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A) CVs, B) DPVs and C) SWVs of Ag-citrate/GQDs nano-ink fabricated on the surface of apple-skin incubated at 60 °C in the absence and presence of 1mM trifluralin. Supporting electrolyte is 0.1M PBS (pH = 7.4) in the presence of acetone, D) Photographic image of electrochemical sensor made by direct writing of nano-ink on the surface of apple-skin.
