Flexible impedance sensor based on Ti3C2Tx MXene and graphitic carbon nitride nanohybrid for humidity-sensing application with ultrahigh response

This paper reported the impedance-type humidity sensor based on Ti3C2Tx/g-C3N4nanomaterials which was fabricated on a flexible polyethylene terephthalate(PET) substrate.The scanning electron microscopy(SEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS) measurements were used to demonstrate the successful synthesis and combination of Ti3C2Txand g-C3N4nanomaterials.The performance of the humidity sensor was tested at room temperature.The experimental results showed that the Ti3C2Txnanosheets with g-C3N4nanosheets endowed the humidity sensor with an ultra-high response,rapid response/recovery time,and negligible hysteresis.The complex impedance spectroscopy(CIS) and bode diagrams were used to further analyze the sensing mechanism of the Ti3C2Tx/g-C3N4humidity sensor.The Ti3C2Tx/g-C3N4humidity sensor can monitor skin humidity and high-humidity alarm,which demonstrates great potential applications in various fields.