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Article Dans Une Revue Scientific Reports Année : 2015

Synthesis of nanocrystals by discharges in liquid nitrogen from Si-Sn sintered electrode

Cédric Noel
Jaafar Ghanbaja
D. Mariotti
  • Fonction : Auteur
Thierry Belmonte

Résumé

The synthesis feasibility of silicon-tin nanocrystals by discharges in liquid nitrogen is studied using a Si-10 at % Sn sintered electrode. Time-resolved optical emission spectroscopy shows that silicon and tin melt almost simultaneously. The presence of both vapours does not lead to the synthesis of alloyed nanocrystals but to the synthesis of separate nanocrystals of silicon and tin with average sizes of 10 nm. These nanocrystals are transformed into amorphous silicon oxide (am-SiO2) and beta-SnO2 by air oxidation, after evaporation of the liquid nitrogen. The synthesis of an am-Si0.95Sn0.05 phase around large silicon crystals (similar to 500 nm) decorated by beta-Sn spheroids is achieved if the current flowing through electrodes is high enough. When the sintered electrode is hit by powerful discharges, some grains are heated and tin diffuses in the large silicon crystals. Next, these grains are shelled and fall into the dielectric liquid.
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Dates et versions

hal-01285979 , version 1 (08-12-2016)

Identifiants

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Hiba Kabbara, Cédric Noel, Jaafar Ghanbaja, K. Hussein, D. Mariotti, et al.. Synthesis of nanocrystals by discharges in liquid nitrogen from Si-Sn sintered electrode. Scientific Reports, 2015, 5, ⟨10.1038/srep17477⟩. ⟨hal-01285979⟩
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