Gas sensors for ammonia (NH3) play a crucial role in the maintenance of air quality, preservation of the atmosphere, and evaluation of human health. However, the endeavor to attain a high level of sensitivity in detecting NH3 under ambient conditions remains a challenging task. In this work, poly(3‐hexylthiophene)s and titanium dioxide (P3HT‐TiO2) heterostructure NH3 gas‐sensitive material was prepared, and by drop‐casting the material onto a substrate with Au interdigital electrodes, a sensor for high‐response detection of NH3 at room temperature was constructed. The designed gas sensor exhibited a high response signal of 114.61% toward 15 ppm NH3 at room temperature (25°C) with good reproducibility, strong long‐term stability, and excellent selectivity. Moreover, by analyzing the response law of the sensor under different humidity conditions, it has been noted that both excessively high and excessively low levels of humidity adversely affect the sensor’s response. The remarkable increase in NH3 sensing properties is attributed to the synergistic enhancement effect of P‐N heterojunction formed between P3HT and TiO2. This NH3 gas sensor exhibits tremendous potential for use due to its straightforward structure and outstanding ammonia sensing performance.

中文翻译：

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聚3己基噻吩二氧化钛（P3HT-TiO2）复合传感器用于室温下氨的高响应检测

氨 (NH3) 气体传感器在维持空气质量、保护大气和评估人类健康方面发挥着至关重要的作用。然而，在环境条件下达到高灵敏度检测 NH3 的努力仍然是一项具有挑战性的任务。在这项工作中，制备了聚（3-己基噻吩）和二氧化钛（P3HT-TiO2）异质结构NH3气敏材料，并将该材料滴铸到带有Au叉指电极的基板上，形成了用于高分辨率检测的传感器构建了室温下的NH3。所设计的气体传感器在室温（25°C）下对15 ppm NH3表现出114.61%的高响应信号，具有良好的重现性、强的长期稳定性和优异的选择性。此外，通过分析传感器在不同湿度条件下的响应规律，发现湿度过高和过低都会对传感器的响应产生不利影响。 NH3传感性能的显着提高归因于P3HT和TiO2之间形成的P-N异质结的协同增强效应。该 NH3 气体传感器因其简单的结构和出色的氨传感性能而展现出巨大的应用潜力。