**5. Conclusions**

The ultrasonic spray pyrolysis process simultaneously utilizes the advantages of the bottom-up, liquid-phase, and gas phase methods. It involves the steps of placing the desired raw material in a solvent to prepare a solution, generating fine droplets using

an ultrasonic generator, and passing through a high-temperature heating furnace to synthesize particles within seconds via thermal decomposition. Since the process uses a solution by adding a desired metal salt, it is possible to uniformly distribute the material of the desired composition in a single particle. Furthermore, it is an advantageous process for synthesizing particles of complex structures that are difficult to synthesize top-down in one-pot through only process control of fine metal composite particles.

In this chapter, the process of synthesizing Ag and Cu particles, which are mainly used as electrodes, with glass, one of the electrode components, and the process of synthesizing silver-coated copper powder are summarized. All the composite electrode powders showed the advantage of synthesis in the same process as the electrode powder manufacturing process without a coating layer, and all of the samples showed superior electrical properties and atmospheric stability compared to bare powders.

From the results presented in this chapter, it can be inferred that the ultrasonic spray pyrolysis process can be used to synthesize not only single metals, but also various types of composite metal powders utilizing differences in density and melting point.
