Octanethiol-stabilized Si nanocrystals, ranging from 2 to 8 nm in diameter, were synthesized in cyclohexane heated and pressurized above its critical point at temperatures ranging from 400°C to 500°C. The nanocrystals exhibit crystalline cores and photoluminesce with relatively high efficiencies. These nanocrystals are suitable for single particle spectroscopic measurements that reveal optical information about the individual chromophores that are buried in ensemble measurements. The sterically-stabilized Si nanocrystals emit with relatively narrow emission spectra at room temperature, characteristic of molecules.
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Pell, L.E., Yu, Z., English, D.S. et al. Single Particle and Ensemble Spectroscopy of Silicon Nanoparticles. MRS Online Proceedings Library 704, 341 (2001). https://doi.org/10.1557/PROC-704-W3.4.1