A spectroelectrochemical study on perylenecation radical in polymer microchannel-microelectrode chips
Literature Information
Kosei Ueno, Noboru Kitamura
Polymer microchannel chips (depth 20 µm and width 100 µm) integrated with band electrodes were fabricated by photolithography and imprinting methods, and applied to a spectroelectrochemical study on the cation radical of perylene (Pe). A propylene carbonate solution of Pe was brought into the channel chip by pressure driven flow and Pe was oxidized at the working band electrode (WE) in the channel. Simultaneously, absorption measurements of the solution phase in the downstream side of the electrode (30 µm from WE) were conducted on the basis of space resolved spectroscopy. The decrease in the absorbance of Pe at 438 nm upon electrolysis accompanied an appearance of the absorption band around 538 nm, which was assigned to that of the Pe cation radical. When the perylene solution was introduced to the microchip at a slow flow velocity, the dimer cation radical of Pe was shown to be produced in the channel chip. The formation and disappearance processes of the monomer and dimer cation radicals of Pe in the channel were followed by flow velocity and position dependencies of the absorption spectra.
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