本发明公开了一种基于PANI@g‑C₃N₄纳米复合材料的氨气传感器及其制备方法和应用，属于气体传感器与环境监测技术领域。本发明首先将三聚氰胺和碳酸氢钠混入水中，搅拌成糊状，干燥后焙烧后得到NaCO₃/Bulk‑C₃N₄，然后采用水热 法剥离Bulk‑C₃N₄，焙烧后得到g‑C₃N₄二维片状材料，采用原位化学氧化聚合法制备PANI@g‑C₃N₄氨气气敏材料，最后通过静电力自组装制备PANI@g‑C3N4氨气传感器。本发明制备的PANI@g‑C₃N₄氨气传感器具有良好的气敏性能，在室温下对低浓度氨气有良好的响应，检出限可达2ppm级别，具有广阔的应用前景。

The present invention discloses a method based on PANI@g‑C₃N₄ nanocomposite material and its preparation method and application belong to the field of gas sensors and environmental monitoring technology. The present invention first mixes melamine and sodium bicarbonate into water, stirs them into a paste, dries them, and calcines them to obtain NaCO₃/Bulk‑C₃N₄. Then, Bulk‑C₃N₄ is peeled off by hydrothermal method, and two-dimensional sheet-like materials of g‑C₃N₄ are obtained after calcination. In situ chemical oxidation polymerization method is used to prepare PANI@g‑C₃N₄ ammonia gas sensing material, finally prepared by electrostatic self-assembly PANI@g‑C₃N₄ ammonia sensor. The present invention is prepared PANI@g‑C₃N₄ ammonia sensor has good gas sensing performance and responds well to low concentrations of ammonia at room temperature. The detection limit can reach 2ppm, and it has broad application prospects.