Biomedical Engineering Reference
In-Depth Information
Table 9.5
Summary of the functionalized CNTs used to detect some
targeted analytes
Functional
material
CNT
Type
Target
analyte
Main
rerformance
Transducer
Ref.
Polymer:
PEI, Nafion
SWCNT
FET
NO
2
, NH
DL: <1 ppb NO
2
DL: <100 ppm NH
[175]
3
3
Selectivity to NO
, NH
3
Rst: ~1-2 min; OT: RT
2
Polymer:
Polypyrrole
SWCNT
Resistor
NO
2
CR: 500-3000 ppm NO
[176]
2
Slow Reversibility at RT
Polymer:
PEI/Starch mixture
SWCNT
FET
CO
DL: <500 ppm CO
2
Rst: ~1 min; OT: RT
CR: 0.05-10% CO
[143]
2
2
Polymer:
PMMA
CNT
Resistor Dichlorometane,
chloroform,
acetone
Rst: ~2-5 at RT
Rct: ~10 s at RT
CR: ppm level
[230]
Functional groups:
PABS
SWCNT
Resistor
NH
DL: 5 ppm NH
[173]
3
3
Rst: ~3-4 min; OT: RT
Slow recovery at RT
CR: 0-100 ppm NH
3
Enzymes:
Glucose oxidase
SWCNT
Resistor
pH
Glucose measurement
Real-time GOx activity
[195]
Proteins:
Biotin
SWCNT
Resistor
Streptavidin
Recognition capability
of biomolecules
[199]
DNA
MWCNT
Resistor DNA target
DL: sub-attomole DNA
Hybridization
[214]
DNA
Oligonucleotide
probe
CNT
Resistor DNA target
Enzyme-labelled
:
DL: nanomolar level
Linearity: 50-200 nM
Label-free method
[213]
:
Linearity: 0.5-10
µ
M
Metal Oxides:
SnO
2
MWCNT
Resistor
Formaldehyde DL: 30 ppb
Rst: ~100 s at 250°C
Rct: ~90 s at 250°C
[221]
film
Metal Oxides:
SnO
2
MWCNT
Resistor
NO
2
, H
, CO
CR: 10-100 ppm (NO
)
[226]
2
2
Nanocrystals
CR: 0.1-1% (H
)
CR: 100 ppm (H
2
)
Rst: ~4-5 min; OT: RT
Rct: ~3-4 min; OT: RT
2
MetalloPorphyrins:
Mn-TPP, Zn-TPP
MWCNT
Resistor
VOCs
CR: 10-1000 ppm
OT: RT
[231]
Metals:
Pd
SWCNT
Resistor
H
CR: 4-400 ppm H
[232]
2
2
OT: RT; Rst: ~5-10 s
Rct: ~400 s
Metals:
Rh, Pd, Au, Ni
MWCNT
Resistor
C
H
DL: 50 ppb C
H
6
[241]
6
6
6
Selectivity to C
H
6
6
OT: RT
Metals:
Pt, Ru, Ag
MWCNT
Resistor Landfill Gas
(LFG): CH
4
DL: 100 ppb NO
2
in LFG
[36]
, CO
,
OT: 150°C
2
NO
2
, CO, NH
, H
3
2
DL = detection limit; S = sensitivity; CR = concentration range; Rst = response
time; Rct = recovery time; OT = operating temperature.
