论文部分内容阅读
借助原位还原法,成功地将铂纳米粒子负载在一种具有微管簇形貌的植物载体—剑麻纤维中,负载的铂纳米粒子的平均粒径约为3.6nm。通过在400℃下碳化这种含有铂纳米粒子的剑麻纤维,得到铂纳米粒子/碳纤维复合材料,这种碳纤维保留了原来剑麻纤维的微管簇形貌。剑麻纤维中相邻的微管壁和它们所夹的胞间层在碳化反应之后,融为一体,变成了均一的碳微管壁。虽然碳化后铂纳米粒子的平均粒径增大到5.3nm左右,但是生成的载体碳纤维还是有效地阻止了铂纳米粒子的生长。这种铂纳米粒子/碳纤维复合材料兼具微管簇结构、碳纤维载体和活性铂纳米粒子的优点,很可能成为一种新型的异相催化剂,在很多领域中具有开发前景。
Platinum nanoparticles were successfully loaded on sisal fiber, a kind of plant carrier with microtubule morphology, by means of in situ reduction method. The average diameter of platinum nanoparticles loaded was about 3.6 nm. Platinum nanoparticle / carbon fiber composites were obtained by carbonizing the sisal fibers containing platinum nanoparticles at 400 ° C. The carbon fibers retained the microtubule morphology of the original sisal fibers. The adjacent microtubule walls in the sisal fiber and the intercellular spaces they sandwich after carbonization combine to become a uniform carbon microtubule wall. Although the average particle size of the carbonized platinum nanoparticles is increased to about 5.3 nm, the generated carrier carbon fibers effectively prevent the growth of the platinum nanoparticles. This platinum nanoparticle / carbon fiber composite has the advantages of microtubule structure, carbon fiber carrier and active platinum nanoparticles and is likely to become a new heterogeneous catalyst with promising development prospects in many fields.