Influence of the bath gas on the condensation of supersaturated iron atom vapour at room temperature
Influence of the bath gas on the condensation of supersaturated iron atom vapour at room temperature
复制标题
浴气对过饱和铁原子蒸气室温冷凝的影响
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
C. Schulz
中科院分区：
文献类型：
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作者：
A. Eremin;E. Gurentsov;C. Schulz
实验研究了浴气种类和压力对纳米铁颗粒形成和生长的影响。以ArF准分子激光脉冲光解Fe(CO)5气体产生的过饱和铁蒸汽为原料，在室温下合成了纳米铁颗粒。在不同的实验条件下，用时间分辨激光诱导白炽法测定了光解后纳米粒子的粒径。此外，还对最终颗粒进行了取样，并用透射电子显微镜和能量色散X射线分析对其进行了分析。颗粒生长速率和最终颗粒尺寸取决于浴气组成和压力。提高氩浴气体压力加快了纳米铁颗粒的生长速度。与Ar相比，氦对颗粒生长速度没有影响。实验结果与基于前人建立的模型的颗粒表面生长的数值模拟结果进行了比较。模拟结果表明，浴气对粒子形成影响的差异是由于浴气对活性原子-粒子络合物的猝灭几率与物种有关。
The influence of the kind of bath gas and its pressure on the iron nanoparticle formation and growth was investigated experimentally. Iron nanoparticles were synthesized from supersaturated iron vapour generated by ArF excimer laser pulse photolysis of gaseous Fe(CO)5 at room temperature. The particle size was determined by time-resolved laser-induced incandescence (TiRe-LII) as a function of time after photolysis at different experimental conditions. Additionally, final particles were sampled and analysed by transmission electron microscopy and by energy-dispersive x-ray analysis. The particle growth rate and the final particle size depended on the bath-gas composition and pressure. Increasing the argon bath-gas pressure accelerated the iron nanoparticle growth rate. In contrast to argon, no influence of helium on the particle growth rate was observed. The experimental results are compared with numerical simulations of particle surface growth, based on the model developed in previous investigations. The simulations indicate that the observed differences in the influence of the bath gas on the particle formation are caused by the species-dependent quenching probability of the active atom-particle complexes by the bath gas.