Research / 2022 / Article / Fig 4

Research Article

Mechanically Reinforced Silkworm Silk Fiber by Hot Stretching

Figure 4

Polarized Raman spectroscopy analysis of HSSFs: (a, b) Raman spectra of silk fibers recorded when silk fibers aligned perpendicular (gray curves) or parallel (colored curves) to the polarization direction of the laser beam; (c, d) an example showing the fitting results of 1229 cm−1 and 1665 cm−1. The insets show the relative direction of the corresponding chemical bonds to the fiber axis; (e, f) intensity ratios of different silk fibers.