Fig. 8.
a) Schematic diagram of the DNA detection by hydrogel-IOs, DNA-responsive hydrogel IOs (bright-field microscopic images) and the optical response of the DNA-responsive hydrogel photonic beads incubated in their corresponding target DNA with different concentrations; b) GNPs-assembled SiO2 IOs film and 2D AgNS-coated IOs. The SERS spectra of the 2D AgNS-coated IOs treated with different concentrations of ssDNA solutions. Copyright 2010, John Wiley and Sons. Reproduced from Ref. [131]. Copyright 2012, Royal Society of Chemistry. Reproduced from Ref. [149]. EB: Ethidium bromide, FRET: Fluorescence resonance energy transfer, Fl: fluorescein, PC: Photonic crystal, DNA: Deoxyribonucleic acid, IO: Inverse opal, MBs: Molecular beacons, TiO2: Titanium oxide, SEM: Scanning electron microscopy, GNPs: Gold nanoparticles, AgNS: Silver nanosheet, SERS: Surface enhanced Raman spectroscopy, ssDNA: single strand DNA. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)