In terms of thermal properties, nano SnO2 can be attributed to an ATO raw material, and its heat insulation mechanism:
The SnO2 crystal has a regular tetrahedral rutile structure, and the anion coordination number is 6∶3. Each tin ion is adjacent to 6 oxygen ions, and each oxygen ion is adjacent to 3 tin ions. After antimony doped ions in SnO2, occupy the position of the lattice Sn4 +, forming a positive charge one price center SbSn and an extra valence electrons, increase net electronic, the formation of n – type semiconductor, grain conductivity increases, which results the SnO2 and doped powder after membrane while maintaining the high visible light transmittance, shows similar to the conductivity of the metal performance and fine properties such as high infrared reflectivity. And because ATO is an n-type semiconductor, according to the classical Drude theory, ATO nanoparticles with the best electrical conductivity have the best infrared shielding performance.
He qiuxing et al. proposed that the thermal insulation of ATO particles is based on their absorption of infrared light. According to huang baoyuan et al. ‘s long-term thermal insulation effect test and spectral performance characterization, ATO particles are mainly absorbed and supplemented by reflection in the infrared region. Qu et al. believe that the thermal insulation mechanism of ATO nano transparent thermal insulation coating is that when the solar radiation reaches the coating surface, most of the near-infrared light and a small part of the visible light are absorbed, so that the surface temperature of the coating increases. At the same time, most visible light and very little near-infrared light will enter the room through the coating, so that the indoor temperature can be reduced while still maintaining a good transmittance in the visible region. In addition, due to its low emissivity in the far-infrared region, the coating can effectively prevent heat loss in the room when it is used in the solar terms dominated by heating or in winter.
Application of cosmetics: as doping material, the nano SnO2 powder has the characteristics of anti-infrared and anti-ultraviolet by taking advantage of the infrared reflection performance of nano SnO2 powder and combining the characteristics of ultraviolet light absorbed by nano TiO2 powder, and the nano SnO2 powder doped with TiO2 has the characteristics of anti-infrared and anti-ultraviolet, so that the cosmetics made can play a better role in protecting the skin.
Description of electrical properties:
Nano SnO2 is a typical n-type semiconductor, with Eg= 3.5ev (300K), which is characterized by large surface ratio, high activity, low melting point and good thermal conductivity. It is widely used in gas-sensitive materials, electricity, catalysts, ceramics and cosmetics.
SnO2 is a kind of semiconductor gas-sensitive material widely used at present. It is a sintered resistive gas-sensitive element made of ordinary SnO2 powder, which has high sensitivity to a variety of reducing gases. However, the stability and consistency of the device are not satisfactory. SnO2 nano powder can be used as glaze and enamel opacifier in the ceramic industry. In terms of electricity, antistatic agents show great advantages over other antistatic materials, and have great advantages in photoelectric display, transparent electrode, solar cell, liquid crystal display and catalysis.
In addition, nanometer tin dioxide composite is also a hot spot in development. In the process of preparing SnO2 material, a small amount of dopant is added to improve its selectivity and reduce the resistivity.
