碳纳米管表面羧基对纳米RuO_2颗粒的分散作用

Effect of Surface Carboxyl Groups of Carbon Nanotubes on the Dispersion of RuO_2 Nanoparticles

采用硝酸氧化方法对多壁碳纳米管(CNT)的侧壁进行修饰,得到表面羧基含量可控的CNT,并进一步考察了碳管表面基团分布与纳米RuO2催化剂在CNT上的分散度及催化氧化活性之间的关系.以多齿羧酸配体作为稳定剂,合成了RuO2和IrO2纳米颗粒水溶胶,并通过改变配体的种类及数量对纳米颗粒团聚体粒径进行调控.研究结果表明,羧酸配体和碳管表面的羧基均有助于纳米氧化物颗粒的分散.

The distribution of surface oxygen-containing groups could be controlled by side-wall functionalization of multi-walled carbon nanotubes （CNT） using HNO3 solution. The dispersion and catalytic activity of nano-RuO2 catalyst depend on the surface carboxyl groups of CNT but had no correlation with hydroxyl and carbonyl groups. RuO2 and IrO2 nanoparticles were synthesized using polydentrate ligands as stabilizers. By changing the species and amounts of the ligands, the size of RuO2 and IrO2 nanoparticles could be adjusted. The carboxyl groups either from the ligands or from the CNT surfaces contribute to the dispersion of oxide nanocatalysts.