Dispersion And Application Of Conductive Nano-particles

Permanent conductive particles include metals, non-metallics and oxide semiconductors. Commonly used metals such as elemental metal, alloy etc; non-metal such as graphite, carbon black, etc; oxide semiconductors such as Antimony doped tin oxide, Indium tin oxide, Aluminum doped zinc oxide, etc.The metal particles show good conductivity, but the particles are difficult to disperse and easily oxidized. The advantages of carbon black are permanent conductive and cheap, but it is deep in color and the processing is very difficult. With the rapid development of electronic and information technology, display technology, and solar photovoltaic technologies, transparent conductive materials are developed very fast, especially ATO and ITO. ITO has the highest conductivity and visible light transmittance, but the indium is costly and the price is not stable.ATO powder has the advantages, such as cheap raw materials, high electrical conductivity, excellent thermal stability, chemical stability, and mechanical stability. The key to the nanoparticle application is the powder agglomeration and the dispersion of nanoparticles is of great importance.In this paper, we studied the dispersion and application of ATO and carbon black conductive nanoparticles.Firstly, we studied the dispersion of ATO. We chose water, ethanol, PMA, and PDO as solvent, respectively, and obtained the most suitable dispersants.Secondly, we studied the parameters for the ATO dispersion, such as pH, milling time, ratio of dispersant to ATO powder. We obtained the steady conductive powder slurry, and explored the methods to reach higher solid content.Thirdly, we used insulation devices and resistance apparatus to test the performances of the nanoparticle slurries. The results show that the insulation effect of ATO slurry is 5℃, and the resistance of the polymer decreased to 106Ωm-2.Finally, we dispersed conductive carbon black such as BP2000 and XC-72R.We obtained stable carbon black slurry. Test results show that the resistance of the PTFE coating decreased to 106Ωm-2 when carbon black conductive particles are added.