“…This process is commonly known as the solvent‐free diazonium reaction. In this methodology, the diazonium salts are in situ generated from a reaction between amines and nitrosonium ions; additionally, these ions can be substituted by NaNO 2 and H + source (such as sulfuric, acetic, hydrochloric, or hypochloric acid) . The aryl layers resulting from the reduction of diazonium salts have been widely employed for the coupling of molecules, macromolecules, polymers, nanoparticles, and nanotubes for different applications .…”