Eastmanetal was created to prevent nanoparticle aggregation. A one-step physical vapour condensation technique was used to generate Cu/ethylene glycol nanofluids. The one-step procedure entails simultaneously synthesizing and dispersing nanoparticles in the fluid. This technique eliminates the processes of nanoparticle drying, storage, transportation, and dispersion, which lowers nanoparticle agglomeration and enhances fluid stability. The one-step processes can create nanoparticles that are equally dispersed and stable in the base fluid. The vacuum-SANSS method is another successful method for creating nanofluids from different dielectric liquid fluids (submerged arc nanoparticle synthesis system). The thermal conductivity properties of dielectric liquids influence and determine several diagnostic approaches. The morphologies of the nanoparticles formed are needle-like, polygonal, square, and round. Particle agglomeration is avoided using this strategy. The one-step chemical approach is rapidly emerging due to the one-step physical method's inability to generate nanofluids in large numbers and at a cheap cost. By reducing CuSO45H2O in ethylene glycol with NaH2PO2H2O while microwave irradiation, Zhu et al. revealed a new one-step chemical technique for generating copper nanofluids. Copper nanofluids are produced that are well-dispersed and stable in suspension. Mineral oil-based nanofluids containing silver nanoparticles with a narrow size distribution have also been created using this method. Korantin might stabilize the particles by forming a thick coating surrounding them by coordinating to the silver particle surfaces through two oxygen atoms. For over a month, the silver nanoparticle suspensions remained steady. To make stable ethanol-based nanofluids containing silver nanoparticles, a microwave-assisted one-step technique might be applied. In the method, polyvinylpyrrolidone (PVP) was utilized as a colloidal silver stabilizer and reducing agent. Silver nanoparticles engage with ODA molecules in the organic phase by either coordination bond formation or weak covalent interaction, resulting in a phase change. A phase transfer approach has been developed for producing homogeneous and stable graphene oxide colloids. Graphene oxide nanosheets (GONs) were successfully transported from water to n-octane after being modified by oleylamine, and a schematic depiction of the phase transfer process was generated. The one-step strategy, on the other hand, has substantial disadvantages. The fact that residual reactants persist in the nanofluids as a result of incomplete reaction or stabilization is the most important factor. Without eliminating the influence of impurities, it is impossible to understand the nanoparticle impact.