Boron doped diamond thin films on large area Ti6Al4V substrates for electrochemical application

Abstract

Boron doped diamond thin films were grown on titanium alloy substrates (Ti6Al4V) with 36 × 35 × 1.3 mm at 873-933 K at 6.5 × 10³ Pa during 8 h by hot filament CVD assisted technique. The boron source was obtained from a H2 line forced to pass through a bubbler containing B2O3 dissolved in methanol (BC = 6000 ppm). The films were grown on both sides of perforated and non-perforated substrates. Emphasis for diamond growing on perforated substrates have been done in order to increase the active surface area and hereafter to promote an easier electrolyte flow for wastewater treatment. The electrode performance was determined by cyclic voltammetry measurements in KCl, KNO3, Na2SO4, HCl, HNO3 and H2SO4 solutions and the reversibility behavior of the Fe(CN)6(3-/4-) at the Ti6Al4V/Diamond electrode were studied. Also, Scaning Electron Microcopy and Raman Scattering Spectroscopy were used for morphology and diamond quality evaluation, respectively

Enhanced capacitance of composite TiO2nanotube/boron-doped diamond electrodes studied by impedance spectroscopy

“…Therefore, in the case of the TiO 2 /BDD system, an increase in the measured current obviously results from the presence of titania nanotubes that served as a substrate for BDD growth; the extended BDD surface has contact with an electrolyte as has been observed for other porous substrates. 55,56 A clear difference between the TiO 2 /BDD layers obtained at various [B]/[C] ratios in the gas phase was also observed. According to previous studies in which the electrical and electrochemical properties of BDD layers with different [B]/[C] ratios were studied 57,58 an increase in boron concentration resulted in the higher conductivity of samples, and therefore in the enhanced capacitance current.…”

Compositional and Electrochemical Characterization of Noble Metal−Diamondlike Carbon Nanocomposite Thin Films

“…Films grown at lower temperatures contain hydrogen and graphite impurities. Furthermore, considerable thermal expansion mismatch between diamond and most substrate materials leads to poor adhesion. − …”

Synthesis, characterisation and application of an exfoliated graphite–diamond composite electrode in the electrochemical degradation of trichloroethylene

“…28 The sharp peak at 1335 cm À1 is also observed for boron doped diamond powder. 29,30 Therefore it can be concluded that the sharp peak corresponds to the transversal mode of diamond relating to sp 3 bond. 31 Shroder et al 32 also studied Raman analysis of composite structure in diamond thin lms and found that upon increase of diamond concentration (1.5-60%) in diamond-graphite composite, resulted in high intensity peak of diamond while the graphitic peak practically disappeared at 50% diamond concentration.…”