The invention concerns the use of cyclic azaboronates as sensitive materials in sensors for the detection of the presence of peroxides, in particular hydrogen peroxide, in a gaseous environment. It further concerns new cyclic azaboronates, as well as sensors comprising these azaboronates as sensitive materials. Applications for the invention include the following: fight against terrorism, monitoring for security purposes of sites in which peroxides or peroxidable compounds are manufactured, stored, and/or used, monitoring of atmospheric pollution, etc.