Measurement of sub-2 nm stable clusters during silane pyrolysis in a furnace aerosol reactor.
Measurement of sub-2 nm stable clusters during silane pyrolysis in a furnace aerosol reactor.
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DOI：
10.1063/1.5124996
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
Miguel Vazquez-Pufleau;Yang Wang;P. Biswas;E. Thimsen
中科院分区：
文献类型：
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作者：
Miguel Vazquez-Pufleau;Yang Wang;P. Biswas;E. Thimsen
颗粒形成的初始阶段在一些工业和环境系统中是重要的;然而，由于无法测量团簇尺寸分布，该现象尚未完全理解。采用高分辨率微分迁移率分析仪和静电计对SiH 4在气溶胶反应器中热解形成Si颗粒的早期阶段进行了研究。我们第一次从硅烷热解中检测到亚纳米级的稳定团簇，直径约为0.7 nm。该直径在所报道的临界硅烷簇族基于其实际分子结构可能具有的可能尺寸范围内。负团簇的大小分布也被绘制出来。此外，气相色谱质谱，和透射电子显微镜表征的集群和初级粒子被用来评估其在气溶胶动力学的粒子形成的初始阶段的机械作用。
The initial stages of particle formation are important in several industrial and environmental systems; however, the phenomenon is not completely understood due to the inability to measure cluster size distributions. A high resolution differential mobility analyzer with an electrometer was used to map out the early stages of Si particle formation from pyrolysis of SiH4 in a furnace aerosol reactor. We detected for the first time subnanometer stable clusters from silane pyrolysis, and the diameter was measured to be about 0.7 nm. This diameter is within the range of probable sizes that the reported families of critical silane clusters could have based on their actual molecular structure. The size distributions of negative clusters are also mapped out. In addition, gas chromatography mass spectrometry, and transmission electron microscopy characterizations of the clusters and primary particles are used to assess their mechanistic roles in aerosol dynamics of the initial stages of particle formation.