Conventional conductive silver inks are often used for conductive printing of thin film switches and thin film circuits. However, in the face of the printing of electronic products with higher transmission speeds and higher performance requirements, common silver inks have large defects in both conductivity and reliability and cannot meet the higher requirements for inks of these electronic products. Of course, we can choose silver nano ink to complete this task, but if the product does not have ultra-fine printing requirements, rush to use silver nano ink to print, from the perspective of business management is inappropriate. The reason is that this means that the use of raw materials with excess performance, which is often referred to as "big horse carts," is an unnecessary waste. In response, a new product has been developed that uses a small amount of silver nanoparticles to modify metallic silver powder (flakes or spheres) and produces a so-called hybrid silver ink. This product is suitable for the printing of electronic products with high conductivity, high reliability and no special fine requirements. Table 3 lists the composition of the ink and its characteristics.
In a mixed silver ink, the total silver content has a large influence on the conductivity of the ink, and experiments have shown that the silver content is preferably 80% to 95% in the solid component of the ink. If the content of silver is too small, the conductivity of the ink is insufficient; conversely, if the amount of silver is too large, the conductivity of the ink may be impaired for other reasons (see FIG. 3).
As can be seen from Figure 3, when the silver content is 85%, the ink volume resistance is within 10 × 10-6 Ω cm, and when the silver content is increased to 90%, the volume resistance is reduced to the minimum, that is, 6 × 10-6 Ω cm. After this, as the amount of silver in the ink increases, its volume resistance not only does not decrease, but gradually increases. The reason for this can be explained as follows: When the increase in the amount of silver in the ink reaches a maximum, in other words, the percentage of resin binder (binder) has reached a minimum. At this time, the further reduction of the resin content (silver content continues to increase), the uniformity of the ink film during the drying of the ink film will be a problem, that is, the internal of the ink film gradually produces some small cracks, which hinders the electrons inside the ink film. successfully passed.
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