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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
54-11Interference and Selectivity in Portable Chemical Sensors
Transistors: When chemical sensors are operated in potentiometric mode, a eld eect transistor (FET)
ca
n
be us
ed
to co
nvert
th
e
el
ectrochemical
sig
nal
in
to
an el
ectrical
ou
tput
wi
thout
dr
awing
cu
rrent,
th
us
gu
aranteeing
Ne
rnstian
op
eration
. To do th
is,
th
e
in
teraction
of th
e
an
alyte
of in
terest
wi
th
th
e
wo
rking
el
ectrode
of th
e
el
ectrochemical
ce
ll
ge
nerates
al
l
or pa
rt
of th
e
ga
te
vo
ltage
of th
e
tr
ansistor
. As
th
e
ga
te
vo
ltage
ch
anges,
th
e
un
derlying
ch
annel
cu
rrent
be
tween
th
e
dr
ain
an
d
so
urce
of th
e
tr
ansistor
ch
anges,
ye
t
no cu
rrent
fr
om
ga
te
to ch
annel
o
ws
(a
s
is ch
aracter ...
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Publisher Resources

ISBN: 9781439848913