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- W1996203497 abstract "We developed a supercritical solution phase synthesis of silicon nanocrystals. High temperature and pressure (500°C, >140 bar) conditions allow a wet chemical approach to this challenging synthesis. Diphenylsilane was used as a silicon precursor and long chain thiols and alcohols were used to sterically stabilize the luminescent nanocrystals. Moderate size separation was achieved via size exclusion chromatography using crosslinked styrene divinylbenzene beads. Size separated fractions of silicon nanocrystals exhibit quantum efficiencies of 12% while polydisperse samples have quantum efficiencies of 5%. Nanocrystal size distributions have been determined with transmission electron microscopy and further characterized with atomic force microscopy (AFM). These silicon nanocrystals have size tunable photoluminescence as indicated by their ensemble spectroscopy and further verified through AFM and single nanocrystal photoluminescence spectroscopy. Fluorescence intermittency (characteristic of single CdSe nanocrystals) is present in our isolated silicon nanocrystals and is one of the criteria used to distinguish single crystals from clusters of particles." @default.
- W1996203497 created "2016-06-24" @default.
- W1996203497 creator A5030067057 @default.
- W1996203497 creator A5079323802 @default.
- W1996203497 date "2002-11-01" @default.
- W1996203497 modified "2023-09-27" @default.
- W1996203497 title "Optical properties of silicon nanocrystals synthesized in supercritical fluids" @default.
- W1996203497 doi "https://doi.org/10.1117/12.452254" @default.
- W1996203497 hasPublicationYear "2002" @default.
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