Study On Preparation Of Nano-metal Sols By Pulsed Laser Ablation And Catalytic Growth Of One-dimension Carbon Nano-materials

A new method for successive preparation of nano-metal sols by pulsed laser ablation at the interface of gas, solid and flow-liquid is developed. This method has two advantages: successive preparation and broad applicability.Nano-metal/ethanol sols, including Fe, Co, Ni, Au, Ti and W, were successfully obtained by this method. The diameters of metal particles in the sols were between 10~30nm. Especially, the nano-iron and nano-tungsten sols as well as their powders were characterized in detail by XRD, FT-IR, UV-Vis, XFS, TEM, SEM, EDAX and so on.Another new method is put forward firstly to estimate the addition of dispersants and its effect by UV-Vis. The relation of absorption of nano-metal sols and the addition of dispersants, as well as the rule of absorption of nano-metal sol added by dispersants concomitant to placing time were systematically investigated by means of UV-Vis. The results show that, the suitable dispersant to nano-iron/ethanol sol is 0.035% polyoxyethylene(10) lauryl ether(OP-10), but in the case of nano-tungsten/ethanol sol, 0.13% neotelex maybe is of more benefit to its disperse stability. The observation of TEM shows the best evidences. This result is instructional to find out effective dispersants for particular nano-particles.Using nano-iron and nano-tungsten as catalyzers, we try to produce carbon nanotube or nanostring by CVD and PLA. The results show that one-dimension carbon nanomaterials can be successfully obtained by CVD only based quartz module. While if pulse laser ablation is applied, the output of mixed target is obviously more than that of plumbago target. The carbon nanotubes prepared by nano-tungsten catalyzer are very straight without any bent and their diameters are under 10nm. It is worth to pay more attention and need to study further .