Fig. 6.

a) SEM image of the conventional peptide nanotube (inset shows higher surface magnification) [84]. b) Optical absorption map of FF-based peptide nanotubes and FF [84]. c) SEM image of FF base peptide nanotubes (left), AFM image of the corresponding peptide quantum dots (right) [87]. d) Optical absorption spectrum of the FF peptide nanotubes (black line) and the FF peptide QDs (red curve) [87]. e) Schematic illustration of oriented crystallization over a long-range in self-assembling fibrous peptide networks [91]. f) PL image of platelets excited at 330–380 nm [91]. g) Schematic diagram of the preparation of biomolecule-based microspheres [95]. h) Confocal image of microspheres showing autofluorescence [95].