Hybridized 1T/2H-MoS_(2)/graphene fishnet tube for high-performance on-chip integrated micro-systems comprising supercapacitors and gas sensors

摘要

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-MoS_(2)/graphene fishnet tube,where a micro-supercapacitor and a gas sensor are integrated.A hybrid three-dimensional stereo nanostructure,including M0S_(2) nanosheets and graphene fishnet tubes,provides K^(+)ions with a short diffusion pathway and more active sites.Owing to the large layer spacing of IT-M0S_(2) 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-MoS_(2) 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.