Synthesis, characterization, and electrochemical testing of carbon nanotubes derivatized with azobenzene and anthraquinone |
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Authors: | K. Sadowska R. Wiser E. Jab?onowska |
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Affiliation: | a Department of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-952 Gdansk, Poland b Department of Chemistry and Biochemistry, The University of Tulsa, 800 S. Tucker Dr., Tulsa, OK 74104, USA c Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland |
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Abstract: | Multi-walled and single-walled carbon nanotubes were side-wall functionalized with azobenzene and anthraquinone residues, i.e., chemical groups possessing redox activity, for potential utilization in functional catalysis and memory storage devices. Solvent-free synthesis was performed with diazonium salts generated in situ where it was found that it was simple and effective method. Nanotube functionalization was confirmed and characterized by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). It is worth noting, that single-walled carbon nanotubes (SWCNTs) functionalized with azobenzene produced Raman modes typical of substituted azobenzenes with spectral peaks at ∼1137, 1412, and 1447 cm−1. The nanotubes containing electroactive substituents were transferred onto electrode substrates using the Langmuir-Blodgett approach and characterized by cyclic voltammetry. The amount of electroactive groups per mg of nanotubes was calculated based on the peak of cathodic current. A highly reproducible voltammetric response was obtained with a single nanotube layer or multiple nanotube/octadecanol layers. It is believed that devices such as these will be invaluable for future high-performance electrodes. |
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