Copper is the element of the D block. However, these particles have a round shape, and they appear in brown to black powder. These particles are highly flammable solids. The experts advise keeping away these copper nanoparticles from the aquatic life because of their toxic nature. These particles are also anti-microbial and anti-biotic agent when they are added with plastics and textiles. These copper nanoparticles are high strength metals and alloys. They are awell-known heat sink and thermally conductive materials at large scale. These particles are used in the synthesis of methanol and glycol. Apart from this, these nanoparticles are conductive and used in coating processing of metal and non-ferrous metal. In the same manner, these are used as sintering additives and the capacitor material. The most famous application of these copper nanoparticles is the EMI shielding. So, it can be said that copper nanoparticles have a wide variety of applications in several fields.