Fig. 2
Copyright 2020, American Chemical Society. b The formation of nanotubes from amino acids precursors. c High-resolution SEM image of tryptophan nanotubes. Reprinted with permission from Ref. [52], Copyright 2017, Springer
Design and synthesis of 1D peptide nanofibers and nanotubes: a Phg4 peptide self-assembled into a schematic diagram of nanofiber network. Reprinted with permission from Ref. [46],