The emerging micro-nano-processing technologies have propelled significant advances in multifunctional systems that can perform multiple functions within a small volume through integration. Herein, we present an on-chip multifunctional system based on a 1T/2H-MoS₂/graphene fishnet tube, where a micro-supercapacitor and a gas sensor are integrated. A hybrid three-dimensional stereo nanostructure, including MoS₂ nanosheets and graphene fishnet tubes, provides K⁺ ions with a short diffusion pathway and more active sites. Owing to the large layer spacing of 1T-MoS₂ promoting fast reversible diffusion, the on-chip micro-supercapacitor exhibits excellent electrochemical properties, including an areal capacitance of 0.1 F·cm⁻² (1 mV·s⁻¹). The variation in the conductivity of 2H-MoS₂ when ammonia molecules are adsorbed as derived from the first-principles calculations proves the Fermi level-changes theory. Driven by a micro-supercapacitor, the responsivity of the gas sensor can reach 55.7% at room temperature (27 °C). The multifunctional system demonstrates the possibility of achieving a two-dimensional integrated system for wearable devices and wireless sensor networks in the future.

新兴的微纳处理技术推动了多功能系统的重大进步，这些多功能系统可以通过集成在很小的体积内执行多种功能。在这里，我们提出了一种基于1T / 2H-MoS ₂ /石墨烯鱼网管的芯片上多功能系统，其中集成了微型超级电容器和气体传感器。包括MoS ₂纳米片和石墨烯鱼网管的混合三维立体纳米结构为K ⁺离子提供了短扩散路径和更多活性位。由于1T-MoS ₂的较大层间距促进了快速可逆扩散，因此片上微型超级电容器具有出色的电化学性能，包括0.1 F·cm ^-2的面电容（1 mV·s ^-1）。由第一性原理计算得出，当吸附氨分子时2H-MoS ₂的电导率变化证明了费米能级变化理论。在微型超级电容器的驱动下，气体传感器在室温（27°C）下的响应率可达到55.7％。多功能系统展示了将来实现可穿戴设备和无线传感器网络的二维集成系统的可能性。