Electrochemical Redox Switchable Dispersion of Single-Walled Carbon Nanotubes in Water

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• 作者：Anchao Feng ; Liao Peng ; Bowen Liu ; Senyang Liu ; Shanfeng Wang ; Jinying Yuan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：8
• 期：17
• 页码：11024-11030
• 全文大小：511K
• 年卷期：0
• ISSN：1944-8252

文摘

We present a new, efficient approach to achieve superior dispersibility of single-walled carbon nanotubes (SWNTs) in water by integrating reversible host–guest interaction and π–π stacking. In this approach, β-cyclodextrin (β-CD) was first modified with a pyrene group to be adsorbed onto the wall of pristine SWNTs via π–π stacking, followed by further functionalization with ferrocene (Fc)-terminated water-soluble poly(ethylene glycol) (PEG) through supramolecular host–guest interaction between β-CD and Fc. Upon alternate electrochemical oxidative/reductive stimuli, the reversible host–guest pair enabled the PEG-Fc@Py-CD@SWNTs to exhibit switchable conversion between dispersion and aggregation states. Electric field controllable PEG-Fc@Py-CD@SWNTs with good reversibility and intact nanotube structure may find potential applications in selective screening of SWNTs, biosensors, and targeted drug delivery.