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Colloidal Ga NPs synthesis. Step 1: about 300 nm of AZO expendable layer deposition on silicon substrate; Step 2: Ga NPs evaporation on the AZO layer; Step 3: the expendable layer is etched until NPs almost detached from the surface; Step 4: by means of ultrasound treatment, the NPs are transfer into the solution; Step 5: extraction of the substrate from the as-synthetized colloidal solution.
