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Characterization of boron-doped diamond electrodes prepared under the different conditions.

Rok: 2015

Druh publikace: ostatní - článek ve sborníku

Název zdroje: Studentská odborná konference Chemie je život 2015: sborník příspěvků

Název nakladatele: Vysoké učení technické v Brně

Místo vydání: Brno

Strana od-do: 91

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Characterization of boron-doped diamond electrodes prepared under the different conditions.	The pure diamond is distinguished by outstanding mechanical and chemical stability and it is one of the best natural insulators. For its electrochemical utilization, it needs to be doped with atoms of other elements, most often with boron. Diamond films are created by chemical vapor deposition (CVD) with heated filaments (HF) or microwave heating. The mixture of methane and hydrogen is usually used for diamond film deposition and diborane or trimethylboron are added into the mixture for boron doping process. Silicon served most commonly as a substrate for the diamond films. Boron-doped diamond electrode (BDDE) corresponds with the concept of green analytical chemistry. It is known to be a remarkable material due to its particularly attractive properties combining high thermal stability, thermal conductivity, chemical resistance, optical transparency and stable background current. Working surface of these electrodes has a paraffinic character, so low adsorption on the surface is observed during electroanalytical measurements; the problems with passivation are minimized. The wide potential window about 3 V is the greatest advantage of BDDEs. In this work, chemical, physical and electrochemical properties of boron-doped diamond electrodes prepared by heated filaments chemical vapor deposition (HF CVD) under the different conditions have been examined. The content of CH4 in H2 was changed in the interval of 0.5-2 % and the B/C ratio in the gas phase was in the range of 0-20000 ppm. Scanning electron microscopy (SEM) and Raman spectroscopy were used for surface characterization of BDD films. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) of the redox system [Fe(CN)6]3−/4− were used for electrochemical characterization of prepared electrodes. Finally, all BDDEs in combination with differential pulse voltammetry (DPV) were tested for substituted urea herbicide linuron (LIN) determination under the optimized experimental conditions.	Boron-doped diamond electrode; Raman spectroscopy; Scanning electron microscopy; Cyclic voltammetry; Electrochemical impedance spectroscopy; Linuron

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