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In situ absorption spectra of methylene blue (MB) adsorbed on an indium-tin-oxide electrode were observed by slab optical waveguide (SOWG) spectroscopy. The absorption spectrum of the MB obtained by the SOWG spectroscopy coincided with that by conventional spectroscopy for the solution phase, and the MB existed as dimer at 0 V vs. Ag/AgCl. Upon the electrode potential of cathodic condition, the absorption...
Direct electron transfer between surface-immobilized cytochrome c and an indium-tin-oxide (ITO) electrode was investigated using ITO slab optical waveguide (SOWG) spectroscopy. The peak position of the absorption band of cytochrome c immobilized on the ITO electrode changed repeatedly between 409 and 414 nm with the electrode potential sweep, which corresponded to the oxidized and reduced forms of...
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