Nano ATO is a wide-bandgap n-type semiconductor material with non-resistive transparent conductivity. Due to its high conductivity, high visible light transmittance, and excellent mechanical and chemical stability, it is widely used in display devices, transparent electrodes for photoelectric conversion, solar cells, transparent heat insulation films, antistatic coatings and other fields. It is a multifunctional nanomaterial.

Nano tin-based transparent heat-insulating coating and its heat-insulating mechanism

Nano SnO2 is an important chemical material with wide band gap (3.6 eV), high exciton binding energy (130 meV), tetragonal rutile structure, good electrical conductivity, flame retardancy and absorption of infrared radiation, shading, and chemical Features such as stable performance. In recent years, scholars have devoted themselves to studying the influence of dopants on the performance of SnO2. Theoretically speaking, SnO2 has lattice vacancies and is an n-type semiconductor whose conductivity is between traditional semiconductors and metals. Light wave is an electromagnetic wave. The electric field of light wave causes the electrons in the metal to move, thereby absorbing the energy of light. Therefore, the higher the conductivity of the metal, the more light energy is absorbed. New tin-based materials prepared by doping indium, antimony, ytterbium, gallium and other elements into SnO2 in a certain proportion, such as ITO, ATO, nano-ytterbium tin oxide (YTO), etc., can increase the carrier density of SnO2 and make it Hole conduction appears, thereby improving the conductivity, thermal stability and mechanical properties of SnO2.

The principle of heat insulation of nano tin-based heat-insulating transparent coatings: visible light electromagnetic waves with a wavelength of 400-800nm in the solar spectrum can pass through nano-tin-based materials; electrons or lattice vibrators in nano-tin-based materials near the wavelengths of 800-2500nm In infrared light electromagnetic waves, low-level electrons or lattice vibrators produce excitation and transition to high-energy state, and the transition from low-energy state to high-energy state requires energy absorption, while sunlight can provide energy, and the energy of sunlight is absorbed during the transition process Forms the absorption of light; or the violent movement of the plasma formed by the nano-tin-based material in the electromagnetic wave electric and magnetic field environment, thereby converting the sunlight energy into heat energy, which absorbs the heat energy distributed in the infrared band and accounting for 43% of the solar energy Barrier effect, so as to achieve the effect of heat insulation.

Nano ATO heat insulation transparent coating
SnO2 is doped with antimony ions to obtain nano-ATO powder. The antimony ions occupy the Sn4+ position in the crystal lattice, forming a univalent positive charge center SbSn and an excess valence electron, increasing the net electrons and forming an n-type semiconductor , Thereby increasing the grain conductivity. While maintaining high visible light transmittance, nano ATO powder shows a sufficiently high free carrier concentration, metal-like electrical conductivity and low infrared transmittance. It is an excellent heat insulation and transparency. material. The nano-ATO powder is made into a slurry and added to the film-forming material, and then appropriate additives are added to obtain the nano-ATO heat-insulating transparent coating.

Using nano ATO dispersion and WPU or polyacrylate (PA) emulsion, a series of nano-ATO heat-insulating transparent water-based coatings with different solid content were prepared, and the coatings were coated on the surface of quartz glass by spin coating. The results show that with the increase of the content of nano-ATO, the heat insulation effect is obviously enhanced; there is a difference of about 10℃ between the nano-ATO coating sample and the blank sample.

SAT NANO can supply ATO powder and dispersion 10-20nm particle, if you have any enquiry, please feel free to contact us at admin@satnano.com