Flexible impedance sensor based on Ti ₃ C ₂ T _<i>x</i> MXene and graphitic carbon nitride nanohybrid for humidity‐sensing application with ultrahigh response

Abstract

Abstract This paper reported the impedance‐type humidity sensor based on Ti 3 C 2 T x /g‐C 3 N 4 nanomaterials 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 Ti 3 C 2 T x and g‐C 3 N 4 nanomaterials. The performance of the humidity sensor was tested at room temperature. The experimental results showed that the Ti 3 C 2 T x nanosheets with g‐C 3 N 4 nanosheets 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 Ti 3 C 2 T x /g‐C 3 N 4 humidity sensor. The Ti 3 C 2 T x /g‐C 3 N 4 humidity sensor can monitor skin humidity and high‐humidity alarm, which demonstrates great potential applications in various fields.