【摘要】 采用溶胶-凝胶法制备三氧化钨(WO3)纳米粉体,然后在WO3粉体中添加碳纳米管(CNT),经热处理形成CNT-WO3气敏材料。用SEM观察CNT的分布形态和CNT-WO3材料的显微结构,研究超声振荡对CNT的分散效果,测量了CNT-WO3材料的气敏性能。结果表明,100 W功率下超声振荡使原先团聚严重的CNT得到分散,添加量为0.4 wt%的CNT存在于粒径为30～50 nm的WO3粉体颗粒之间,增加了气敏材料的气孔率并且降低了电阻率,对丙酮气体的灵敏度有明显提高。更多还原

【Abstract】 The tungsten trioxide(WO3) nano-powders are prepared by sol-gel technique,and then add carbon nanotubes(CNT) to obtain CNT-WO3 gas-sensing material.The microstructure of carbon nanotubes and gas-sensing material was observed by SEM,the distribution shape of carbon nanotubes in gas sensing materials CNT-WO3 was researched.The measure results showed that,under 100W power ultrasonic oscillation,the carbon nanotubes which swarm originally were dispersed.The 0.4wt.% carbon nanotubes,existing between WO3 grains with size of 30-50nm,increase the material porosity,and reduce the resistance of WO3 gas-sensing material significantly,then improve the sensitivity to acetone gas.更多还原