Preparation and characterization of boron doped diamond electrodes on diamond anvil for in situ electrical measurements under high pressure

A layer of boron doped diamond (BDD) film was deposited selectively on a diamond anvil and employed as electrodes for measuring the electrical resistivity of matter under high pressure. Both heavily doped and lightly doped electrodes were characterized by Raman spectroscopy and scanning electron microscopy. Though the BDD film electrodes contain sp2 carbon, it is still suitable for in situ high pressure electrical measurements. The dependability of diamond film electrodes was tested at high pressure up to 36 GPa, by measuring the electric resistance of C60 fullerene powder, and no damage of the electrodes was observed.

Research Highlights
► We introduce a method of fabricating boron doped diamond electrodes on diamond anvil for in situ electrical measurements under high pressure.
► Depending on Raman spectroscopy, sp2 carbon was observed in the boron doped diamond electrodes.
► Scanning electron microscopy studies indicate that the electrodes are polycrystalline boron doped diamond film.
► The dependability of diamond film electrodes was tested at high pressure up to 36 GPa, by measuring the electrical resistance of pressure-induced superhard phase of C60.