Abstract
The electroanalytic performances of glassy carbon paste electrode (GCPE), multi-walled carbon nanotube (MWCNT)-GCPE and double-walled carbon nanotube (DWCNT)-GCPE, which include HNO3 washed/unwashed materials, were compared by monitoring cyclic voltammograms of potassium ferricyanide and catechol. Electrodes were prepared by introducing proper amount of DWCNT and MWCNT into GCPE. First untreated materials (DWCNT, MWCNT, GC μ-particles) were used in the electrodes and then HNO3-treated materials were utilized for comparing difference in electrochemical performances. The effect of treatment procedure was also examined by applying Raman spectroscopy to treated and untreated materials. Moreover, TEM images were obtained for further investigation of MWCNT and DWCNT.
Highlights
Carbon nanotubes (CNT) have received considerable interest due to their attractive electronic, chemical andM
Treated and untreated CNT particles and GC l-particles were introduced into glassy carbon paste electrode (GCPE) structure for preparing electrodes
Multi-walled carbon nanotube (MWCNT 90% diameter: 110–170 nm, length: 5–9 lm), double-walled carbon nanotube (DWCNT catalog no. 637351, purity [ 90%) and mineral oil were purchased from Aldrich
Summary
Carbon nanotubes (CNT) have received considerable interest due to their attractive electronic, chemical and. GC l-particles were utilized together with mineral oil to prepare composite electrode called glassy carbon paste electrode (GCPE). The combination of GC l-particles with mineral oil results in the cooperation of favorable electron transfer kinetics of glassy carbon with the attractive advantageous composite paste electrode material. This electrode offers high electrochemical reactivity, wide potential window with a low background current while it is inexpensive, easy to prepare, modify and renew [5]. MWCNT- and DWCNT-modified GCPE were prepared by hand-mixing of 4% of nanotubes with 66% GC l-particles and 30% mineral oil. The paste surface was smoothed on a weighing paper and rinsed carefully with double distilled water
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