Laser pyrolysis synthesis and characterization of luminescent silicon nanocrystals

Synthesis and On-line Size Control of Silicon Quantum Dots

“…It is achieved, for example, by increasing the laser average power, by decreasing the absolute precursor flow rate or by increasing the SiH4 volume concentration. For example, a production rate for 9.5-nm Si-QDs about ten times larger than that for 4.2 nm Si-QDs was observed earlier 9) . The distance between the nozzle end and the laser spot horizontal axis is chosen at 2.5 mm with the help of computational fluid dynamics investigations (see below).…”

“…7. Previous works showed that they were monocrystalline in similar synthesis conditions 9) . Therefore, we assume that the maximum reaction temperature during gate-on slots in our case is between 770 K and 1687 K, and depends on Ton.…”

“…These particles were found to be adequate as a starting material for biomedical imaging applications, for which a photoluminescence maximum is needed in the near infrared. The final material is obtained by chemical post-treatment and functionalization 9) .…”

“…It was recently found that this method could be optimized for relatively large production rates of small Si-QDs using a microsecond-gated CO2 laser 9) . However, as their properties change rapidly as a function of their size, a precise control at the synthesis stage and on-line diagnostics are needed for specific applications.…”

Biomedical and Sensor Applications of Silicon Nanoparticles

“…Bearing this in mind, in the framework of the BONSAI Project, 1 we tried to evaluate the initial phase of NPs-cell membrane interaction, addressing, in particular, the standard viability tests and their correlation with alteration in transendo-/epithelial resistance. Biocompatibility tests were performed on Si NPs prepared by laser pyrolysis [22,24,73].…”