Nanomaterials, Vol. 13, Pages 1701: Spark Discharge Synthesis and Characterization of Ge/Sn Janus Nanoparticles

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Nanomaterials, Vol. 13, Pages 1701: Spark Discharge Synthesis and Characterization of Ge/Sn Janus Nanoparticles

Nanomaterials doi: 10.3390/nano13101701

Authors:
Anna A. Lizunova
Vladislav I. Borisov
Dana Malo
Andrey G. Musaev
Ekaterina I. Kameneva
Alexey A. Efimov
Ivan A. Volkov
Arseny I. Buchnev
Ivan A. Shuklov
Victor V. Ivanov

Germanium–tin nanoparticles are promising materials for near- and mid-infrared photonics thanks to their tunable optical properties and compatibility with silicon technology. This work proposes modifying the spark discharge method to produce Ge/Sn aerosol nanoparticles during the simultaneous erosion of germanium and tin electrodes. Since tin and germanium have a significant difference in the potential for electrical erosion, an electrical circuit damped for one period was developed to ensure the synthesis of Ge/Sn nanoparticles consisting of independent germanium and tin crystals of different sizes, with the ratio of the atomic fraction of tin to germanium varying from 0.08 ± 0.03 to 0.24 ± 0.07. We investigated the elemental and phase composition, size, morphology, and Raman and absorbance spectra of the nanoparticles synthesized under different inter-electrode gap voltages and the presence of additional thermal treatment directly in a gas flow at 750 °C. The research shows that the in-flow thermal treatment of aerosol-agglomerated nanoparticles produced special individual bicrystalline Janus Ge/Sn nanoparticles with an average size of 27 nm and a decreasing absorption function with a changing slope at 700 nm.

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