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. 2021 Apr 28;13(9):1423. doi: 10.3390/polym13091423

Figure 2.

Figure 2

(a) Vis-NIR spectra and photographs of CuPAN and S-CuPAN and (b) Raman spectra of CuPAN, L-CuPAN, S-CuPAN, and LS-CuPAN.