Fig. 4.

A The scheme of the AuNSs@SiO2-based probe for “lighting up” detection of miRNA-21. Reprinted with permission from ref. [55], Copyright 2021 American Chemical Society. B Schematic representation of the nanogap antennas assembly for target miRNA detection. Reprinted with permission from ref. [56], Copyright 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. C The scheme of multiplexed SERS detection of microcystins with aptamer-driven core-satellite assemblies. Reprinted with permission from ref. [57], Copyright 2021 American Chemical Society. D The scheme of the synthesis process of CoFe2O4@HNTs/AuNPs composites. Reprinted with permission from ref. [58], Copyright 2020 American Chemical Society