Smart sensing devices with high reliability and self-powered features are critical in future generation wearable applications. In this paper, we reported for the first time a room temperature Au-MoSe₂ composite ammonia (NH₃) sensor driven by a novel flexible piezoelectric nanogenerator (PENG) based on two-dimensional (2D) semiconductor MoS₂ flake. Moreover, we also demonstrated the MoS₂-based PENG device attached to the human body for harvesting diverse body motion energy, demonstrating its strong potential for applications in wearable devices. A series of characterizations of 2D piezoelectric semiconductor MoS₂ and Au-MoSe₂ sensing materials were carried out. The Au-MoSe₂ composite-based ammonia sensor with MoS₂ PENG showed a higher response (V_a/V_g = 29 @ 100 ppm NH₃) toward NH₃ than that of MoSe₂ counterpart (V_a/V_g = 25 @ 100 ppm NH₃). And it has superior selectivity and outstanding long-term stability. Moreover, the sensor also has a fast response/recovery time (18 s/16 s) towards 20 ppm NH₃. Finally, the enhanced sensing mechanism of Au-MoSe₂ composite toward NH₃ was discussed by using first-principle calculations based on density functional theory.

具有高可靠性和自供电功能的智能传感设备在下一代可穿戴应用中至关重要。在本文中，我们首次报道了一种基于二维（2D）半导体MoS ₂薄片的新型柔性压电纳米发电机（PENG）驱动的室温Au-MoSe ₂复合氨（NH ₃）传感器。此外，我们还演示了连接到人体的基于MoS ₂的PENG设备，该设备用于收集各种人体运动能量，证明了其在可穿戴设备中的强大应用潜力。对2D压电半导体MoS ₂和Au-MoSe ₂传感材料进行了一系列表征。金钼具有MoS ₂ PENG的₂复合材料型氨传感器显示出对NH ₃更高的响应（V _a / V _g  = 29 @ 100 ppm NH ₃），而与MoSe ₂对应物相比（V _a / V _g  = 25 @ 100 ppm NH _3））。而且它具有出色的选择性和出色的长期稳定性。此外，传感器还具有对20 ppm NH ₃的快速响应/恢复时间（18 s / 16 s）。最后，通过基于密度泛函理论的第一性原理计算，探讨了Au-MoSe ₂复合材料对NH ₃的增强传感机理。