弱磁化电容耦合等离子体中二氧化钛与碳质尘埃纳米颗粒的生长比较
Comparing growth of titania and carbonaceous dusty nanoparticles in weakly magnetised capacitively coupled plasmas
AI总结：
该研究对比有无500高斯弱磁场时电容耦合射频等离子体中二氧化钛与碳质尘埃纳米颗粒的生长周期和尘埃云分布，发现磁场加快生长周期、改变悬浮电位径向变化，推测两类尘埃云分布差异或源于磁场径向梯度。
摘要：
本研究对比了在存在及不存在约500高斯弱磁场的条件下，电容耦合射频等离子体中二氧化钛与碳质尘埃纳米颗粒的生长周期及尘埃云空间分布，讨论了关于周期时长、生长速率和尘埃云空间分布的研究结果。这类等离子体中的纳米颗粒生长具有周期性：颗粒达到最大尺寸后随即移出等离子体，随后开启新的颗粒生长周期。磁场的存在会加快两种等离子体中的生长周期，还会使两类尘埃云的空间分布产生差异。通过Langmuir探针测量背景等离子体参数（如电子温度和悬浮电位）发现，悬浮电位存在径向变化，而电子温度无径向变化；此外，磁场会改变悬浮电位的径向变化规律。但这些测量结果不足以解释两类尘埃云呈现不同形态的原因，这种差异可能由磁场径向分布的梯度导致。
英文摘要：
This study compares the growth cycles and spatial distribution of dust cloud for titania and carbonaceous dusty nanoparticles in capacitively coupled radiofrequency plasmas, with and without the presence of a weak magnetic field of approximately 500 Gauss. Findings on cycle time, growth rate, and spatial distribution of dust cloud are discussed. The growth of nanoparticles in these plasmas is cyclic, with particles reaching their maximum size and subsequently moving out of the plasma, followed by the generation of a new particle growth cycle. The presence of the magnetic field speeds up the growth cycle in both plasma. The magnetic field also makes the spatial distribution of the two dust cloud different from each other. Langmuir probe measurement of the background plasma parameters such as electron temperature and floating potential reveal radial variations in floating potential but not electron temperature. Furthermore, the magnetic field changes the radial variation of floating potential. These measurements, however, are not sufficient to explain why the two dust clouds appear differently. It is possible that the differences occur due to a gradient in the radial distribution of the magnetic field.
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