(西北工业大学 材料科学与工程学院，西安 710072)
摘 要: 采用混酸法制备羧基化多壁碳纳米管以及采用超声凝聚法制备壳聚糖纳米粒子，再通过静电自组装的方法制备碳纳米管/壳聚糖(相对分子质量(Mr)不小于5万和不小于10万)、碳纳米管/高密度壳聚糖、碳纳米管/羧化壳聚糖、多壁碳纳米管/壳聚糖盐酸盐复合材料。通过SEM、HRTEM及XRD对产品进行微观结构分析，利用循环伏安法对H2O2在碳纳米管/壳聚糖修饰电极上的电化学行为进行研究。结果表明：壳聚糖盐酸盐对碳纳米管具有较好的包覆效果，包覆层厚度约为3.5 nm，静置12 h后具有良好的溶液分散性；碳纳米管/壳聚糖盐酸盐修饰玻碳电极改善了H2O2的氧化还原电流，同时还降低了H2O2的氧化还原的过电势，对其电化学催化性能具有良好的促进作用。
关键字: 多壁碳纳米管；壳聚糖；静电自组装；电催化性能
multi-walled carbon nanotubes/chitosan composites
（School of Materials and Engineering Science, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:Functionalized multi-walled carbon nanotubes(f-MWCNTs) were prepared by mixed acids. And chitosan(CS) nanoparticles were prepared by precipitation methods. MWCNTs/CS (Mr≥50 000 and Mr≥100 000), MWCNTs/super high density CS, MWCNTs/CS hydrochloride and MWCNTs/carboxylation CS nanocomposites were synthesized by electrostatic self-assembly. The microstructures of MWCNTs/CS composites were analyzed by means of SEM, HRTEM and XRD. The electrochemical properties of H2O2 decorated with MWCNTs/CS hydrochloride composites glass-carbon electrode were tested by cyclic voltammetry. The results indicate that MWCNTs/CS hydrochloride composite possesses the best coating effects and the dispersion after standing for 12 h. The thickness of CS grafted on the surface of MWCNTs is about 3.5 nm. MWCNTs hydrochloride composite glass-carbon electrode improves the current and decreases the overpotential of H2O2 redox. The modified electrode displays good stability and reproducibility.
Key words: multi-walled carbon nanotubes(MWCNTs); chitosan(CS); electrostatic self-assembly; electrocatalytic property
