Biomedical Engineering Reference
In-Depth Information
Llobet and coworkers [241] prepared hybrid materials
consisting of oxygen plasma treated MWCNTs decorated with metal
nanoparticles (e.g., Rh, Pd, Au or Ni) for tailored gas recognition of
benzene vapors below 50 ppb with high sensitivity and selectivity, at
room temperature. Espinosa
. [235] decorated plasma-treated
CNT films with Au or Ag clusters by evaporation for detecting NO
et al
up
2
to a 500 ppb level at room temperature. Star
. [242] decorated
SWCNTs by selective electroplating either with Pt, Pd, Au, or Rh for
detecting a large variety of gases such as CO, NO
et al
, CH
, H
S, NH
, and
2
4
2
3
H
[28] employed Pd-coated SWCNTs for
room temperature methane detection [234] and for discriminating
NO
. Also, Meyyappan
et al.
2
, acetone, and benzene [39] using the multivariate
technique of the principal component analysis (PCA). Wongwiriyapan
et al
, HCN, HCL, Cl
2
2
. [236] demonstrated highly sensitive detection of CO down to 1
ppm at room temperature using Pt-decorated SWCNT layer. Xie
.
[239] demonstrated Pt-decorated SWCNT layer for a highly sensitive
glucose biosensor. A summary of metal-functionalized CNTs chemical
sensors is shown in Table 9.6.
et al
Table 9.6
Summary of the metal-functionalized CNTs used to detect
some targeted analytes
Functional
metal
CNT
type
Target
analyte
Main
performance
Transducer
Ref.
Pd
SWCNT
Resistor
H
CR: 4-400 ppm H
[232]
2
2
OT: RT; Rst: ~5-10 s
Rct: ~400 s
Pd, Pt, Rh,
Sn, Au
SWCNT
FET
H
, CH
, CO,
Metal CNT sensor
array for personal
safety
[242]
2
4
H
S, NO
, NH
2
2
3
Pd
SWCNT
Resistor
CH
DL: 6 ppm CH
[234]
4
4
Reversibility with UV
OT: 20-150°C
Rst: 2-4 min
Rh, Pd, Au,
Ni
MWCNT
Resistor
C
H
DL: 50 ppb C
H
[241]
6
6
6
6
Selectivity to C
6
H
6
OT: RT
Pt, Ru, Ag
MWCNT
Resistor
Landfill gas
(LFG): CH
DL: 100 ppb NO
in
[36]
2
,
LFG
OT: 150°C
4
CO
, NO
, CO,
2
2
NH
, H
3
2
Pd, Pt, etc.
SWCNT
Resistor
NO
, HCN,
HCl, Cl
DL: a few ppm level
OT: RT
PCA analysis
[39]
2
, CH
,
2
4
acetone, C
H
,
6
6
