It would depend on the various energy bands of the working materials making up the «filter». (realclimate.org)
Energy bands do not make sufficiently specific claims that there is fraud. (law.stackexchange.com)
Sensors made with atomically thin layers of MoS2 revealed better selectivity to certain gases owing to the electron energy band gap in this material, which resulted in strong suppression of electrical current upon exposure to some of the gases. (sciencedaily.com)