| Summary: | The NH<sub>3</sub> sensor is of great significance in preventing NH<sub>3</sub> leakage and ensuring life safety. In this work, the Pd-decorated ZnO hexagonal microdiscs are synthesized using hydrothermal and annealing processes, and the gas sensor is fabricated based on Pd-decorated ZnO hexagonal microdiscs. The gas-sensing test results show that the Pd-ZnO gas sensor has a good response to NH<sub>3</sub> gas. Specifically, it has a good linear response within 0.5–50 ppm NH<sub>3</sub> at the optimal operating temperature of 230 °C. In addition, the Pd-ZnO gas sensor exhibits good repeatability, short response time (23.2 s) and good humidity resistance (10–90% relative humidity). This work provides a useful reference for developing an NH<sub>3</sub> sensor.
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