UNESCO Laboratory of Environmental Electrochemistry Charles University in Prague Heyrovský Institute AS CR
BORON DOPED DIAMOND FILM ELECTRODES - AN EXCELENT TOOL FOR VOLTAMMETRIC MONITORING OF ENVIRONMENTALLY IMPORTANT ORGANIC SUBSTANCES Jiri Barek UNESCO Laboratory of Environmental Electrochemistry, Department of Analytical Chemistry, Charles University, Prague, Czech Republic, e-mail: Barek@natur.cuni.cz
Why new electrode materials Broader potential window Lower noise and background current Resistance toward passivation Mechanical stability Compatibility with „green analytical chemistry“
WHY BORON DOPED DIAMOND FILM ELECTRODES Low noise Broad potential windows Low passivation Mechanical and electrochemical stability Biocompatibility Comercial availability
Properties of diamond sp 3 allotropic modification of carbon Hardness Low chemical reactivity Insulant doping by boron Low double layer capacity Broad potential window Low adsorption Stability, biocompatibility Properties of boron doped diamond Boron doped diamond film electrodes
The potential window of BDD electrode, BR buffer pH 2 - 12
CVD - Chemical Vapor Deposition Mechanism is not fully understood as yet Radicals and other reactive species are formed in the mixture of methane and hydrogen. They diffuse to the surface of growing diamond layer. They react at the surface and deposits in the form of diamond. High hydrogen atom concentration prevents the formation of sp 2 carbon species. Boron doping from solid (boron nitride) or gaseous (boranes,B 2 H 6 ) sources
CVD - Chemical Vapor Deposition Boron doped diamond film electrode
Boron doped diamond film electrode (BDDFE) Legend 1.Electrode body 2.Screw contact 3.Screw attachment 4.Small metal spring 5.Brassy sheet 6.DFE on Si (1,1,1) 7.Silicone seal 8.Access for solution Surface of nanocrystalline diamond film electrode on Si
BDDFE Glass tube (1), copper wire (2), conductive epoxide resin (3), non-conductive epoxide resin (4), silica wafer covered with BDDF (5), diameter of BDDFE (d, 3 mm), surface of BDDFE (A, 7,1 mm 2 ).
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