Conductive inks are a recent progress in electronics and have a promising future applications in flexible electronics and smart applications. In this review we tried to focus on a particular conductive ink, based on copper nanoparticles. Although wide research is being done all over the world, few complications are yet to be solved with perfection. We tried to focus on some of the complications involved in the synthesis and their various applications in the different fields of science. Conductive inks have promising applications in the present trend of science and technology. The main intention behind this review is to list out some of the best methods to synthesize copper nanoparticles according the category of synthesizing them. We chose copper nanoparticles synthesis and preparation of conductive inks because copper is a very abundant material possessing high conductivity (after silver), it has huge potential to replace expensive conductive inks made of silver, graphene, CNTs etc. The reason behind insisting on copper is also due to its properties such as ductility, malleability, thermal dissipation agent, possess anti microbial nature etc. In this review, we have listed out some of the best methods of synthesizing copper conductive ink and their usage in various printing techniques. Different methods of sintering for obtained conductive patterns are also included.

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