Abstract
Arrays of aligned multi-walled carbon nanotube-ionic liquid (MIL) were assembled on silicon wafers (Si-MIL). Formation of Si-MIL was confirmed by FTIR, AFM and Raman techniques. The electrochemical measurements indicated that Si-MIL showed good electrocatalysis towards oxygen reduction compared with MIL drop-cast on a glassy carbon electrode.
Highlights
The unique properties of carbon nanotubes (CNTs) have been the reason for the rapid progress in synthesis of nanotubes and the use of CNTs in electronics [1]
In this study we have focused on development of an array of aligned multi-walled carbon nanotube-ionic liquid (MIL) assembled on silicon wafer (Si-MIL) as the electrode for catalytic reduction of oxygen
The peak at 3,322 cm-1 in spectrum (b) is ascribed to the presence of O-H groups and is believed to result from either ambient atmospheric moisture tightly bound to the multi-walled carbon nanotubes (MWCNTs) or as result of oxidation during purification of the raw material [29]
Summary
The unique properties of carbon nanotubes (CNTs) have been the reason for the rapid progress in synthesis of nanotubes and the use of CNTs in electronics [1]. Multi-walled carbon nanotubes (MWCNTs) are electrocatalytically active in the reduction of oxygen [2]. In order to fully utilize the outstanding electronic properties of CNTs, the focus of research so far has been on the growth of vertically well-aligned carbon nanotube arrays on suitable substrates [11]. The densely arrayed but mutually separated CNTs on a conductive substrate are ideal in constructing high-surface-area electrodes for fuel cell application and in developing amperometric chemical sensors and biosensors [13]. In this study we have focused on development of an array of aligned multi-walled carbon nanotube-ionic liquid (MIL) assembled on silicon wafer (Si-MIL) as the electrode for catalytic reduction of oxygen. After functionalization with IL-NH2 the ends of the multi-walled carbon nanotubes will be positively charged and the electrostatic repulsion between the individual modified CNTs prevents aggregation of the carbon nanotubes
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