
288 Biosensors Based on Nanomaterials and Nanodevices
plasma
Gold
HO
O
O
OH
C
C
EDC
Incubation Hybridization
Fe
Fe
Fe
H
2
N
Aligned carbon
nanotube
FIGURE 11.13
A schematic illustration of the aligned nanotube–DNA electrochemical sensor. The upper-right SEM image
shows the aligned carbon nanotubes after having been transferred onto a gold foil. For reasons of clarity, only
one of the many carboxyl groups is shown at the nanotube tip and wall, respectively. (From He, P. and Dai, L.,
Chem. Commun., 2004, 348, 2004. With permission.)
–8.0
0.0 0.2 0.4
I (10
–6
A)
(a)
(b)
(c)
0.6
–4.0
0.0
4.0
8.0
12.0
FIGURE 11.14
Cyclic voltammograms of the ssDNA (I)-immobili