&lt;title&gt;NIR and UV spectroscopic techniques as tools to control nanoparticle growth in laser pyrolysis process&lt;/title&gt;

Fantoni, R.; Dominicis, L. De; Martelli, Stefano; Fino, M. Di; Carpanese, M.; Koutniak, Vladimir; Fabbri, F.

doi:10.1117/12.456067

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…Nanopowders formed in the interaction region were collected on a filter and closed in a bag, after condensation and precipitation by gravity [36]. Apart from CARS, high-resolution IR absorption [37] was also utilized to relate the onset of the dissociation threshold to a specific temperature reached by the reactants in the gas flow reactor operating in the collisional regime.…”

Section: Laser Pyrolysis For Nanopowder Productionmentioning

confidence: 99%

IR multiple-photon excitation of polyatomic molecules: a route towards nanostructures

Borsella¹,

Botti²,

Caneve³

et al. 2008

Phys. Scr.

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The availability of high power IR laser sources in the 1980s paved the way to new attractive experiments for driving chemical reactions, based on the selective excitation of vibrational modes in polyatomic molecules up to and above the dissociation threshold. The process was first studied in the collisionless regime for applications to laser isotope separation and selective chemistry, and later in collision-assisted conditions leading to the synthesis of nanostructures. In particular, the mechanisms of IR laser pyrolysis of SiH 4 and hydrocarbons were investigated in order to control the production of silicon-and carbon-based nanoaggregates. For this purpose, different on-line diagnostics were utilized to monitor the gas-phase reaction intermediates and the process of particle nucleation and growth. The basic principles of the process of multiple-photon excitation of polyatomic molecules and its applications to the synthesis of nanostructures will be reviewed in this paper. Peculiar optical properties of silicon nanoparticles and carbon nanotubes obtained as final products of the developed processes will be described in relation to remarkable applications in several fields.

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Section: Laser Pyrolysis For Nanopowder Productionmentioning

confidence: 99%

IR multiple-photon excitation of polyatomic molecules: a route towards nanostructures

Borsella¹,

Botti²,

Caneve³

et al. 2008

Phys. Scr.

Self Cite

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“…Several factors affect the growth process. These factors are the constraint conditions of the growth process [6][7][8][9]. This paper details the mechanism of the particle growth process on a molecular scale, and the heat and mass transfers in the process are analyzed as constraint conditions through a molecular dynamics study.…”

Section: Introductionmentioning

confidence: 99%

A Molecular Dynamics Study on the Constraint Conditions of the Particle Growth Process in Laser Synthesis of Nanopowders

Zhang

Li²,

Zhang³

et al. 2012

Advances in Materials Science and Engineering

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Laser-induced chemical vapor deposition (LICVD) is a nanopowder synthesis method in which the nanoparticles of a synthetic product undergo nucleation, growth, and agglomeration. The growth process is crucial because it directly determines the growth rate and final size of nanoparticles. In this paper, the nanoparticle growth process is analyzed through a molecular dynamics study, and the process is divided into five steps. In addition, this study explains the microscopic heat and mass transfer processes that occur in the surrounding space and on the particulate surface. Three constraint conditions that may restrict the growth process, namely, transfer constraint, surface constraint, and temperature constraint conditions, are proposed and modeled. To calculate the final diameter and the nanoparticle growth rate, formulae for the constraint conditions are developed. The behavior of four gases in the particulate growth zone is discussed in detail.

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<title>NIR and UV spectroscopic techniques as tools to control nanoparticle growth in laser pyrolysis process</title>

Cited by 2 publications

References 8 publications

IR multiple-photon excitation of polyatomic molecules: a route towards nanostructures

IR multiple-photon excitation of polyatomic molecules: a route towards nanostructures

A Molecular Dynamics Study on the Constraint Conditions of the Particle Growth Process in Laser Synthesis of Nanopowders

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