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. 2018 Apr 26;18(5):1338. doi: 10.3390/s18051338

Figure 4.

Figure 4

(a) Raman spectra of raw MWNTs and m-MWNTs; (b) Fourier transform infrared (FTIR) spectra of pure PU, raw MWNT/PU composite and m-MWNT/PU composite.