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a Selective fabrication of p- and n-type thermoelectric micropatterns via the reduction of CuO–NiO mixed NPs using femtosecond laser pulses. (Reproduced with permission from Ref. [83]. Copyright Springer, 2017). b Schematic of the nano-recycling process flow, with optical photographs corresponding to each stage of nano-recycling (Figures reproduced with permission from Ref. [85]. Copyright Wiley–VCH, 2015)
