论文标题
面向等离子体的微粒表面上的量子点：热平衡
Quantum dot on a plasma-facing microparticle surface: Thermal balance
论文作者
论文摘要
已知半导体纳米晶体（量子点）表现出量子限制的Stark效应，该效应在其光致发光光谱的转移中响应外部电场而揭示了自己。因此，有人提出使用沉积在微颗粒表面上的量子点来对低温等离子体中微粒获得的电荷进行光学测量。在这项工作中考虑了位于浸入血浆中的微粒表面上的量子点的热平衡。显示出典型的等离子参数，在定期脉冲的血浆条件下，由于其温度振荡引起的量子点的光致发光光谱移动在表征量子点与微粒和微粒之间的热接触的有效热接触时无法检测到量子点的光发光。在这些条件下，在血浆脉冲期间观察到的整个光谱移位应归因于由于微粒电荷引起的量子限制的鲜明效应。量子点和微粒之间直接接触的有效热通量的下频估计为$ \ sim 10^{12} $ 〜S $^{ - 1} $。
Semiconductor nanocrystals, quantum dots, are known to exhibit the quantum-confined Stark effect which reveals itself in the shift of their photoluminescence spectra in response to external electric field. It was, therefore, proposed to use quantum dots deposited on the microparticle surface for the optical measurement of the charge acquired by the microparticles in low-temperature plasmas. Thermal balance of a quantum dot residing on the surface of a microparticle immersed in a plasma is considered in this work. It is shown for typical plasma parameters that under periodically pulsed plasma conditions, the spectral shift of the photoluminescence of the quantum dot caused by the oscillations of its temperature becomes undetectable at the effective thermal flux characterizing the thermal contact between the quantum dot and the microparticle $\sim 10^9$~s$^{-1}$. Under these conditions, the entire spectral shift observed during the period of plasma pulsing should be attributed to the quantum-confined Stark effect due to the microparticle charge. Lower-boundary estimate for the effective thermal flux for the direct contact between the quantum dot and the microparticle is $\sim 10^{12}$~s$^{-1}$.
