Diamond depositions were prepared through microwave plasma enhanced chemical vapor deposition (MPCVD) technique using a homemade cylindrical shape metal reactor. Growth conditions with
pressure and power of 10 mbar and 550 W, respectively, were used to reach a temperature on the substrate holder of 500 °C. The precursor gas mixture consists of hydrogen, methane and trimethylboron (TMB) at flow rates of 100, 1 and 12 sccm, respectively