Abstract
An array of micro/nanoelectrodes offers most of the advantages of single micro/nanoelectrodes, but with the added benefit of a higher total current output and increasing sensitivity. This work reports the analytical performance of a gold electrode modified with a Mn(III) porphyrin nanobar-film (NBMn-PPh) employed for the sensitive determination of Ascorbic Acid (AA) at pH = 7.4 in the presence of always coexistence interferences Dopamine (DA) and Uric Acid (UA).
Highlights
Microelectrode arrays demonstrated an attractive behavior relate to macroelectrodes, as they can produce voltammetric responses of similar magnitude to their macro counterparts, but with a considerably less capacitive/background current
The diffusion to ensembles of microelectrodes has been well described in the literature, using both analytical and simulation techniques [29,30,31], and the proposed assumptions can be applied to our case
The small spacing between individual nanoelectrodes and packing of active electrode sites may result in overlapping of diffusion zones and the resultant planar diffusion to Randomly Array Nanobar Electrodes (RANBEs) to improve the signal-to-noise ratio
Summary
Microelectrode arrays demonstrated an attractive behavior relate to macroelectrodes, as they can produce voltammetric responses of similar magnitude to their macro counterparts, but with a considerably less capacitive/background current They have found an increasing use in electroanalytical sensing devices. Some researches were focused on designing new types of sensing-arrays that employed micro/nanoelectrodes in both regular and random distributions [1,2]. These structures, due to their many advantageous properties, including low background charging currents, large current density related to convergent diffusion and importantly small diffusion path between each adjacent microelectrode elements, are routinely used in analytical applications [3]. The resulting serum sample was analyzed by the proposed sensor for the AA detection, using the spiked amounts and the standard addition method
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