The development of sensitive, selective, and reliable
gaseous hydrogen
peroxide (H2O2) sensors operating at room temperature
still represents a remaining challenge. In this work, we have investigated
and combined the advantageous properties of a two-dimensional Ti3C2TxMXene material
that exhibits a large specific surface area and high surface activity,
with favorable conducting and stabilizing properties of chitosan.
The MXene–chitosan membrane was deposited on the ferrocyanide-modified
screen-printed working carbon electrode, followed by applying poly(acrylic
acid) as an electrolyte and accumulation medium for gaseous H2O2. The sensor showed highly sensitive and selective
electroanalytical performance for detecting trace concentrations of
gaseous H2O2with a very low detection limit
of 4 μg m–3(4 ppbv), linear response in the
studied concentration range of 0.5–30.0 mg m–3, and good reproducibility with an RSD of 1.3%. The applicability
of the sensor was demonstrated by point-of-interest detection of gaseous
H2O2during the real hair bleaching process
with a 9 and 12% H2O2solution.