Abstract
Abstract A novel procedure to prepare sol–gel graphite composite electrodes is presented. This procedure uses the surfactant bis(2-ethylhexyl) sulfosuccinate (AOT) and eliminates the need for a cosolvent, an acidic catalyst, a cellulose binder and thermal curing. Cobalt phthalocyanine (CoPC), diphenylthiocarbazone (DPT) and glucose oxidase (GOx)/ferrocene (Fc) were encapsulated during the surface preparation to study the utility of these composites as catalytic surfaces and biochemical sensors. The glucose sensor has a useful working range up to 30 mM with a 10 s response time. The DPT-modified electrode has been applied for lead determination based on a complexing/voltammetric strategy. The CoPC modified surface was catalytically active for reduced glutathione (GSH) reducing the onset potential for its oxidation by 400 mV. Fabrication of screen-printed electrodes by this method proved to be a simple approach for electroanalytical applications in aqueous and nonaqueous solvents.
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