Fabrication And Performance Characterization Of Carbon Nanotube/SNO2 Flexible Gas Sensor

Gas sensors as the detection of gas components,has been widely used in industrial production and daily life.With the continuous studying of research workers,gas sensors show a diversified,multi-disciplinary cross-development trend.In recent years,intelligent textiles become a hot research topic in the forefront field of textile technologies.Developing more smart textiles has become a competitive field in international clothing market.Gas sensors based on flexible substrates have attracted much attention because of their characteristics of light,cheap,flexible,winding and large area production.In China,every year as a result of alcohol traffic accidents caused by tens of thousands.Therefore,it is necessary to install a flexible gas sensor that can automatically identify whether the driver',s alcohol content is excessive.Two-dimensional and three-dimensional MWCNTs/SnO₂ composite gas-sensing materials were prepared by electrostatic enhanced ultrasonic atomization pyrolysis and hard template method,respectively,using oxygen plasma-modified MWCNTs and SnCl₄·5H₂O as raw materials.On the basis of this,the prototype of the flexible gas sensor was fabricated by impregnation-drying method with 1+1 rib as the substrate.The test results show that:oxygen plasma-treated carbon nanotubes effectively grafted oxygen-containing functional groups,significantly increased the sensitivity of composite sensitive materials,in gas-sensing properties of two-dimensional MWCNTs/SnO₂ sensitive materials,gas-sensing properties were improved obviously when the deposition temperature was 300? and the amount of doped MWCNTs is 10mg/mL,In the gas-sensing properties of three-dimensional MWCNTs/SnO₂ hollow-sphere composites,the response-recovery time of MWCNTs/SnO₂ hollow-ball composites was shortened,the response time was only ₄s and the recovery time was 20s,in the gas-sensing performance test of the flexible gas sensor,when the immersion time is 2.5h,the gas-sensing property reaches the optimum state.The results show that the modified carbon nanotubes and tin dioxide composites have good gas-sensing properties,and the successful preparation of flexible gas-sensing devices has laid a practical and theoretical basis for the preparation of smart flexible gas sensors.