high-performance sensors generally show short response time, high sensitivity, low detection limit, and high reversibility. due to the fact many hydrogel sensors depend on the diffusion of input signals in hydrogels, limitations to these hydrogels are long response time sensors, which is due to the chemical diffusion within the normal dimensions of hydrogel sensors. To resolve this challenge, increasing the diffusion coefficient of chemicals in hydrogel D or decreasing the typical dimensions of hydrogel L can reduce the diffusion time τ considerably, according to the scaling kinetic diffusion (diffusion) τ L² / D³. The mesh size can be increased via decreasing the polymer concentration and crosslinking in the hydrogel. further to the diffusion coefficient, the typical dimension of the hydrogel is some other key parameter that controls the response time [363]. For some sensing elements, inclusive of carbon nanotubes, their stability and intensity improve upon immobilizing within the hydrogel matrix. The response time and sensitivity of the sensor to the analyte can be tunned by decreasing the particle size of the hydrogel or the density of cross-linking to control the rate of diffusion of the analytes into the hydrogel. [366]
high-performance
sensors
generally
show
short
response
time
, high sensitivity, low detection limit, and high reversibility.
due
to the fact
many
hydrogel sensors depend on the
diffusion
of input signals in hydrogels, limitations to these hydrogels are long
response
time
sensors, which is due to the chemical
diffusion
within the normal dimensions of hydrogel sensors. To resolve this challenge, increasing the
diffusion
coefficient of chemicals in hydrogel D or decreasing the typical dimensions of hydrogel L can
reduce
the
diffusion
time
τ
considerably
, according to the scaling kinetic
diffusion
(diffusion)
τ L² /
D³
. The mesh size can
be increased
via decreasing the polymer concentration and
crosslinking
in the hydrogel.
further
to the
diffusion
coefficient, the typical dimension of the hydrogel is
some
other key parameter that controls the
response
time
[363]. For
some
sensing elements, inclusive of carbon nanotubes, their stability and intensity
improve
upon immobilizing within the hydrogel matrix. The
response
time
and sensitivity of the sensor to the analyte can be
tunned
by decreasing the particle size of the hydrogel or the density of cross-linking to control the rate of
diffusion
of the analytes into the hydrogel. [366]