Fig. 6. (a) Schematic depiction of a structurally colored hydrogel aptasensor for the detection of heavy metal ions. Reproduced with permission.95 Copyright 2012, Royal Society of Chemistry. (b) Preparation of a structurally colored porous thermosensitive hydrogel using a colloidal amorphous array. Reproduced with permission.103 Copyright 2015, Wiley-VCH. (c) Schematic illustration of the fabrication of a spectrometer grating and the optical image of the obtained grating film with a black pane. Reproduced with permission.100 Copyright 2014, American Chemical Society. (d) Schematic diagram of the system structure and principle of the structural color filter with a regulated filter band. Reproduced with permission.101 Copyright 2013, Royal Society of Chemistry. (d) Preparation of a structurally colored porous thermosensitive hydrogel using a colloidal amorphous array. Reproduced with permission.103 Copyright 2015, Wiley-VCH.
