Controlled Supramolecular Assembly of Helical Silica Nanotube鈥揋raphene Hybrids for Chiral Transcription and Separation

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• 作者：Jong Hwa Jung ; Seung-Jin Moon ; Jinho Ahn ; Justyn Jaworski ; Seiji Shinkai
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：March 26, 2013
• 年：2013
• 卷：7
• 期：3
• 页码：2595-2601
• 全文大小：368K
• 年卷期：v.7,no.3(March 26, 2013)
• ISSN：1936-086X

文摘

Chiral templating and enantioselective separations are demonstrated on graphene surfaces as directed by encapsulated silica nanotubes. Electrostatic assembly of helical silica nanotubes within graphene sheets results in a hybrid material with the electrochemical properties of graphene and the capability for chiral recognition. Control of the silica nanotube helicity within the graphene hybrid provides a means for directed chiral templating of guest molecules on the outer graphene surface as revealed in the chiral transcription of N¹,N³,N⁵-tri(4-pyridinyl)cyclohexane-1,3,5-tricarboxamide as well as polyallylamine into supramolecular templated assemblies. Changing the helicity of the internal nanotube also provides control over enantiomer selectivity as demonstrated by the chiral separation of racemic mixtures of phenylalanine, tryptophan, and alanine derivatives.

Keywords:

reduced graphene oxide; helical silica; chiral transcription; hybrid; nanotube