Electrochemical Investigation of Adsorption of Single-Wall Carbon Nanotubes at a Liquid/Liquid Interface.
Electrochemical Investigation of Adsorption of Single-Wall Carbon Nanotubes at a Liquid/Liquid Interface.
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DOI：
10.1002/open.201600136
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发表时间：
2017-02
期刊：
影响因子：
2.3
通讯作者：
Dryfe RA
中科院分区：
文献类型：
--
作者：
Rabiu AK;Toth PS;Rodgers AN;Dryfe RA
有很多兴趣了解碳纳米管的界面性质，特别是在水/油界面。本文以四甲基铵（TMA+）和六氟磷酸根（PF 6 −）为探针离子，研究了单壁碳纳米管（SWCNTs）在水/1，2-二氯乙烷（DCE）界面的吸附，以及吸附后的碳纳米管层对界面离子迁移的影响。界面SWCNT层的存在显著抑制了两种离子在界面上的转移，对PF 6 −离子具有更大的选择性。这种效应归因于SWCNT对界面的部分阻挡和背景电解质离子在SWCNT表面上的电位依赖性吸附，如通过X射线光电子能谱法所证实的，这是由界面SWCNT和转移离子之间的静电相互作用引起的。
There is much interest in understanding the interfacial properties of carbon nanotubes, particularly at water/oil interfaces. Here, the adsorption of single‐wall carbon nanotubes (SWCNTs) at the water/1,2‐dichloroethane (DCE) interface, and the subsequent investigation of the influence of the adsorbed nanotube layer on interfacial ion transfer, is studied by using the voltammetric transfer of tetramethylammonium (TMA+) and hexafluorophosphate (PF6 −) as probe ions. The presence of the interfacial SWCNT layer significantly suppresses the transfer of both ions across the interface, with a greater degree of selectivity towards the PF6 − ion. This effect was attributed both to the partial blocking of the interface by the SWCNTs and to the potential dependant adsorption of background electrolyte ions on the surface of the SWCNTs, as confirmed by X‐ray photoelectron spectroscopy, which is caused by an electrostatic interaction between the interfacial SWCNTs and the transferring ion.