Fig. 2.

A The scheme of colorimetric analysis of DNA sequence based on disulfide-induced self-assembly. Reprinted with permission from ref. [25], Copyright 2019 American Chemical Society. B The schematic of specific AuNPs in several kinds of salts solution and the corresponding absorbance. Reprinted with permission from ref. [26], Copyright 2018 American Chemical Society. C The scheme of the competitive cortisol analysis using PlexNanoCuves. Reprinted with permission from ref. [27], Copyright 2018 Elsevier B.V. All rights reserved. D Schematic illustration of the dual-modality immunosensor construction. Reprinted with permission from ref. [28], Copyright 2019 American Chemical Society