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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Requirements for plasma synthesis of nanocrystals at atmospheric pressures
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Requirements for plasma synthesis of nanocrystals at atmospheric pressures

机译：大气压下等离子体合成纳米晶体的要求

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摘要

While well-defined high quality semiconductor nanocrystals have been synthesized successfully in low pressure nonthermal plasmas, moving the field of plasma nanoparticle synthesis to atmospheric pressures is important for lowering its cost and making the process attractive for some industrial applications. Here we present a heating and charging model for silicon nanoparticles during their synthesis in plasmas maintained over a wide range of pressures (10 - 10(5) Pa). We consider three collisionality regimes and determine the dominant contribution of each regime to heating and charging of nanoparticles under various plasma conditions. For plasmas maintained at atmospheric pressures we find that the ion current is mainly due to the collisional hydrodynamic contribution. Based on the model, we predict that the formation of nanocrystals at atmospheric pressure requires significantly higher plasma densities than those at low pressures. Strong nanoparticle cooling at atmospheric pressures necessitates high ion densities to reach temperatures required for crystallization of nanoparticles. Using experimentally determined plasma properties from the literature we estimate the nanoparticle temperature that can be achieved during synthesis at atmospheric pressures and predict that temperatures well above those required for crystallization can be achieved. Based on these results we suggest design principles for nanocrystal synthesis at atmospheric pressures.
机译：尽管已经在低压非热等离子体中成功合成了定义良好的高质量半导体纳米晶体，但将等离子体纳米颗粒合成领域转移到大气压下对于降低其成本并使该方法对某些工业应用具有吸引力非常重要。在这里，我们介绍了硅纳米颗粒在等离子体合成过程中的加热和充电模型，这些等离子体保持在很宽的压力范围（10-10（5）Pa）下。我们考虑了三种碰撞方式，并确定了每种方式在各种等离子体条件下对纳米颗粒加热和充电的主要作用。对于保持在大气压下的等离子体，我们发现离子电流主要归因于碰撞流体动力作用。基于该模型，我们预测在大气压下形成纳米晶体需要比在低压下显着更高的等离子体密度。在大气压力下强烈的纳米颗粒冷却需要高的离子密度才能达到纳米颗粒结晶所需的温度。利用文献中实验确定的等离子体特性，我们估算了在大气压力下合成过程中可以达到的纳米粒子温度，并预测可以达到远高于结晶所需的温度。基于这些结果，我们建议在大气压下合成纳米晶体的设计原理。

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