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. 2021 May 7;15(5):8753–8760. doi: 10.1021/acsnano.1c01001

Figure 1.

Figure 1

Chiral nematic composite films with different PBG assembled from CNCs and SB. (a) Transmission spectra of CNC/SB films showing the PBG overlap with the absorption of SB solution (gray line) for CNC/SB-1 and CNC/SB-2, and a clear PBG for the CNC/SB-3 film centered at 562 nm. The PBGs obtained from SEM data are displayed in the gray area for CNC/SB-1, red area for CNC/SB-2, and blue area for CNC/SB-3, respectively. The dashed line indicates the PBG average wavelength value. The fluorescent spectrum (dark yellow line) of SB aqueous solution (0.001 wt %) displaying an emission peak at 444 nm. (b) Transmission spectra of CNC/SB-3 film probed by L-CP, R-CP, and unpolarized light. (c–e) SEM images of CNC/SB-1, CNC/SB-2, and CNC/SB-3 samples, exhibiting periodical, layered order with different helix pitch and corresponding different reflective colors (insets, the scale bar is 1 cm). The images are taken in the vertical cross-section. (f–h) POM images of CNC/SB-1, CNC/SB-2, and CNC/SB-3 films obtained in reflection mode showing varied birefringence and planar textures (the crossed arrows indicate the axes of the analyzer and polarizer, respectively).