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SEM image of printed AuNP ink on carbon electrodes showing the pattering of the particles. (a) SEM characterisation shows well-defined patterning of the AuNP ink in a printed honeycomb pattern on carbon electrodes, at low magnification (30×). Higher magnification images (b) 20, (c) 50 and (d) 100 kx show the even distribution of the AuNPs on the surface.
