Study of Chitosan-Stabilized Ti(3)C(2)T(x) MXene for Ultrasensitive and Interference-Free Detection of Gaseous H(2)O(2)

[Image: see text] The development of sensitive, selective, and reliable gaseous hydrogen peroxide (H(2)O(2)) 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 Ti(3)C(2)T(x) MXene 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 H(2)O(2). The sensor showed highly sensitive and selective electroanalytical performance for detecting trace concentrations of gaseous H(2)O(2) with 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 H(2)O(2) during the real hair bleaching process with a 9 and 12% H(2)O(2) solution.