The basis of these colorimetric sensors is based on color change by various mechanisms such as photochromism (light), electrochromism (oxidation/reduction), thermochromism (heat), cellochromism (solvent polarity), ionochromism (ions), and halochromism (PH). There are various mechanisms for measuring gas by colorimetric method, which we will mention 4 main classes. Ring Opening and Closing Reactions: These colors and organic compounds are composed of aromatic structures that have many conjugated π-system. In a conjugate π system, electrons can pick up specific photons when resonating at a certain distance from the P orbitals; In other words, the wavelength of the photon captured is affected by the length of the number of conjugated π-systems. For example, the number of conjugated π-systems and the extension or expansion of a conjugate system can shift the absorption spectrum of materials. Dyes and other organic compounds used as colorimetric gas sensors usually show ring-opening or closing reactions that can lead to changes in the number of conjugate π bonds. These changes can cause to use colors as the color sensor gas meter material.
The basis of these colorimetric sensors
is based
on
color
change
by various mechanisms such as
photochromism
(light),
electrochromism
(oxidation/reduction),
thermochromism
(heat),
cellochromism
(solvent polarity),
ionochromism
(ions), and
halochromism
(PH). There are various mechanisms for measuring gas by colorimetric method, which we will mention 4 main classes. Ring Opening and Closing Reactions: These colors and organic compounds
are composed
of aromatic structures that have
many
conjugated
π-system
. In a conjugate π
system
, electrons can pick up specific photons when resonating at a certain distance from the P orbitals;
In other words
, the wavelength of the photon captured is
affected
by the length of the number of conjugated
π-systems
.
For example
, the number of conjugated
π-systems
and the extension or expansion of a conjugate
system
can shift the absorption spectrum of materials. Dyes and other organic compounds
used
as colorimetric gas sensors
usually
show
ring-opening or closing reactions that can lead to
changes
in the number of conjugate π bonds. These
changes
can cause to
use
colors as the
color
sensor gas meter material.