Highly Sensitive Acetone Gas Sensor Fe2O3/Nb2O5/Nb4C3Tx Based on MXene
MXene exhibits a high specific surface area and excellent electrical conductivity.Combined with metal oxide semiconductors,it can effectively prevent the agglomeration of lamellar structures and significantly enhance the carrier transfer rate,thereby enhancing gas-sensitive performance.Fe2O3/Nb2O5/Nb4C3Tx ternary composites were successfully synthesized using a straightforward two-step hydrothermal and calcination method.Fe2O3 microspheres were characterized to be distributed between the layers of MXene nanosheets.Gas-sensitive test results demonstrate a significant enhancement in the responsiveness of the Fe2O3/Nb2O5/Nb4C3Tx sensor to acetone compared to the pristine Fe2O3.The sensor exhibits high sensitivity,improved selectivity,and a strong response to 5×10-6 acetone(Ra/Rg=7.81,30％RH).Additionally,it demonstrates rapid response and recovery times,excellent reproducibility,and long-term stability.The excellent gas-sensitive performance of the Fe2O3/Nb2O5/Nb4C3Tx sensor can be attributed to the large specific surface area and abundant oxygen vacancies provided by the ternary composite material.These features enhance the availability of active sites,facilitating the diffusion of gases on the sensor surface,which provides valuable insights into the development of acetone-sensitive material composites.
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