Abstract
The electrochemical properties of diamond are very sensitive to the surface terminations. It is still a challenge to successfully produce well-defined “C–O” functions. In this paper, we describe and compare the oxidation of as-grown polycrystalline boron-doped diamond (BDD) films using four different oxidizing agents in aqueous media: Ce 4+, MnO 4 −, H 2O 2 and S 2O 8 2−. The different treatments lead to the formation of oxygenated functions at the diamond surface, mainly singly oxidized “C–O” groups such as “C–OH” or “C–O–C”. Processes with Ce 4+ and MnO 4 − seem to be particularly interesting as they both lead to the creation of a high amount of oxygenated functions and an improvement of the charge transfer at BDD surfaces.
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