Non-wettable, Oxidation-Stable, Brightly Luminescent, Perfluorodecyl-Capped Silicon Nanocrystal Film

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• 作者：Chenxi Qian ; Wei Sun ; Liwei Wang ; Changlong Chen ; Kristine Liao ; Wendong Wang ; Jia Jia ; Benjamin D. Hatton ; Gilberto Casillas ; Marty Kurylowicz ; Christopher M. Yip ; Melanie L. Mastronardi ; Geoffrey A. Ozin
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：136
• 期：45
• 页码：15849-15852
• 全文大小：298K
• ISSN：1520-5126

文摘

Here we describe for the first time the synthesis of colloidally stable, brightly luminescent perfluorodecyl-capped silicon nanocrystals and compare the properties of solutions and films made from them with those of their perhydrodecyl-capped relatives. The perfluorodecyl capping group compared to the perhydrodecyl capping group yields superior hydrophobicity and much greater resistance to air oxidation, the enhanced electron-withdrawing character induces blue shifts in the wavelength of photoluminescence, and the lower-frequency carbon鈥揻luorine stretching modes disfavor non-radiative relaxation pathways and boost the absolute photoluminescence quantum yield. Together these attributes bode well for advanced materials and biomedical applications founded upon perfluorodecyl-protected silicon nanocrystals.