1
Large scale inkjet-printing of carbon nanotubes
2
electrodes for antioxidant assays in blood bags
- Electronic supporting information -
3
4
Andreas Lesch,a Fernando Cortés-Salazar,a Michel Prudent,b Julien Delobel,b Shokoufeh
5
Rastgar,c Niels Lion,b Jean-Daniel Tissot,b Philippe Tacchinid and Hubert H. Giraulta,*
6
a
Ecole Polytechnique Fédérale de Lausanne, Laboratoire d’Electrochimie Physique et
7
Analytique, Station 6, CH-1015 Lausanne, Switzerland
8
b
Service Régional Vaudois de Transfusion Sanguine, Unité de Recherche et Développement,
9
CH-1066 Epalinges, Switzerland
10
c
Department of Chemistry, Sharif University of Technology, Tehran 11155-9516, Iran.
11
d
Edel for Life, PSE-B/EPFL, CH-1015 Lausanne, Switzerland
12
*
13
EMAIL:
hubert.girault@epfl.ch
14
Telephone number:
+41 (0)21 693 31 51
15
Fax number:
+41 (0)21 693 36 67
CORRESPONDING AUTHOR FOOTNOTE
16
1
17
SI-1 Laser scanning microscopy and scanning electron microscopy of the
18
inkjet-printed carbon nanotubes electrodes
19
20
Figure SI-1. a) Laser scanning micrograph of a 4-IJPL CNT pattern on polyimide (PI). b) Scanning electron
21
micrograph of a 4-IJPL CNT pattern on Ag and PI substrate.
22
2
23
SI-2 Cyclic voltammetry of the inkjet-printed carbon nanotubes electrodes
24
25
Figure SI-2. Cyclic voltammetries (CVs, first cycle) in 2 mM FcMeOH using one 1-IJPL CNT sensor (a) and one 4-
26
IJPL CNT sensor (b). Various scan rates ν in mV·s-1: 10, 25, 50, 100, 250, 500, 1000.
27
28
Figure SI-3. Baseline-corrected anodic peak current Ipa vs. the square root of the scan rate (ν1/2) for 1-IJPL, 2-IJPL
29
and 4-IJPL CNT sensors. Electrolyte solution: 2 mM FcMeOH in 0.1 M KCl.
3
30
SI-3 Randles-Sevcik equation
31
The Randles-Sevcik equation is as follows,
32
1
2
1
1
æ F ö 23
2 * 2
ipa = 0.4463 ç
n
A
D
c
v
m
÷
è RT ø
3
33
The Randles-Sevcik equation at room temperature can be written as:
34
ipa = 2.69 ´10 n Am D c v
35
Am – microscopic electrode area (cm2)
36
ipa – anodic peak current in (A)
37
n – number of transferred electrons
38
D – diffusion coefficient of the redox mediator (cm2·s-1)
39
ν – scan rate (V·s-1)
40
c* – concentration of the redox mediator in bulk solution (mol·cm-3)
5
3
2
1
1
2 * 2
41
42
43
44
4
45
SI-4 Variation of λ and Ethreshold in the pseudo-titration voltammetry
46
47
Figure SI-4. Effect of adjusting λ and Ethreshold in the pseudo-titration process.
5