From electrocardiogram monitoring of smart bracelets to neural signal acquisition of brain computer interfaces, from continuous blood glucose monitoring to deep brain stimulation - the commonality of these technologies is that they all require an electrode to act as a "translator" between electronic systems and biological tissues.

Wearable health monitoring devices are transforming from consumer grade to medical grade. But this transformation faces a key threshold - electrode performance. Electrode is the "first gateway" for collecting bioelectric signals, and its performance directly determines the quality and reliability of physiological signals such as electrocardiogram and electromyography. The amplitude of electrocardiogram signals is only in the millivolt range, and EEG signals are even in the microvolt range - if the impedance of the electrode skin interface is too high, weak signals will be drowned out by noise.

In the manufacturing chain of flexible electrodes, the coating process - depositing functional metal layers on the surface of flexible polymer substrates - is a key link that determines the conductivity, biocompatibility, corrosion resistance, and mechanical compatibility of the electrodes. Choosing which precious metal to use as the coating material is the first and most important engineering decision faced by engineers.

2、 Comparison of Material Properties of Three Precious Metals: Gold, Platinum, and Silver

The core performance of precious metal flexible electrodes is rooted in the intrinsic characteristics of the coated metal. Gold, platinum, and silver each have their own emphasis:

3、 From Materials to Devices: The Triple Challenge of Coating Technology

Transforming the intrinsic advantages of precious metals into reliable electrode products relies on precise control of the core coating process. Biomedical electrodes, whether they are surface electrodes or implantable electrodes, have extremely strict comprehensive requirements for conductive coating layers.

4、 Advanced Institute Technology's Coating Technology Platform

Advanced Institute (Shenzhen) Technology Co., Ltd. was established in 2016, headquartered in Bao'an District, Shenzhen. It has an independently registered trademark "Research Platinum" and has dual production bases in Shenzhen and Dongguan. It has passed ISO9001 quality management system certification and its products comply with GJB 773A aerospace standards and RoHS environmental requirements.

In the field of coating technology, the company has independently built magnetron sputtering and vacuum evaporation production lines, using roll to roll continuous production technology, which can achieve efficient, continuous, and uniform deposition of metal layers on the surface of flexible polymer films. Suitable substrates include various flexible materials such as FEP, PI, PET, LCP, PPS, PEN, PP, as well as elastic materials such as PDMS and TPU. Metal plating includes a full range of metals such as gold, silver, copper, aluminum, tin, nickel, titanium, platinum, etc. Relying on PVD technology, the company has achieved precise nanoscale control of metal thin films on the surface of substrates, with a thickness that can be controlled between a few nanometers to several hundred nanometers.

5、 Typical application scenarios and selection suggestions

6、 Conclusion

The essence of precious metal flexible electrodes is an engineering solution that combines the intrinsic physical properties of precious metals such as gold, platinum, silver - high conductivity, chemical inertness, biocompatibility - with the mechanical compatibility of flexible polymer substrates. Gold provides the "gold standard" of chemical inertness and low impedance, platinum provides the "platinum quality" of electrocatalytic activity and long-term stability, and silver provides the "silver grade option" of optimal conductivity and cost advantage.

There is no absolute 'best' among the three, only 'most suitable'. Understanding the differences in material properties of different precious metals, the technical boundaries of different coating processes, and the performance priorities of different application scenarios - these are the key to upgrading precious metal flexible electrodes from "one coating solution" to "engineering decision-making". In the era of rapid iteration of wearable medical, neural interface, and biosensing technologies, precious metal flexible electrodes are becoming the core "translator" connecting the electronic world with living organisms.