Derivatization of SWCNTs with cobalt phthalocyanine residues and applications in screen printed electrodes for electrochemical detection of thiocholine
Jubete, E; Żelechowska, K; Loaiza, OA; Lamas, PJ; Ochoteco, E; Farmer, KD; Roberts, KP; Biernat, JF
| HERO ID | 741013 |
|---|---|
| In Press | No |
| Year | 2011 |
| Title | Derivatization of SWCNTs with cobalt phthalocyanine residues and applications in screen printed electrodes for electrochemical detection of thiocholine |
| Authors | Jubete, E; Żelechowska, K; Loaiza, OA; Lamas, PJ; Ochoteco, E; Farmer, KD; Roberts, KP; Biernat, JF |
| Journal | Electrochimica Acta |
| Volume | 56 |
| Issue | 11 |
| Page Numbers | 3988-3995 |
| Abstract | Single-walled carbon nanotubes (SWCNTs) derivatized with cobalt phthalocyanine (CoPh) were applied onto screen-printed graphite electrodes (SPEs) to be used for the low-potential electrochemical oxidation of thiocholine (TCh). Covalent attachment of CoPh to SWCNTs via stable sulfonamide bonds was confirmed by Raman/FT-IR spectroscopy and thermogravimetric analysis (TGA) coupled with FT-IR detection. The resulting modified SPE surfaces (CoPh-SWCNT-SPEs) were characterized by cyclic voltammetry and electrochemical impedance spectroscopy (EIS) with the redox probe [F(3)(CN)(6)](3-/4-). Detection of TCh was accomplished using cyclic voltammetry and amperometry; a lower overpotential (100 mV vs. Ag/AgCl pseudoreference electrode) was obtained using CoPh-SWCNT-SPEs as compared to unmodified SPEs and SPEs modified with non-functionalized SWCNTs (SWCNT-SPEs). The linear range for TCh detection was 0.077-0.45 mM, with a sensitivity of 5.11 x 10(-1) mu A mM(-1) and a limit of detection of 0.038 mM according to the 3 s/m definition. (C) 2011 Elsevier Ltd. All rights reserved. |
| Doi | 10.1016/j.electacta.2011.01.123 |
| Wosid | WOS:000290692700033 |
| Url | http://linkinghub.elsevier.com/retrieve/pii/S0013468611002246 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | SWCNT; Cobalt phthalocyanine; Thiocholine; SPE |
| Is Qa | No |