Research Article Eemi Nieminen, Aalto University School of Chemical Technology, FINLAND Search for more papers by this author Lasse Murtomaki, PDF ShareShare Abstract Reduction and nanoparticle nucleation of Cu$^{2+}$ by decamethylferrocene was studied with cyclic and square-wave voltammetry at a microscale liquid--liquid interface established at the tip of a micropipette. With square-wave voltammetry, two reduction steps could be distinguished as two separate current waves.