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|Type:||Artigo de periódico|
|Title:||Synthesis of silicon nanocrystals with erbium-rich surface layers|
|Abstract:||A route to silicon nanocrystals with erbium-rich surface layers is described involving the initial pyrolysis of disilane to produce nucleation and growth of the Si core followed by a second thermal annealing step in the presence of the volatile complex Er(tmhd)(3) (tmhd = 2,2,6,6-tetramethyl-3,5-heptanedionato). These nanoparticles were structurally characterized by transmission electron microscopy, selected area electron diffraction, energy-dispersive X-ray analysis, and extended X-ray absorption fine structure methods, while spectroscopic characterization was achieved via photoluminescence and UV-visible absorption spectroscopies. The effects of altering the length of the pyrolysis oven and its temperature, the disilane flow rate, and the Er(tmhd)(3)/helium carrier gas flow rate on the mean nanoparticle feature size are noted. Interestingly, the characteristic 120 near-infrared photoluminescence at 1540 nm is not detected in the as-formed nanoparticles but can be observed after a brief vacuum anneal at 800 degreesC.|
|Editor:||Amer Chemical Soc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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