Assembling Photoluminescent Silicon Nanocrystals into Periodic Mesoporous Organosilica

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• 作者：Min Guan ; Wendong Wang ; Eric J. Henderson ; 脰mer Dag ; Christian K眉bel ; Venkata Sai Kiran Chakravadhanula ; Julia Rinck ; Igor L. Moudrakovski ; Jordan Thomson ; Jeffrey McDowell ; Annie K. Powell ; Haixia Zhang ; Geoffrey A. Ozin
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：May 23, 2012
• 年：2012
• 卷：134
• 期：20
• 页码：8439-8446
• 全文大小：503K
• 年卷期：v.134,no.20(May 23, 2012)
• ISSN：1520-5126

文摘

A contemporary question in the intensely active field of periodic mesoporous organosilica (PMO) materials is how large a silsesquioxane precursor can be self-assembled under template direction into the pore walls of an ordered mesostructure. An answer to this question is beginning to emerge with the ability to synthesize dendrimer, buckyball, and polyhedral oligomeric silsesquioxane PMOs. In this paper, we further expand the library of large-scale silsesquioxane precursors by demonstrating that photoluminescent nanocrystalline silicon that has been surface-capped with oligo(triethoxysilylethylene), denoted as ncSi:(CH₂CH₂Si(OEt)₃)_nH, can be self-assembled into a photoluminescent nanocrystalline silicon periodic mesoporous organosilica (ncSi-PMO). A comprehensive multianalytical characterization of the structural and optical properties of ncSi-PMO demonstrates that the material gainfully combines the photoluminescent properties of nanocrystalline silicon with the porous structure of the PMO. This integration of two functional components makes ncSi-PMO a promising multifunctional material for optoelectronic and biomedical applications.