爆炸辅助气相沉积法制备炭纳米线的研究

Fabrication of carbon nanowires by detonation-assisted chemical vapor deposition

根据爆炸辅助气相沉积法生长碳纳米管的机理,设计了两种制备炭纳米线的方案:(1)使用低活性铁-镍二元金属催化剂;(2)对钴催化剂作用下碳纳米管的生长实施冷冻。透射电子显微镜显示这两种方法制备的炭纳米线均为纳米颗粒组装而成,具有非常粗糙的表面。其中,使用铁-镍二元催化剂所制炭纳米线直径分布不均匀,黏结情况严重;而在冷冻钴催化剂作用下炭纳米管生长过程所得的炭纳米线直径分布比较均匀,黏结情况也大为减少。这两种纳米线的差别与金属催化剂的活性有关。光催化降解亚甲基蓝实验表明:冷冻碳纳米管生长所得炭纳米线具有良好的催化辅助功能,可以提高ZnS纳米晶的光催化活性。

High yield carbon nanowires were fabricated by a detonation-assisted chemical vapor deposition approach, using low activity iron-nickel as catalyst or a cobalt catalyst to freeze the growth process of carbon nanotubes. TEM observations indicated that the two kinds of carbon nanowires had rough surfaces. Compared with the nanowires obtained from the iron-nickel catalyst, the products obtained from the cobalt catalyst had uniform diameter and were less coalesced. The difference should be associated with the activity of the metal catalysts. Methylene blue degradation experiments showed that the latter carbon nanowires can enhance the photocatalysis activity of ZnS nanocrystals.