Electrodeposition of Metal Adlayers on Boron‐Doped Diamond Thin‐Film Electrodes

Abstract

A preliminary investigation of the electrochemical deposition of Pt, Pb, and Hg adlayers on conductive diamond thin-film surfaces has been made using cyclic voltammetry and scanning electron microscopy. The diamond thin films employed were polycrystalline, grown on conductive Si substrates (1 cm 2) to a thickness of ca. 14 i~m, and doped with boron at a nominal atomic concentration ranging between 10 ~9 and 102~ cm -3. The cyclic volammetric measurements were performed both in a conventional glass electrochemical cell and in a thin-layer flow cell. The results demonstrate that metaUization of diamond film surfaces electrochemically is feasible, opening the door for the development of novel catalytic electrodes, sensors, and detectors using this advanced material.

Simultaneous Electrochemical Detection and Determination of Lead and Copper at Boron-Doped Diamond Film Electrodes

“…A current crossover is therefore observed. Such voltammetric behavior is characteristic of a nucleation and growth mechanism [39,40] in which the initial formation of Pb nuclei on the diamond surface at À 0.70 V serves to increase the rate of further deposition. Thus on the return scan the cathodic current flows at less negative potentials than those required to initiate deposition.…”

Growth of Pt clusters electrodeposited onto boron-doped diamond films

“…Unfortunately, an accurate evaluation of the electrochemically active area of Pt is difficult because under a repetitive potential cycling between 0 and 1.4 V/ NHE, a progressive decrease of the characteristic Pt peaks occurs as previously reported [8]. Nevertheless, the amount of Pt deposited onto SiBDD and its growth can be roughly followed by using the macroscopic information obtained by cyclic voltammetry.…”

“…Nevertheless, our approach, in which Pt is mainly used for testing the surface of diamond, is quite different from the incorporation by DC-sputtering of Pt and Pt/Ru particles into BDD thin films to obtain promising materials needed in electro-catalytic applications [7]. The metallic deposits of Pt anchored into the diamond matrix present good stability under long-term potential cycling while this is not the case for Pt simply electrodeposited on the diamond surface [8]. (Siltronix, 10 mm in diameter, <0.1 V cm).…”

A Study of the Determination of Cu(II) by Anodic Stripping Voltammetry on a Novel Nylon/Carbon Fiber Electrode

“…In this case, the electrode was kept in the cathodic region long enough to further promote electrolytic accumulation of copper before the anodic scan. Moreover, a crossover was observed at À 0.4 V between the currents registered during scanning in the anodic and cathodic direction; this voltammetric behavior is characteristic of a metal deposition mechanism described by nucleation and growth, in which the initial formation of copper nuclei on the electrode surface increases the rate of further deposition [25,26]. The cyclic voltammogram also indicated a pronounced positive shift of the hydrogen evolution overpotential in the reverse negative scan with respect to the forward positive scan.…”