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(a) Schematic illustration of the concentration-dependent effects of AP and APP on the aspect ratio of AuNRs. Adapted with permission from ref 35. Copyright 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. (b) Illustration of a sandwich immunoassay based on the surface etching of the Au nanostars. Reproduced with permission from ref 37. Copyright 2021 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
