基于空心花球状Co3O4的二甲苯气体传感器OA

This study developed a high-performance gas sensor based on hollow flower-like Co3O4 for the detection of xylene.To overcome limitations of conventional p-type metal oxide semiconductors in terms of selectivity,sensitivity,and operating temperatures,this study synthesized a hierarchically porous hollow flower-like Co3O4 gas-sensitive material via a one-step hydrothermal approach,and systematically explored the correlation between its microstructure and gas-sensing performance.Gas-sensing evaluation revealed that the response value of this sensor to 10 mg/L xylene was 1.9 at an optimal operating temperature of 200℃,with a low baseline resistance of 4.4 kΩ.The device exhibited a favorable linear response in the range of 10-100 mg/L,with a detection limit of 10 mg/L.Moreover,the sensor demonstrated excellent repeatability and long-term stability,showing less than 5%response fluctuation over five consecutive testing cycles.Selectivity tests indicated a markedly higher response to xylene compared to common interfering gases such as benzene,toluene,and ethanol,confirming its superior discriminative capability.The superior gas-sensing performance is attributed to its unique hollow flower-like architecture.Its hierarchical porosity provides a large specific surface area for gas interaction,facilitates efficient diffusion,and enhances both surface charge distribution and gas-solid interactions.This work not only provides a structurally controllable and easily fabricated sensor for high-performance xylene detection,but also provides valuable design principles for developing advanced gas-sensitive materials suited for complex environmental monitoring applications.