溶胶-凝胶法制备碳纳米管/ZnO纳米复合材料及其氨敏性研究

The synthesis of CNT/ZnO nanocomposite by sol-gel method and its NH_3 sensitive properties

以碳纳米管为模板,采用溶胶-凝胶法合成了碳纳米管（CNT）/ZnO纳米复合材料,用XRD、TEM、IR和EDS对产物进行了表征,研究了用该材料制成的气敏元件在室温下对NH3的气敏性。结果表明,产物是由ZnO均匀包裹在碳纳米管上构成的一种纳米复合材料,管径约50~60nm。这种复合材料可大大降低元件的阻值,提高元件的灵敏度。当碳纳米管加入量为60%[与Zn（CH3COO）2.2H2O的摩尔比]时,元件灵敏度最大,且灵敏度随NH3浓度的增大而增大,NH2从100ppm（10-6）以后,灵敏度变化平缓。

CNT/ZnO nanocomposite was synthesized by sol-gel method.The samples were characterized by XRD,TEM,IR and EDS.The NH3 sensitive performance of the sensors made from CNT/ZnO nanocomposite was studied at room temperature.The results showed that nanocomposite was composed of carbon nanotubes coated evenly by ZnO,with a diameter of 50~60nm.The NH3 gas sensitivity of the CNT/ZnO nanocomposite was far higher than that of pure ZnO sensor and the 60%（mol）carbon nanotube added sensor had the highest sensitivity.The sensitivity of sensor increased with NH3 concentration increasing.When NH3 concentration was higher than 100ppm,the sensitivity of sensor was almost constant.