Metallic tin-based nanoparticles synthesis by laser pyrolysis: Parametric studies focused on the decreasing of the crystallite size

•Metallic tin-based nanoparticles were synthesized using laser pyrolysis technique.•Tetramethyltin was used as precursors whereas ethylene was the sensitizer.•The nanoparticles where covered with a tin oxidized/carbonaceous shell.•Their size where decreased by diminishing the laser beam residence ti...

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Bibliographic Details
Published in:Applied surface science 2015-05, Vol.336, p.290-296
Main Authors: Dutu, E., Dumitrache, F., Fleaca, C.T., Morjan, I., Gavrila-Florescu, L., Morjan, I.P., Sandu, I., Scarisoreanu, M., Luculescu, C., Niculescu, A.-M., Vasile, E.
Format: Article
Language:English
Subjects:
Crystallites
Ethylene
Laser pyrolysis
Lasers
Li-ion batteries
Nanoparticles
Nanopowder
Nanostructure
Precursors
Pyrolysis
Tin
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Summary:•Metallic tin-based nanoparticles were synthesized using laser pyrolysis technique.•Tetramethyltin was used as precursors whereas ethylene was the sensitizer.•The nanoparticles where covered with a tin oxidized/carbonaceous shell.•Their size where decreased by diminishing the laser beam residence time. Due to their characteristic to allow a continuous, one-step nanosize particles production, the laser pyrolysis technique was employed to synthesize metallic Sn-based nanoparticles using tetramethyltin vapors as precursors and ethylene as laser energy transfer agent (sensitizer). Small size of tin particles is a requirement for their use as anodes in lithium ion batteries. In order to decrease the particle size, some experimental parameters were varied, allowing the control of the crystallite size down to 30nm. The diminishing diameter of the reactive flow injection nozzle as well as the increasing of the tin precursor vapor flow enhance the gas velocity and the decrease the reactive species residence time in the laser beam, resulting smaller tin nanodroplets which forms solid nanoparticles after rapid cooling. XRD, TEM, EDX and SAED analysis point to the formation of nanosize β-Sn particles accompanied by various amount of disordered carbon as coating provided by ethylene decomposition (associated with their polymerization/dehydrogenation) in the presence of methyl radicals from Sn(CH3)4.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.12.092