Electrochemical performances of B doped and undoped diamond-like carbon (DLC) films deposited by femtosecond pulsed laser ablation for heavy metal detection using square wave anodic stripping voltammetric (SWASV) technique

Abstract : Pure diamond-like carbon (DLC) thin films and boron-doped DLC thin films have been deposited on silicon substrates using femtosecond pulsed laser. The amorphous carbon materials (DLC), have been deposited at room temperature by ablating graphite targets with an amplified Ti:sapphire laser of 800 nm wavelength and a pulse duration of 150 fs in high vacuum conditions. Doping with boron has been performed by ablating alternatively graphite and boron targets. In this study, the DLC films were used as working electrodes for the electrochemical detection of trace heavy metals namely, Cd(2+), Pb(2+), Ni(2+) and Hg(2+), by using square wave anodic stripping voltammetry (SWASV) technique. Four metals were detected at -1.3 V deposition potential, and 90s deposition time. The DLC films have been characterized by multiwavelength Raman spectrometry and high resolution scanning electron microscopy. The effect of the boron doping on the electrochemical behavior has been shown. The a-C:B 8%/Si(3)N(4) electrode gives the more sensitive detection. The four metals are detected simultaneously with a detection limit of 1 mu g/L or 2 mu g/L and a dynamic range from 1 or 2 to 25 mu g/L for every metal, as presented in third table of this article. The different sensitivities obtained are 6.2, 20.0, 1.2 and 6.6 mu A/ppb or mu A mu g(-1) L for Cd(2+), Pb(2+), Ni(2+) and Hg(2+), respectively.
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Sensors and Actuators B: Chemical, Elsevier, 2011, 155 (1), pp.120-125. 〈10.1016/j.snb.2010.11.034〉
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Soumis le : mercredi 30 octobre 2013 - 09:45:06
Dernière modification le : mercredi 25 juillet 2018 - 14:05:31

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Basma Khadro, A. Sikora, A.-S. Loir, Abdelhamid Errachid, F. Garrelie, et al.. Electrochemical performances of B doped and undoped diamond-like carbon (DLC) films deposited by femtosecond pulsed laser ablation for heavy metal detection using square wave anodic stripping voltammetric (SWASV) technique. Sensors and Actuators B: Chemical, Elsevier, 2011, 155 (1), pp.120-125. 〈10.1016/j.snb.2010.11.034〉. 〈hal-00878426〉

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