Abstract
The performance of microchip electrophoresis/electrochemistry system with carbon nano-tube (CNT) film electrodes was studied. Electrocatalytic activities of different carbon materials (single-wall CNT (SWCNT), multiwall CNT (MWCNT), carbon powder) cast on different electrode substrates (glassy carbon (GC), gold, and platinum) were compared in a microfluidic setup and their performance as microchip electrochemical detectors was assessed. An MWCNT film on a GC electrode shows electrocatalytic effect toward oxidation of dopamine (E1/2 shift of 0.09 V) and catechol (E1/2 shift of 0.19 V) when compared to a bare GC electrode, while other CNT/carbon powder films on the GC electrode display negligible effects. Modification of a gold electrode by graphite powder results in a strong electrocatalytic effect toward oxidation of dopamine and catechol (E1/2 shift of 0.14 and 0.11 V, respectively). A significant shift of the half-wave potentials to lower values also provide the MWCNT film (E1/2 shift of 0.08 and 0.08 V for dopamine and catechol, respectively) and the SWCNT film (E1/2 shift of 0.10 V for catechol) when compared to a bare gold electrode. A microfluidic device with a CNT film-modified detection electrode displays greatly improved separation resolution (Rs) by a factor of two compared to a bare electrode, reflecting the electrocatalytic activity of CNT.
| Original language | English |
|---|---|
| Pages (from-to) | 1274-1280 |
| Number of pages | 7 |
| Journal | Electrophoresis |
| Volume | 28 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2007 Apr 1 |
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All Science Journal Classification (ASJC) codes
- Clinical Biochemistry
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Carbon nanotube detectors for microchip CE : Comparative study of single-wall and multiwall carbon nanotube, and graphite powder films on glassy carbon, gold, and platinum electode surfaces. / Pumera, Martin; Merkoçi, Arben; Alegret, Salvador.
In: Electrophoresis, Vol. 28, No. 8, 01.04.2007, p. 1274-1280.Research output: Contribution to journal › Article
TY - JOUR
T1 - Carbon nanotube detectors for microchip CE
T2 - Comparative study of single-wall and multiwall carbon nanotube, and graphite powder films on glassy carbon, gold, and platinum electode surfaces
AU - Pumera, Martin
AU - Merkoçi, Arben
AU - Alegret, Salvador
PY - 2007/4/1
Y1 - 2007/4/1
N2 - The performance of microchip electrophoresis/electrochemistry system with carbon nano-tube (CNT) film electrodes was studied. Electrocatalytic activities of different carbon materials (single-wall CNT (SWCNT), multiwall CNT (MWCNT), carbon powder) cast on different electrode substrates (glassy carbon (GC), gold, and platinum) were compared in a microfluidic setup and their performance as microchip electrochemical detectors was assessed. An MWCNT film on a GC electrode shows electrocatalytic effect toward oxidation of dopamine (E1/2 shift of 0.09 V) and catechol (E1/2 shift of 0.19 V) when compared to a bare GC electrode, while other CNT/carbon powder films on the GC electrode display negligible effects. Modification of a gold electrode by graphite powder results in a strong electrocatalytic effect toward oxidation of dopamine and catechol (E1/2 shift of 0.14 and 0.11 V, respectively). A significant shift of the half-wave potentials to lower values also provide the MWCNT film (E1/2 shift of 0.08 and 0.08 V for dopamine and catechol, respectively) and the SWCNT film (E1/2 shift of 0.10 V for catechol) when compared to a bare gold electrode. A microfluidic device with a CNT film-modified detection electrode displays greatly improved separation resolution (Rs) by a factor of two compared to a bare electrode, reflecting the electrocatalytic activity of CNT.
AB - The performance of microchip electrophoresis/electrochemistry system with carbon nano-tube (CNT) film electrodes was studied. Electrocatalytic activities of different carbon materials (single-wall CNT (SWCNT), multiwall CNT (MWCNT), carbon powder) cast on different electrode substrates (glassy carbon (GC), gold, and platinum) were compared in a microfluidic setup and their performance as microchip electrochemical detectors was assessed. An MWCNT film on a GC electrode shows electrocatalytic effect toward oxidation of dopamine (E1/2 shift of 0.09 V) and catechol (E1/2 shift of 0.19 V) when compared to a bare GC electrode, while other CNT/carbon powder films on the GC electrode display negligible effects. Modification of a gold electrode by graphite powder results in a strong electrocatalytic effect toward oxidation of dopamine and catechol (E1/2 shift of 0.14 and 0.11 V, respectively). A significant shift of the half-wave potentials to lower values also provide the MWCNT film (E1/2 shift of 0.08 and 0.08 V for dopamine and catechol, respectively) and the SWCNT film (E1/2 shift of 0.10 V for catechol) when compared to a bare gold electrode. A microfluidic device with a CNT film-modified detection electrode displays greatly improved separation resolution (Rs) by a factor of two compared to a bare electrode, reflecting the electrocatalytic activity of CNT.
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U2 - 10.1002/elps.200600632
DO - 10.1002/elps.200600632
M3 - Article
VL - 28
SP - 1274
EP - 1280
JO - Electrophoresis
JF - Electrophoresis
SN - 0173-0835
IS - 8
ER -