High reactivity and stability of diamond electrodes: The influence of the B‐doping concentration

The use of diamond to develop electrochemical (EC) sensors opens up promising perspectives with interests for biosensing applications. However, in spite of the superior EC properties of diamond, two crucial issues remain to be solved: to improve (i) the electrode stability and (ii) the charge transfer rate k 0 . To address these issues, the influence of the boron concentration and of EC treatments on EC behaviour was assessed. Our results were compared with those obtained on a commercial diamond electrode. The reactivity of the as-grown electrodes was very high whatever the boron concentration. However, a systematic linear increase of the charge transfer resistance (R t ) with time, highly dependent on the boron concentration, was observed. The most favourable EC behaviour was obtained for a boron concentration close to the phase separation limit . and attributed to a higher effective doping. Moreover, a further EC-treatment of the diamond samples considerably enhances the electrodes stability. Optimized samples, obtained after EC-treatment, show a high reactivity (k 0 = 0.2 cm/s) equivalent to that of platinum as well as a remarkably enhanced stability.

[1]  Michael Daenen,et al.  Enhanced diamond nucleation on monodispersed nanocrystalline diamond , 2007 .

[2]  A. Deneuville,et al.  Highly and heavily boron doped diamond films , 2007 .

[3]  Milos Nesladek,et al.  Stability of H‐terminated BDD electrodes: an insight into the influence of the surface preparation , 2007 .

[4]  A. Deneuville,et al.  Specific features of 325 nm Raman excitation of heavily boron doped polycrystalline diamond films , 2006 .

[5]  D. Becker,et al.  The impedance of fast charge transfer reactions on boron doped diamond electrodes , 2003 .

[6]  Giacomo Cerisola,et al.  Application of diamond electrodes to electrochemical processes , 2005 .

[7]  P. Bergonzo,et al.  Electrochemical diamond sensors for TNT detection in water , 2009 .

[8]  C. Lévy‐Clément,et al.  Effect of boron concentration on the electrochemical reduction of nitrates on polycrystalline diamond electrodes , 2000 .

[9]  J. Jorcin,et al.  CPE analysis by local electrochemical impedance spectroscopy , 2006 .

[10]  A. Deneuville,et al.  Characteristics of homoepitaxial heavily boron-doped diamond films from their Raman spectra , 2000 .

[11]  Su-Moon Park,et al.  Peer Reviewed: Electrochemical Impedance Spectroscopy for Better Electrochemical Measurements , 2003 .

[12]  S. Compton,et al.  Stripping Analysis using Boron-Doped Diamond Electrodes , 2008 .

[13]  M. D. Krotova,et al.  Photoelectrochemical properties of semiconductor diamond , 1987 .

[14]  O. Chailapakul,et al.  Boron-Doped Diamond-Based Sensors: A Review , 2006 .

[15]  Richard S. Nicholson,et al.  Theory and Application of Cyclic Voltammetry for Measurement of Electrode Reaction Kinetics. , 1965 .

[16]  J. Foord,et al.  Electrochemically controlled modification of CVD diamond surfaces , 2004 .

[17]  Christos Comninellis,et al.  Boron doped diamond electrodes for nitrate elimination in concentrated wastewater , 2003 .

[18]  J. Randles,et al.  A cathode ray polarograph. Part II.—The current-voltage curves , 1948 .

[19]  M. Iwaki,et al.  Electrical conductivity of nitrogen and argon implanted diamond , 1983 .

[20]  Hiroshi Uetsuka,et al.  Diamond and biology , 2007, Journal of The Royal Society Interface.

[21]  C. Comninellis,et al.  Electrochemical reactivity at graphitic micro-domains on polycrystalline boron doped diamond thin-films electrodes , 2005 .