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Chronoamperomogram (50 s) for a carbon fibre microelectrode (r=4.8 μm) immersed in 20 mm sodium nitrate and 0.25 % w/v alumina powder (0.05 μm) measured at +0.6 V versus a mercury/mercurous sulfate reference electrode (MSE): containing no nanoparticles (black); containing 100 pm of citrate-capped silver nanoparticles (red). Inset: A close-up of individual signals observed.
