  With the development of nanotechnology, it has been discovered that some
nanomaterials have the activity of mimicking enzymes. This type of inorganic
nanomaterial with characteristics similar to natural enzymes is called
nanoenzyme. Compared with natural enzymes, nanoenzymes have advantages such as
low deactivation, good stability, low production and storage costs, surface
modification, and large-scale preparation. They have a wide range of
applications in fields such as human health, environmental safety, and
biosensing. MoS$_2$ can replace natural peroxidase to catalyze the
decomposition of H$_2$O$_2$ and is considered to have peroxidase like activity,
making it a typical nanoenzyme material. In addition, the Fenton reaction
between Fe$_2^+$ and H$_2$O$_2$ can also cause H$_2$O$_2$ to decompose. Both
MoS$_2$ and Fe$_2^+$ can cause the decomposition of H$_2$O$_2$, resulting in
the production of hydroxyl radicals (OH). Hydroxyl radicals can catalyze the
oxidation of chromogenic substrates 3,3',5,5'-tetramethylbenzidine (TMB),
generating blue single electron oxidation products (oxTMB) and characteristic
absorption peaks at 652 nm. Based on this characteristic, we doped Fe$_2^+$
into MoS$_2$ to obtain Fe-MoS$_2$ composite materials. Firstly, natural glucose
oxidase is used to decompose glucose into glucose lactone and hydrogen
peroxide. Then, Fe-MoS$_2$ composite material is added, and TMB is added
dropwise to observe the blue turning of the mixed solution. Based on the above
principle, colorimetric detection of glucose can be achieved. In addition,
under infrared irradiation, the activity of peroxidase like enzymes in
Fe-MoS$_2$ is enhanced.
