UV-visible and cyclic voltammetry study on hydrogenated diamond-like carbon

Hydrogenated diamond-like carbon (HDLC) thin film was synthesized using reactive gas plasma produced in a capacitively coupled plasma system onto silicon (100) wafer substrates. These thin films were extracted by boiling with cyclohexane under reflux in round bottom flux. The photophysical character of the extracted solution was studied by using a UV-Visible spectrometer. A reversible nature of the absorbance was observed in the extracted films solution with respect to over a temperature range from 20-80 0C. Cyclic voltametry experiment was run in the potential range -1.0-1.0 with scan rates (100 mVs-1) using redox couple [Fe(CN)6]4-/[Fe(CN)6]3- in an unperturbed 1mM ferricyanide solution in 0.1M H2SO4 solution. HDLC thin film substrate was used as the working electrode, a Silver wire was worked as a reference electrode and Pt wire as a counter electrode. It is seen that the potential difference between anode and cathode peaks is 0.449 V which referred that our HDLC’s surface act as an irreversible electrode that is it can donate as well as accept an electron.