Boron-doped diamond thin-film

Couto et al. [11] developed a flow injection system with potentiometric detection for determination of TC, OTC, and CTC in pharmaceutical products. A homogeneous crystalline CuS/Ag2S double membrane tubular electrode was used to monitor the Cu(II) decrease due to its complexation with OTC. The system allows OTC determination within a 49.1 1.9 x 103 ppm and a precision better than 0.4%. A flow injection method for the assay of OTC, TC, and CTC in pharmaceutical formulations was also developed by Wangfuengkanagul et al. [12] using electrochemical detection at anodized boron-doped diamond thin-film electrode. The detection limit was found to be 10 nM (signal-to-noise ratio = 3). 

Wangfuengkanagul and Chailapakul [9] described the electroanalysis of ( -penicillamine at a boron-doped diamond thin film (BDD) electrode using cyclic voltammetry. The BDD electrode exhibited a well-resolved and irreversible oxidation voltammogram, and provided a linear dynamic range from 0.5 to 10 mM with a detection limit of 25 pM in voltammetric measurement. In addition, penicillamine has been studied by hydrodynamic voltammetry and flow injection analysis with amperometric detection using the BDD electrode. 

J. Stotter, J. Zak, Z. Behier, Y. Show, G.M. Swain, Optical and electrochemical properties of optically transparent, boron-doped diamond thin films deposited on quartz, Anal. Chem., vol. 74, p.5924, 2002. 

Okino P, Shibata H, Kawasaki S, Touhara H, Momota K, Nishitani-Gamo M, Sakaguchi I, Ando T (1999) Electrochemical fluorination of 1, 4-difluorobenzene using boron-doped diamond thin-film electrodes. Electochem Solid-State Lett 2 382-384... 

Michaud, P.-A., Panizza, M., Ouattara, L., Diaco, T., Foti, G. and ComnineUis, Ch. (2003) Electrochemical oxidation of water on synthetic boron-doped diamond thin film anodes. J. Appl. Electrochem. 33,151-154. 

Mcgaw, E. A. and Swain, G. M. (2006), A comparison of boron-doped diamond thin-film and hg-coated glassy carbon electrodes for anodic stripping voltammetric determination of heavy metal ions in aqueous media. Anal. Chim. Acta, 575(2) 180-189. 

Marselli B. Electrochemical oxygen transfer reaction on synthetic boron-doped-diamond thin film electrode, PhD thesis no. 3057, EPFL (Ecole Polytechnique Federale de Lausanne) (2004). 

Michaud, P.-A., Mahe, E., Haenni, W., Perret, A. and Comninellis, Ch. (2000) Preparation of per-oxodisulfuric acid using boron-doped diamond thin film electrodes. Electrochem. Solid-State Lett. 3, 77-79. 

Serrano, K., Michaud, P.A., Comninellis, Ch. and Savall, A. (2002) Electrochemical preparation of peroxodisulfuric acid using boron doped diamond thin film electrodes. Electrochim. Acta 48, 431 136. 

Michaud P-A, Mahe E, Haenni W, Perret A, CominelUs C. (2000). Preparation of peroxidi-sulfuric acid using boron-doped diamond thin film electrodes. Electrochemical and Solid-State Letters 3(2) 77-79. 

Zhao J, Wu L, Zhi J (2009) Non-Enzymatic Glucose Detection Uusing As-Prepared Boron-Doped Diamond Thin-Film Electrodes, analyst 134 794-799. 

The names for these two film types arise from their nominal crystallite size and morphology. Figure 5 shows scanning electron microscopy (SEM) images of the two types of boron-doped diamond thin film deposited on Si. High quality microcrystalline diamond films are deposited from CH4/H2 source gas mixtures with volumetric ratios of 0.3 to 1.0%,... 

Figure 17 shows cyclic voltammetric i-i curves for 1 and 25 pM horse heart cytochrome c in 50 mM NaCl -l- Tris HCl buffer, pH 7.2, at a boron-doped diamond thin film deposited on quartz. No faradaic response can be seen above the background for the 1 pM concentration but a well-defined, peaks-shaped response is seen for the 25 pM solution. At this can rate (0.1 V/s), the AFp is ca. 100 mV and is ca. 0.50 pA. The Zp /z ratio is near 1... 

Cyclic voltammetric measurements were made using well-characterized microcrystalline, boron-doped diamond thin-film electrodes to test the material s responsiveness for ferrocene as a function of scan rate, solvent. 

Importantly, these analytes can be quantitatively electrooxidized at boron-doped diamond thin-film electrodes without derivatization, the use of pulsed voltammetiic waveforms as is most often required for detection at metal electrodes like gold, or fouling [36,39,43,110]. Boron-doped diamond electrodes possess the requisite physicochemical properties needed to support the amine oxidation via an anodic oxygen-transfer reaction (e.g., surface boron sites for amine coordination and localized sp carbon sites where the oxidant, OH , is generated at lower overpotential than the surrounding diamond matrix), and these properties can... 

The subscripts ND and B refer to nondiamond carbon and boron, respectively. Boron-doped diamond thin-film electrodes possess several properties important for anodic oxygen-transfer reactions. First, high-quahty diamond films are stable and resistant to corrosion in strongly acidic and alkaline media. Therefore, at the anodic potentials used to detect the polyamines, the electrode structure is stable. Second, films may contain sp -bonded nondiamond carbon impurity distributed very locally over the surface. These impurities can exist at the grain boundaries or as extended defects within the diamond film. These surface impurities, which... 

Conductive sp -bonded diamond is being developed as an advanced catalyst support material. Boron-doped diamond thin-film electrodes possess excellent properties for this application, such as electrical conductivity, chemical inertness, extreme corrosion resistance, and dimensional stability. Compared with more commonly used sp -bonded carbon materials, diamond is highly resistant to electrochemical corrosion. For exam-... 

Figure 25-28 shows an experimental cyclic volt-ammogram of the Fe(CN) -Fe(CN), couple at a boron-doped diamond thin-film electrode compared to a cyclic voltammogram simulated by DigiSim. Note the... 

Wang J, Swain GM, Tachibana T, Kobashi K. Incorporation of Pt particles in boron doped diamond thin films applications in electrocatalysis. Electrochem SoUd-State Lett 2000 3 286-9. 

Conductive boron-doped diamond thin-film electrodes Single stream manifold, consisting in a peristaltic pump, an injector with internal loop and two Pt electrodes connected to a PC by serial or parallel interface card Polytoluidine blue (PTB) film is chemically modified on glassy carbon (GC) electrode by cyclic voltammetry in 0.1 M H3PO4 buffer... 

Granger, M. and Swain, G. 1999. The influence of surface interactions on the reversibility of ferri/ ferrocyanide at boron-doped diamond thin-film electrodes. J. Electrochem. Soc. 146 4551 558. 

Wang and coworkers have also separated and detected three different groups of pollutants (nitrophenols, aromatic amines, and chlorophenols) by capillary electrophoresis on a glass microchip with amperometric detectimi using river and ground-water samples. In this case, the detected compounds were previously added. Five nitrophenol derivates were detected in 120 s with a glassy carbon electrode, three aromatic amines (4-aminophenol, 2-aminonaphthalene, and o-aminobenzoic acid) in 150 s with a boron-doped diamond thin-film detector,and phenol and three... 

Preparation and Characterization of Poly crystalline Chemical Vapor Deposited Boron-doped Diamond Thin Films... 

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