Brief introduction
Gold conductor pasteIt has a wide range of applications in various fields such as the electronics industry, among which the performance of gold powder plays a key role in the conductivity of gold conductor paste. Among various types of gold powder,super-fine powdered goldGradually gaining attention. This article will explore in depth the advantages of the conductivity of ultrafine gold powder in gold conductor paste compared to ordinary gold powder, referring to the relevant research results of Advanced Institute (Shenzhen) Technology Co., Ltd., and combining with the relevant data of research platinum YB8113 gold conductor paste and other products for analysis.
2、 The basic principle of gold conductor paste and the importance of gold powder
Gold conductor paste is a special material formed by dispersing gold powder in an organic carrier. After curing under certain conditions, gold powders come into contact with each other to form a conductive path. The particle size, shape, purity, and other factors of gold powder will affect the final conductivity of the gold conductor paste.
3、 Comparison of Characteristics between Ultra fine Gold Powder and Ordinary Gold Powder
- Particle size difference
- The particle size of ordinary gold powder is usually larger, for example, its average particle size may be around 5-10 μ m.
- And ultrafine gold powder, such asAdvanced Institute (Shenzhen) Technology Co., LtdThe ultrafine gold powder studied has an average particle size of 0.1-1 μ m.
- Difference in specific surface area
- According to experimental data, ordinary gold powder has a relatively small specific surface area due to its large particle size. Taking a certain brand of ordinary gold powder as an example, its specific surface area is about 1-2m ²/g.
- The specific surface area of ultrafine gold powder is significantly larger. The ultrafine gold powder of Advanced Institute (Shenzhen) Technology Co., Ltd. has a specific surface area of 5-10m ²/g.
4、 Comparative experiment and data on conductivity performance
- experimental design
- Prepare two sets of gold conductor slurries, one using ordinary gold powder (commonly available in the market), and the other using ultrafine gold powder.
- Under the same process conditions, two sets of gold conductor paste are printed on the same substrate material to produce conductive lines of the same size.
- Use a four probe tester to measure the resistivity of conductive lines.
- experimental procedure
- Firstly, mix the gold powder with other raw materials (such as binders, solvents, etc.) in a certain proportion and stir evenly using a ball mill.
- Next, use screen printing technology to evenly apply the slurry onto silicon wafers or ceramic substrates.
- Finally, place the printed sample in an oven and heat it to a specific temperature to solidify, ensuring a good conductive connection between the gold powders.
- experimental result
- Prepared from ordinary gold powderGold conductor pasteThe electrical resistivity is relatively high. At room temperature (25 ° C), after multiple measurements and taking the average value, its resistivity is approximately 2 × 10 Ω· m.
- The resistivity of the gold conductor slurry prepared using ultrafine gold powder is significantly lower. Under the same measurement conditions, its resistivity is approximately 1 × 10 ⁻⁶Ω· m.
- In addition, the gold conductor paste prepared from ultrafine gold powder also exhibits higher conductivity (about 4 × 10 ⁷ S/m) and charge mobility (about 2 × 10 ⁻³ cm ²/V · s).
5、 Analysis of the Reasons for the Advantages of Conductive Properties of Ultra fine Gold Powder
- Increased contact area
- Due to the small particle size and large specific surface area of ultrafine gold powder, there are more contact points between ultrafine gold powders in the gold conductor slurry. According to theoretical calculations, at the same volume fraction, the contact area between ultrafine gold powders can be increased by 30% -50% compared to ordinary gold powders. More contact area is beneficial for electron transfer, thereby reducing resistivity and improving conductivity.
- Experimental data shows that the slurry prepared from ultrafine gold powder has a tighter contact between gold powder particles in the microstructure after solidification, forming more effective conductive paths.
- Better dispersion
- The dispersibility of ultrafine gold powder in organic carriers is better than that of ordinary gold powder. Ordinary gold powder is prone to agglomeration, resulting in uneven distribution in the gold conductor paste. And ultrafine gold powder can be more evenly dispersed in the slurry, making the conductive path more continuous. Through scanning electron microscopy (SEM) observation, it was found that the distribution of gold powder in the gold conductor slurry using ultrafine gold powder was more uniform, with almost no obvious agglomeration areas.
- Further experiments have shown that the uniform distribution of ultrafine gold powder in the slurry significantly improves the stability and consistency of the conductive network.
6、 Conclusion
In summary, ultrafine gold powder isGold conductor pasteThe conductivity of gold powder has significant advantages compared to ordinary gold powder. From experimental data, it can be seen that the gold conductor slurry prepared from ultrafine gold powder not only has lower resistivity, but also higher conductivity and charge mobility. This is mainly due to the small particle size and large specific surface area of ultrafine gold powder, which allows it to have more contact area and better dispersion in the gold conductor slurry. The achievements of Advanced Institute (Shenzhen) Technology Co., Ltd. in the research of ultrafine gold powder and the broad application prospects of research platinum YB8113 and other products will help further improve the performance of gold conductor paste in the fields of electronics and promote the development of related industries.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.
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