The conductivity is 108S/m, which is better than copper and silver in carbon based conductor paste

In addition to using metals and metal oxides as conductive fillers, commonly used ones include Carbon based conductive fillerIncluding carbon black, graphite, carbon fiber, carbon nanotubes, etc. With the continuous development of printed electronics, new carbon based conductive fillers have gradually become a new research and application hotspot, among which carbon nanotubes and graphene are two ideal high-quality fillers.

The carbon nanotube wall is based on a carbon hexagonal ring as the basic skeleton, with an aspect ratio of over 1000, and has good conductivity and mechanical properties, making it easy to build conductive pathways; Graphene is a two-dimensional nanomaterial with a single atomic layer, which has high mechanical strength and excellent electrical and thermal conductivity. Its conductivity is 108S/m, which is better than copper and silver metals. Carbon nanotubes and graphene, as new carbon based conductive fillers, have great potential for development and good application prospects. However, their dispersibility and stability still need to be improved. At the same time, due to their high cost, new carbon based slurries have not yet been mass-produced and applied on a large scale.

Aluminum based conductor paste， The advantages of Al conductor are its low price and stable electrical performance. Al and Si are prone to form barrier contacts and are commonly used as materials for the back field of Si solar cells. Al has good ohmic contact characteristics with PTC thermistor ceramics, so Al conductors are also used as electrode materials for PTC thermistors. But the main disadvantage of Al conductors is their low resistance to impact currents. Under the action of a large surge current, arcing is prone to occur at the contact point of the electrode, and in severe cases, the electrode may be burned. Therefore, a layer of Ag electrode is often burned and infiltrated on the Al electrode as a secondary protection measure.

Nickel based conductor paste， The conductivity of Ni conductor is worse than that of Cu, and its weldability is also poor. Mainly used as electrodes for plasma displays. Replacing Ag conductors with Ni conductors can overcome the severe sputtering phenomenon of Ag electrodes on plasma display panels, greatly extending the lifespan of plasma display panels. Due to its low cost, moderate resistance, stable TCR value, and high temperature creep resistance, nickel alloy slurry has gradually replaced silver palladium slurry and become a specialized heating slurry for electronic Yan thick film atomization cores.