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Diamond-like-carbon nanoparticle production and agglomeration following UV multi-photon excitation of static naphthalene/helium gas mixtures
Walsh, Anton J.; Tielens, A. G. G. M.; Ruth, Albert A.
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.
Keyword(s): Diamond-like carbon; Nanofabrication; Nanoparticles; Refractive index; Aromatic-hydrocarbon cations; Optical-properties; Detonation nanodiamond; Wavelength dependence; Amorphous-carbon; Graphite; Delivery; Phase; Soot; Fragmentation
Publication Date:
2016
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University College Cork
Funder(s): Enterprise Ireland; Science Foundation Ireland
Citation(s): 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
Publisher(s): AIP Publishing
File Format(s): application/pdf
First Indexed: 2017-01-20 05:52:26 Last Updated: 2019-12-06 07:07:46