Technological
development
in
various
industrial
branches
brings
the
use
of
great
amounts
chemical
with
it.
Considering
direct/indirect
release
vapours
those
chemicals
to
environment
poses
a
dramatical
direct
threat
living
organisms
and
human
being,
particular.
On
that
note,
detection
gases
volatile
organic
compounds
through
monitoring
indoor/outdoor
air
pollutions
order
help
managing
processes
has
been
gaining
much
more
importance
day
by
day.
Hence,
construction
elaborated
supramolecular
systems
drawn
considerable
attention.
There
have
limited
interesting
favoured
macrocyclic
presented
due
their
readily
modification/
functionalization
suitable
groups
cavity
structure
preparing
way
for
recognition
ability
variety
target
analytes
such
as
ions
molecules.
One
these
macrocycles,
namely
calix[4]arenes
centre
attention
make
available
new
dimensions
host-guest
chemistry.
In
this
chapter,
unique
characteristics,
application
potential
calix[4]arene
designs
gas
sensors
are
discussed
it
is
expected
present
calix[4]arene-based
shedding
light
on
scientists
working
domain.
ChemistrySelect,
Год журнала:
2021,
Номер
6(19), С. 4670 - 4676
Опубликована: Май 17, 2021
Abstract
A
newly
synthesized
calix[4]arene
thiourea
derivative
decorated
with
2‐(2‐aminophenyl)benzothiazole
unit
is
selected
to
take
part
important
role
in
host‐guest
interactions
of
the
macrocyclic
molecules.
p‐tert
‐butylcalix[4]arene
dithiourea
(
C[4]‐DT
)
Langmuir‐Blodgett
(LB)
thin
films
are
prepared
and
characterized
develop
a
new
sensing
element
for
detection
seven
different
organic
vapors
(dichloromethane,
chloroform,
acetone,
benzene,
carbon
tetrachloride,
toluene
m
‐xylene).
The
preparation
‐based
onto
substrates
was
successfully
uniformly
achieved
linear
regressions
0.9971
0.9954
coating
quartz
glass
crystal,
respectively.
frequency
shift
(61.01
Hz)
mass
deposited
crystal
(969.80
ng)
were
calculated
each
layer.
swelling
dynamics
QCM
chemical
sensor
also
illuminated
by
developing
early
time
Fick's
diffusion
equation.
measurements
can
be
concluded
that
owing
its
high
sensitivity
(6.63
Hz/ppm),
fast
response
low
limit
(0.45
ppm),
this
proposed
LB
coated
expected
promising
alternative
DCM
vapor.
IEEE Sensors Journal,
Год журнала:
2019,
Номер
19(20), С. 9097 - 9104
Опубликована: Июль 7, 2019
Graphene
oxide
(GO)
Langmuir-Blodgett
(LB)
thin
films
were
prepared
to
use
as
chemical
sensor
element.
The
properties
of
GO
LB
film
layers
characterized
via
Quartz
crystal
microbalance
(QCM)
method.
Selectivity
the
various
organic
vapors
was
investigated
by
surface
plasmon
resonance
(SPR)
and
QCM
techniques.
Fick's
equations
used
for
calculating
diffusion
coefficients
(D)
values
vapors.
It
observed
that
gas
sensing
characteristics
shows
a
large
response
some
hazardous
Then,
using
experimental
measurements
obtained
during
this
process,
NARX-ANN-based
mathematical
model
frequency
shift
quartz
resonator
designed.
results
NARX-ANN
verify
efficiency
designed
model.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(42), С. 48945 - 48951
Опубликована: Окт. 12, 2023
We
have
engineered
a
colorimetric
sensor
capable
of
selective
and
sensitive
detection
amino
acids.
This
employs
supramolecular
copper-dependent
oxidase
mimic
as
the
probe,
stemming
from
our
prior
research.
The
is
constructed
through
self-assembly
commercially
available
guanosine
monophosphate
(GMP),
Fmoc-lysine,
Cu2+.
It
catalyzes
formation
red
product
with
maximum
absorbance
at
510
nm.
changes
in
color
are
responsive
to
both
concentrations
types
acids
present.
effect
most
pronounced
presence
histidine,
limit
(LOD)
6.4
nM.
Furthermore,
catalytic
probe
can
distinguish
histidine
histamine
imidazole
propionate,
well
1-methyl-histidine
3-methyl-histidine,
based
on
their
distinct
coordination
capacities
copper.
underscores
high
selectivity
sensing
platform.
Both
theoretical
simulations
experimental
results
(including
UV–vis
spectra,
fluorescence,
EPR)
indicate
that
may
engage
copper
center
coordination,
thereby
impeding
O2
access
copper─a
pivotal
aspect
catalysis.
platform,
characteristic
its
swift
response,
simple
fabrication,
exceptional
sensitivity
selectivity,
also
be
applied
detect
other
biological
analytes
such
nucleotides.
holds
potential
for
use
environmental
biochemical
analyses.
IEEE Sensors Journal,
Год журнала:
2020,
Номер
20(24), С. 14732 - 14739
Опубликована: Июль 22, 2020
This
study
presented
that
deca
pyridin-2-amine
bearing
Pillar[5]arene
(P5-PA)
was
designed
in
an
appropriate
cavity,
which
acts
a
part
significant
role
host-guest
interactions
of
the
macrocyclic
molecules.
P5-PA
monolayer
deposited
onto
suitable
substrates
as
active
layer
by
using
Langmuir-Blodgett
(LB)
coating
technique
to
examine
its
vapor
sensing
capabilities
against
some
aliphatic
hydrocarbons
through
Quartz
Crystal
Microbalance
(QCM)
technique.
The
kinetic
studies
were
occurred
exposing
P5-PA/LB
thin
film
different
percentage
organic
VOCs
vapors
such
dichloromethane,
chloroform
and
carbon
tetrachloride
air-VOCs
mixture.
early-time
Fick's
diffusion
law
handled
extract
coefficients
utilizing
QCM
data
depending
real
time.
It
is
observed
there
two
regions
with
slopes
indicating
one
belongs
slow
surface
another
fast
for
bulk
into
LB
film.
collected
experimental
1
Hz
sampling
frequency
modelled
deep
learning
models
(NARNET
LSTM)
could
get
satisfactory
results
on
small
datasets.
trained
83%
samples
data;
remaining
17%
used
evaluate
developed
prediction
performance.
predicted
values
compared
original
(measured)
section.
from
results;
have
higher
than
0.98
correlation
coefficient
each
vapor,
applications.
