Device for producing negatively charged nanoparticles and a method for the same

A method for producing negatively charged nanoparticles, characterized in that there is only one electron supermicroemitter with one potential in the device for producing negatively charged nanoparticles;

• the dimension of the emitting part of the electron supermicroemitter is smaller than or equal to a micro level;
• the potential of the electron supermicroemitter to the ground is controlled in the range of −2 kV to −29 kV by a power supply and a controller in accordance with the shape, size and different application equipment, so as to form field electron emitting of tunneling effect;
• the energy of electrons e with high current density produced by the emitter can be adjusted during the electrons' colliding with particles in air aerosol such that the electrons are attached to the nanoparticles Nm of different size with wider energy band, to form negatively charged nanoparticles by the following reaction:
• e+Nm→N−m
• and under the action of the electric field with any potential within the range of −2 kV to −29 kV, these nanoparticles can rapidly diffuse outward to cover a certain area.