Abstract
The viability of using polycrystalline, boron-doped diamond thin-film electrodes for the amperometric detection of ferrocyanide, ferricyanide, ethylamine, and ethylenediamine has been investigated for the first time. These redox reactions were studied by cyclic voltammetry, hydrodynamic voltammetry, and flow injection analysis with electrochemical detection (FIA-EC) at films without any prior surface pretreatment. The diamond films, 1−5 μm thick, were grown on conducting Si substrates at a dopant level of ∼1019 boron atoms/cm3. The detector performance was evaluated as a function of the linear dynamic range, sensitivity, limit of detection, response variability, and response stability. The results indicate that diamond films produce analytically useful responses for all these analytes in both the scanning and constant potential modes. Noteworthy are the observations that boron-doped diamond (i) can be used as a substrate for the detection of both oxidation and reduction reactions (e.g., ferro- and ferricy...
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