Study On The Application Of Nanosecond Pulsed Plasma In The Preparation Of Iron And Carbon Nanoparticles

Nanotechnology which is the one of topical issues in the research and applied fields has aroused people’s great attention. Nanoparticle has lots of unique properties because of its surface effect, quantum effect, small size effect and so on. which is different from particle. Having excellent absorption and reducibility. iron and carbon nanoparticles have widespread applications in environmental protection, electronics, chemical, medical and so on.It’s difficult for traditional preparation method to apply nanopanicle due to low yields, high cost, long cycle and iow purity. Atmospnenc pressure non-equilioum piasma nas more active particles, low temperature and is easy to operate, but it’s difficult for plasma to prepare particles with small size now. which hampers the adoption of this technology in the material preparation and processing. Taking advantage of nanosecond pulse power, the following work is done in this paper:1. We discuss the effect of distance between the electrodes and pulse repetition rate to iron nanoparticles with plasma gas method and investigate the formation mechanism of nanoparticles. The plasma is generated by magnetic compression pulse power. A stainless tube is the powered electrode and Ar is the working gas. A insulated containers is added with a mixture of150mL lmmol/L ferrocene/ethanol solution. The effect of pulse repetition rate in the100-600Hz range on the iron nanoparticles is further investigated based on the electrical and spectroscopic diagnosis and SEM characterization. It is shown that the increase of pulse repetition rate in the range of300-600Hz exerts no significant influences on the size of nanoparticles that are in the range of30-40nm with a narrow size distribution. The distances change in the range of6.5-2.0" cm at constant frequency. It is found that the discharges appear in the electrode tip in the distances from6.5cm to5.0cm. While once the distance is less than4.0cm, the discharges become intense abruptly and the corresponding discharge parameters increase drastically, which results in the increase of nanoparticles in size.2. We discuss the effect of pulse peak voltage, gas flow rate, pulse width, processing time and pulse repetition rate to iron and carbon nanoparticles with plasma liquid method. An atmospheric pressure Ar plasma jet is generated by three in one pulse power and is designed with a concentric cylinder electrode.15ml FecVPVP/deionized water/ethanol and15ml ethanol/PVP solution are separately added to a landed stainless cup. That the proportion of ethanol and deionized water is1:1is the best. In addition, the high temperature of solution can result in the increase of iron nanoparticles in size. The effect of gas flow rate, pulse width, pulse repetition rate and peak voltage on the iron nanoparticles is further investigated based on SEM characterization. It is shown that these parameters exert no significant influences on the size of nanoparticles that are in the range of8-9nm with a narrow size distribution in our research. The effect of gas flow rate, pulse width, processing time, pulse repetition rate and peak voltage on the carbon nanoparticles is further investigated based on TEM characterization. It is shown that gas flow rate, pulse width, processing time and pulse repetition rate exert no significant influences on the size of nanoparticles in our research, but the increase of pulse peak voltage in the range of3.07-4.0kV exerts a little influence on the size of nanoparticles.