Thermoelectrics are gaining more attention to develop and improve their size, fabrication, and application. Among the many processes that can be employed to fabricate the thermoelectric materials, up to date, it has been rare to apply the atmospheric pressure plasma jet (APPJ). Atmospheric pressure plasma jet (APPJ) is a type of non-thermal plasma. APPJ is more effective than vacuum because atmospheric plasma does not require specific space, unlike chamber reactions. Surface treatments and modifications such as surface wettability, surface cleaning, surface etching, surface coating, and so on are permissible. According to the APPJ, the APPJ was used in this study to deposition metallic layers by dissolving precursors and connecting them to the plasma head. It carried the precursor's droplet deposited onto the alumina surface by using Ar + 2%H2 as a gas source and Ar as a carrier gas with two kind scanning time, 150 times and 180 times. Initially, the plasma properties of the APPJ that deposited the metallic (Ag, Cu, Ni) layers were investigated using a K-type thermocouple to measure the plasma gas temperature and optical electron spectroscopy to observe the reactive species. The crystal structure was observed using an X-ray diffractionmeter, the morphology and element distribution were observed using field- scanning emission microscopy, and the thickness was observed using optical microscopy. Furthermore, the electrical characteristics were examined using a 4-point probe to detect conductivity and resistivity, and an additional exsisting method for testing the thermoelectric generator. The temperature’s result is shown by introducing the precursor into the system, increasing the temperature of plasma gas. The result shows that using APPJ has successfully deposited porous metallic layers of Ag, Cu, and Ni. Moreover, by depositing a metallic layer onto alumina, it becomes more conductive. However, future work intends to study the electricity, we haven’t succeeded in generating electricity by applying a different temperature as the principle of a thermoelectric generator.

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