Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals

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• 作者：Yixuan Yu ; Clare E. Rowland ; Richard D. Schaller ; Brian A. Korgel
• 刊名：Langmuir
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：31
• 期：24
• 页码：6886-6893
• 全文大小：729K
• ISSN：1520-5827

文摘

Hydride-terminated silicon (Si) nanocrystals were capped with dodecanethiol by a thermally promoted thiolation reaction. Under an inert atmosphere, the thiol-capped nanocrystals exhibit photoluminescence (PL) properties similar to those of alkene-capped Si nanocrystals, including size-tunable emission wavelength, relatively high quantum yields (>10%), and long radiative lifetimes (26鈥?80 渭s). X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy confirmed that the ligands attach to the nanocrystal surface via covalent Si鈥揝 bonds. The thiol-capping layer, however, readily undergoes hydrolysis and severe degradation in the presence of moisture. Dodecanethiol could be exchanged with dodecene by hydrosilylation for enhanced stability.