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Diamond-like-carbon nanoparticle production and agglomeration following UV multi-photon excitation of static naphthalene/helium gas mixtures
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Date
2016-07-11
Authors
Walsh, Anton J.
Tielens, A. G. G. M.
Ruth, Albert A.
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Publisher
AIP Publishing
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Abstract
We report the formation of nanoparticles with significant diamond character after UV multi-photon laser excitation of gaseous naphthalene, buffered in static helium gas, at room temperature. The nanoparticles are identified in situ by their absorption and scattering spectra between 400 and 850 nm, which are modeled using Mie theory. Comparisons of the particles’ spectroscopic and optical properties with those of carbonaceous materials indicate a sp3/sp2 hybridization ratio of 8:1 of the particles formed. The particle extinction in the closed static (unstirred) gas-phase system exhibits a complex and quasi-oscillatory time dependence for the duration of up to several hours with periods ranging from seconds to many minutes. The extinction dynamics of the system is based on a combination of transport features and particle interaction, predominantly agglomeration. The relatively long period of agglomeration allows for a unique analysis of the agglomeration process of diamond-like carbon nanoparticles in situ.
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Keywords
Diamond-like carbon , Nanofabrication , Nanoparticles , Refractive index , Aromatic-hydrocarbon cations , Optical-properties , Detonation nanodiamond , Wavelength dependence , Amorphous-carbon , Graphite , Delivery , Phase , Soot , Fragmentation
Citation
Walsh, A. J., Tielens, A. G. G. M. and Ruth, A. A. (2016) 'Diamond-like-carbon nanoparticle production and agglomeration following UV multi-photon excitation of static naphthalene/helium gas mixtures', The Journal of Chemical Physics, 145(2), 024303 (12 pp). doi:10.1063/1.4955192
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© 2016, AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in J. Chem. Phys. 145, 024303 (2016) and may be found at http://aip.scitation.org/doi/abs/10.1063/1.4955192