Fig. 2.

a TEM images of the as-synthesized AuNSs with different LSPR peaks as labelled in each image. The last image indicates the existence of a very thin layer of PEI on the surface of AuNSs after surface modification with (indicated by two parallel lines), while the inset shows the TEM image of bare AuNS. b Schematic illustration of the AuNS@AIE-PS formation via electrostatic interaction. c Spectral overlap between the extinction spectra of different AuNSs (solid lines) and fluorescence spectra of AIE-PS dot (dashed line). d Solution colours of the as-synthesized AuNSs with LSPR peak at 540, 585, 668, 718, and 762 nm (left to right), respectively, under room light