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.
M. Vazquez-Pufleau et al., "Measurement of Sub-2 Nm Stable Clusters during Silane Pyrolysis in a Furnace Aerosol Reactor," Journal of Chemical Physics, vol. 152, no. 2, American Institute of Physics (AIP), Jan 2020.
The definitive version is available at https://doi.org/10.1063/1.5124996
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Aerosols; High resolution transmission electron microscopy; Mass spectrometry; Pyrolysis; Size distribution, Aerosol dynamics; Cluster-size distribution; Differential mobility analyzers; Environmental systems; Gas chromatography-mass spectrometry; High resolution; Particle formations; Primary particles, Gas chromatography
International Standard Serial Number (ISSN)
Article - Journal
© 2020 The Authors, All rights reserved.
01 Jan 2020