% PANI had the best response to NO<sub>2</sub> gas at 300 °C. In addition, the optimized sensor exhibited high selectivity to NO<sub>2</sub> gas. The improved performance of the optimal gas sensor was attributed to the role of Au, the formation of ZnO-PANI heterojunctions, and the optimal amount of PANI. The promising effect of this ternary system for NO<sub>2</sub> sensing was demonstrated, and it can be extended to other similar systems.
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