Biomedical Engineering Reference
In-Depth Information
DMMP
SWCNT network
Chemicapacitor CR: 300 ppb-3 ppm
S: ~10
[299]
∆
C
×
−3
/
C
10
at 1%
P
/
P
0
DL: <0.5 ppb; OT: RT
Rst: <10 s
Rct: <20 s
Vapors,
DMMP, DNT
DNA-decorated
SWCNT network
FET
CR: 0-1 ppm
S:
[211]
∆
I
~50%/1 ppb
DL: <1 ppb; OT: RT
Rst: <1 min
Rct: <5 min
/
I
Glucose
Pt-decorated
CNT layer
Amperometric CR: 1-28 mM
S: 52.7 (
[239]
µ
2
)/mM
DL: 1 mM; OT: RT
Rst: <25 s; Rct: NS
A/cm
Glucose
SWCNT-PPy
composite film
MEMS
CR: 0-20 mM
S: 2.6
[311]
−3
−1
×
10
S cm
/mM
DL: <1 mM; OT: RT
Rst: <1 min; Rct: NS
Epinephrine
in presence
of Ascorbic
Acid
Modified
SWCNTs
processed by
DEP
Electrochemical CR: 2-100
M
S: 28.1 A/M cm
µ
[295]
2
DL: 2
M; OT: RT
Rst: <6 s; Rct: <1 min
High stability
µ
Bacillus
atrophaeus
Purified SWCNTs Diffusivity
methods
Mass balance
CR: 0-400 CFU/ml
S: Spores adsorption study
DL: <10
[158]
spores
CFU/ml; OT: RT
Rst: NS; Rct: NS
Freundlich isotherm model
4
Generally, solid state gas sensor technology developed in the
1970s and 1980s has been commercialized by various worldwide
companies that exploit different principles of operation using
several transducers, such as resistive, electrochemical, piezoelectric
or gravimetric, optical, field-effect transistor (FET), cantilever,
MEMS. The optical, FET, and electrochemical technologies are
remarkably successful, while the resistive and piezoelectric devices
offer lower costs and higher sensitivity. Chemiresistors are the most
largely produced and commercialized. MEMS and cantilever are
more complicated in the multilevel fabrication but intrinsically high
sensitive.
This schematic classification is still valid for the CNT-based gas
sensors as well. Current efforts have led to devices with very high
sensitivity, ultra-low detection limit and promising selectivity. A wide
range of selectivities suggests that the CNTs are excellent candidates
