Michael G. Stanford et al demonstrated a self-cleaning porous conductive graphene foam filter made of laser-induced graphene (LIG), that can trap pathogens out of the air and kill them with small pulses of electricity. LIG was formed through the photothermal conversion of a polyimide film by a commercial CO2 laser cutter. Through a periodic Joule-heating mechanism, the filter readily reaches >300 °C. This destroys any microorganisms including bacteria, along with adverse biologic reactions causing molecules such as pyrogens, allergens, mycotoxins and prions. The study recommended that the high surface area and thermal stability of LIG enable the use of graphene filter for reduction of nosocomial infection in hospital environments.
Source: ACS Nano2019 September 27, 2019 https://doi.org/10.1021/acsnano.9b05983