Chemistry Reference
In-Depth Information
d
n
3
r
4
n
g
|
4
Figure 11.6
SEM image of a Cu-Co alloy dendrite nanostructure (magnification:
(a) 6000
and (b) 30 000
) and chronoamperometric responses in
(c) 0.1 M NaOH with glucose spikes (applied potential:
รพ
0.65 V) and
in (d) 0.1 M PBS after successive spikes with H
2
O
2
(applied potential:
0.40 V) (adapted from ref. 33 with permission).
.
0.5 mM to 14 mM, a response time of 5 s and an LOD of 0.1 mM at an applied
potential of 0.65 V. In the case of the H
2
O
2
sensor, the linear range was from
1 mM to 11 mM with a sensing response time of 5 s and the LOD was 0.75 mM
at an applied potential of -0.4 V as shown in Figure 11.6(c) and (d). It was
noted that the Cu-Co alloy dendrite demonstrated a huge catalytic ability in
both glucose oxidation and H
2
O
2
reduction compared to traditional Cu and
Co electrodes.
Zeng et al.
34
manufactured a graphene/HRP (horseradish peroxidase) 2-3
multi-sheet nanostructure by a layer-by-layer (LbL) self-assembled technique
anduseditforanenzymaticH
2
O
2
sensor. The sensor had a sensitivity of 220 mA
cm
2
(mM)
1
on a linear range of 1 mM to 2.6 mM, a response time of less than
2sandanLODof0.1mM at an applied potential of -0.08 V. Guo et al.
35
made
1-3 sphere hierarchical Au nanowires by hydrothermal growth. The fabricated
H
2
O
2
sensor had a linear range up to 0.8 mM, a response time of 3.5 s and an
LOD of 1.2 mM at an applied potential of -0.2 V. Furthermore, Shim et al.
36
synthesized 1-3 cactus-like IrO
2
nanowires on a platinum electrode by vapor
phase growth as shown in Figure 11.7(a) and (b). It was used as a dihy-
dronicotinamide adenine dinucleotide (NADH) sensor, which had a sensitivity
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