论文标题
通过富含硼的靶标的激光燃料来表征血浆纳米材料合成过程中等离子体和气相化学的表征
Characterization of plasma and gas-phase chemistry during boron-nitride nanomaterial synthesis by laser-ablation of boron-rich targets
论文作者
论文摘要
在这项工作中，由硼和硝酸硼（BN）材料制成的固体靶标被纳秒脉冲激光在氮气和氦气的亚大气压压力下消融。用空间分辨的光学发射光谱（OES）探测了来自目标的消融羽流中的激发物种。血浆羽流中化学成分的评估表明，对于两个富含硼的靶标，在富含氮的环境中始终观察到BN分子的发射。此外，当在氦气中消除氮化硼靶时，BN分子也存在 - 这表明羽流中的Bn分子可能来自固体靶标。此外，无论压力和周围的气体如何，BN目标的消融具有B2N分子的发射。这些结果表明，BN靶标的消融对含有硼和氮种的复杂分子的产生更有利，并且可能暗示BN对高产BN纳米材料合成的原料也更有利。还研究了这项工作中的等离子体参数，例如电子温度（峰值为1.3 eV）和密度（峰值为2x10^18 cm^-3），以便讨论羽流中的化学动力学。
In this work, solid targets made from boron and boron nitride (BN) materials are ablated by a nanosecond pulsed laser at sub-atmospheric pressures of nitrogen and helium gases. Excited species in the ablation plume from the target are probed with spatiotemporally resolved optical emission spectroscopy (OES). Evaluation of chemical composition in the plasma plume revealed that for both boron-rich targets, emission from BN molecules is always observed in nitrogen-rich environments. In addition, BN molecules also present when ablating a boron nitride target in helium gas -- an indication that BN molecules in the plume may originate from the solid target. Furthermore, the ablation of BN target features emission of B2N molecules, regardless of the pressure and surrounding gas. These results suggest that the ablation of the BN target is more favorable for the generation of complex molecules containing boron and nitrogen species and possibly hint that BN is also more favorable feedstock for high-yield BN nanomaterial synthesis. Plasma parameters such as electron temperature (peak value of 1.3 eV) and density (peak value of 2x10^18 cm^-3) were also investigated in this work in order to discuss the chemical dynamics in the plume.
