 Copper nanoparticles have become increasingly popular in recent years due to their potential applications in printed electronics. However, their use is limited by their tendency to oxidize in ambient conditions. Several methods have been developed to coat copper nanoparticles with protective layers to prevent this from happening, including organic polymers, alkene chains, amorphous carbon, graphene, and inorganic materials like silica and metals. These coatings allow for the formation of high-conductivity patterns when used in conjunction with inkjet printing techniques. The use of copper nanoparticles in printed electronics opens up new possibilities, such as the production of RFID tags, solar cells, and electro-luminescent devices. This article was authored by Shlomo Magdasi, Alexander Kamyshny, and Michael Grouchko.