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. 2018 Jul 5;8(7):496. doi: 10.3390/nano8070496

Figure 2.

Figure 2

UV-Vis spectra of gold nanoparticles S1, (A); S2 (B); S3 (C); S4 (D); and S5 (E) obtained using cacao extract. Absorption spectra of samples recorded at 30 min, 1, 2, 3, 4, and 24 h from the initiation of AuNPs synthesis at 100 °C. Insets displaying the AuNPs solution before (i) and after (ii) synthesis.