Facile Fabrication of MoS₂‑Modified\nSnO₂ Hybrid Nanocomposite for Ultrasensitive Humidity Sensing

Abstract

An\nultrasensitive humidity sensor based on molybdenum-disulfide-\n(MoS₂)-modified tin oxide (SnO₂) nanocomposite\nhas been demonstrated in this work. The nanostructural, morphological,\nand compositional properties of an as-prepared MoS₂/SnO₂ nanocomposite were characterized by scanning electron microscopy\n(SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD),\nenergy dispersive spectrometry (EDS), nitrogen sorption analysis,\nand Raman spectroscopy, which confirmed its successful preparation\nand rationality. The sensing characteristics of the MoS₂/SnO₂ hybrid film device against relative humidity (RH)\nwere investigated at room temperature. The RH sensing results revealed\nan unprecedented response, ultrafast response/recovery behaviors,\nand outstanding repeatability. To our knowledge, the sensor response\nyielded in this work was tens of times higher than that of the existing\nhumidity sensors. Moreover, the MoS₂/SnO₂ hybrid\nnanocomposite film sensor exhibited great enhancement in humidity\nsensing performances as compared to the pure MoS₂, SnO₂, and graphene counterparts. Furthermore, complex impedance\nspectroscopy and bode plots were employed to understand the underlying\nsensing mechanisms of the MoS₂/SnO₂ nanocomposite\ntoward humidity. The synthesized MoS₂/SnO₂ hybrid\ncomposite was proved to be an excellent candidate for constructing\nultrahigh-performance humidity sensor toward various applications.