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首页> 外文期刊>Plasma Sources Science & Technology >Langmuir probe characterisation of an Ar–H2 non-thermal plasma loaded with carbon nanoparticles
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Langmuir probe characterisation of an Ar–H2 non-thermal plasma loaded with carbon nanoparticles

机译：Langmuir探针表征碳纳米粒子的Ar-H2非热等离子体的表征

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摘要

In this contribution, we describe the development of a test-bed for the characterisation of non-thermal dusty plasmas via Langmuir probe. This technique, while allowing the precise determination of plasma parameters and electron energy distribution function (EEDF), is notoriously difficult to apply in dust-forming chemistries. We overcome this limitation by utilising a two-plasmas system in which the particle precursor, in this case acetylene, is fully consumed and converted into nanoparticles in a first plasma reactor, followed by the injection of the dust into a second plasma reactor where the Langmuir probe measurement is performed. This approach allows studying the influence of the variation of process parameters on the dusty plasma properties, all while leaving the nucleation and growth phase of the particles unaffected and fully decoupled from the discharge in which the measurement takes place. We have applied this approach to the case of graphitic carbon nanoparticles dispersed in an argon–hydrogen mixture. We have monitored the quality of the Langmuir probe measurement, and found that it is minimally affected by the presence of the graphitic particles even after several EEDF measurements. Our measurements confirm the unipolar charging of nanoparticles in non-thermal plasmas, consistent with previous observations and theoretical predictions. We also observe an unexpected trend with plasma input power: the charge carried by the particles does not monotonically increase with increased power, instead starts decreasing at sufficiently high input power levels.
机译：在这一贡献中，我们描述了通过Langmuir探针表征非热尘密等离子体的测试床的开发。这种技术，同时允许精确地确定等离子体参数和电子能量分配功能（EEDF），难以施加灰尘形成化学品。我们通过利用其中颗粒前体在这种情况下，在这种情况下将颗粒前体完全消耗并转化为第一等离子体反应器中的纳米颗粒，然后将灰尘注入朗米尔的第二等离子体反应器中进行探测测量。这种方法允许研究过程参数变异对尘土尘血浆性质的影响，同时留下颗粒的成核和生长阶段，不受影响并完全与测量发生的放电去耦。我们已经将这种方法应用于分散在氩气混合物中的石墨碳纳米粒子的情况。我们监测了Langmuir探针测量的质量，并且发现即使在几次EEDF测量后，它也可以通过石墨颗粒的存在。我们的测量确认了纳米颗粒在非热等离子体中的单极充电，与先前的观察和理论预测一致。我们还观察到等离子体输入功率的意外趋势：粒子承载的电荷不会随着功率增加而单调地增加，而是在足够高的输入功率水平上开始减小。

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