“…In this paper, we offer a novel and industrially demanding approach for the synthesis of nickel nanoparticles in the bulk level using a green-based sol–gel auto combustion process, which is an extension of our earlier work related to the novel synthesis of silver 45 and ferrite 46 nanoparticles. In this study, pure lemon juice is adopted as a green medium and reducing agent for the sol–gel synthesis of NNP, which can effectively replace all other conventional reducing agents.…”