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    Polyethyleneimine Functionalized Graphene Oxide: A Promising Inhibitor for Corrosion of Copper in the Hydrochloric Acid Environment. Ahmad Quraishi Mumtaz,Singh Chauhan Dheeraj,Rahmani Ansari Kashif,Madhan Kumar Arumugam,Saleh Tawfik Abdo Journal of nanoscience and nanotechnology Polyethyleneimine functionalized graphene oxide (PEI-GO) was prepared and characterized for its molecular structure and morphology. The PEI-GO is, for the first time, reported as an inhibitor against copper (Cu) corrosion in 0.5 M HCl using electrochemical studies. PEI-GO acts as a promising corrosion inhibitor for Cu with 92.24% efficiency at 100 mgL. The PDP studies reveal a mixed type of inhibitor behavior of PEI-GO with cathodic prevalence. Cyclic voltammetry revealed the inhibition influence of PEI-GO on the redox process of Cu corrosion. SEM and FTIR-ATR studies showed the creation of a protective layer on the Cu substrate. DFT studies revealed that the PEIGO exhibits better reactivity compared to parent PEI, and Monte Carlo simulations showed higher adsorption energy for PEI-GO on the Cu surface compared to the PEI. 10.1166/jnn.2021.19308