A device for detecting and/or quantifying organophosphorus compounds, including an electrical device including a source electrode and a drain electrode separated by a semiconductive material, characterized in that at least one receptor molecule, including a group R and a primary alcohol in spatial proximity to a tertiary amine, with which the primary alcohol is capable of reacting in the presence of an organophosphorus compound, is grafted, by the group R, onto one of the electrodes or onto the semiconductive material, and a device for detecting the variation in positive charges between the two electrodes.